The document discusses reinforced cement concrete (RCC), including its history, materials, specifications, and advantages/disadvantages. RCC uses steel reinforcement embedded in concrete to resist tensile, shear, and sometimes compressive stresses. François Coignet is considered a pioneer of RCC, building the first reinforced concrete structure in 1853. Proper proportions and mixing of cement, aggregates like sand and gravel, and water are needed to produce durable concrete. Precast concrete involves casting pieces off-site then transporting them for assembly.
This document discusses various causes and effects of dampness in buildings and methods of damp proofing. It covers:
1. The main causes of dampness are moisture rising up from the ground, rain penetrating wall tops and external walls, and condensation.
2. Effects of dampness include unhealthy conditions, damage to structures and decorations, and deterioration of electrical fittings.
3. Methods of damp proofing include using a damp proof course (DPC), integral damp proofing of concrete, surface treatments, cavity wall construction, guniting, and pressure grouting.
4. Suitable materials for DPC include bitumen, mastic asphalt, metal sheets, cement concrete, and
Guniting is a process that uses a cement-sand mixture projected at high pressure through a cement gun to repair damaged concrete surfaces. The mixture, usually in a 1:3 cement to sand ratio, is deposited on the surface under 20-30 N/cm^2 of pressure. Guniting can be used on vertical, overhead, and horizontal surfaces to restore concrete damaged by corrosion or inferior work. It provides an impervious layer and high compressive strength of 56-70 N/mm^2.
This document provides information on grouting and guniting processes. It defines grouting as placing a cementitious material into cavities to improve load capacity or repair structures. Grouting mixtures are described along with categories, properties, specifications and applications. Guniting is introduced as a technique using pneumatic application of cementitious mortar to rehabilitate structures like bridges and buildings. The document outlines equipment, procedures and processes for mixing, pumping and applying grouts and shotcrete.
This document provides specifications for different classes of buildings and roads. It defines specifications as describing the nature, materials, and workmanship for a construction project. Building specifications are classified as general or brief (covering foundation, walls, roofing, etc. for different classes) and detailed. It provides the general specifications for various components like foundation, walls, roofing, flooring and finishing for first, second, third and fourth class buildings. Road specifications include details for subgrade, soiling, intercoat, topcoat, brick edging and considerations for heavy traffic or weak subgrade.
Stabilized mud block (SMB) or pressed earth block is a building material made primarily from damp soil compressed at high pressure to form blocks. If the blocks are stabilized with a chemical binder such as Portland cement they are called compressed stabilized earth block (CSEB) or stabilized earth block (SEB).
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Shoring is the construction of a temporary structure to support an unsafe or unstable structure. There are three main types of shoring: raking shores, flying shores, and dead shores. Raking shores use inclined members called rakers to provide lateral support to walls. Flying shores provide temporary support between party walls when an intermediate building is demolished. Dead shores provide vertical support to walls and structures when the lower part of a wall is removed, such as to add an opening.
This document discusses prefabrication in construction. Prefabrication involves assembling components of a structure in a factory then transporting them to the construction site. It has advantages like reduced cost, time, and waste and allows work during poor weather. Common prefabricated components include columns, beams, waffle floors/roofs which are cast and cured off-site then erected using cranes. While prefabrication offers benefits, it also has disadvantages like potential breakage during transport and need for specialized equipment and labor. The document concludes that partial prefabrication is well-suited for Indian conditions.
This document discusses various causes and effects of dampness in buildings and methods of damp proofing. It covers:
1. The main causes of dampness are moisture rising up from the ground, rain penetrating wall tops and external walls, and condensation.
2. Effects of dampness include unhealthy conditions, damage to structures and decorations, and deterioration of electrical fittings.
3. Methods of damp proofing include using a damp proof course (DPC), integral damp proofing of concrete, surface treatments, cavity wall construction, guniting, and pressure grouting.
4. Suitable materials for DPC include bitumen, mastic asphalt, metal sheets, cement concrete, and
Guniting is a process that uses a cement-sand mixture projected at high pressure through a cement gun to repair damaged concrete surfaces. The mixture, usually in a 1:3 cement to sand ratio, is deposited on the surface under 20-30 N/cm^2 of pressure. Guniting can be used on vertical, overhead, and horizontal surfaces to restore concrete damaged by corrosion or inferior work. It provides an impervious layer and high compressive strength of 56-70 N/mm^2.
This document provides information on grouting and guniting processes. It defines grouting as placing a cementitious material into cavities to improve load capacity or repair structures. Grouting mixtures are described along with categories, properties, specifications and applications. Guniting is introduced as a technique using pneumatic application of cementitious mortar to rehabilitate structures like bridges and buildings. The document outlines equipment, procedures and processes for mixing, pumping and applying grouts and shotcrete.
This document provides specifications for different classes of buildings and roads. It defines specifications as describing the nature, materials, and workmanship for a construction project. Building specifications are classified as general or brief (covering foundation, walls, roofing, etc. for different classes) and detailed. It provides the general specifications for various components like foundation, walls, roofing, flooring and finishing for first, second, third and fourth class buildings. Road specifications include details for subgrade, soiling, intercoat, topcoat, brick edging and considerations for heavy traffic or weak subgrade.
Stabilized mud block (SMB) or pressed earth block is a building material made primarily from damp soil compressed at high pressure to form blocks. If the blocks are stabilized with a chemical binder such as Portland cement they are called compressed stabilized earth block (CSEB) or stabilized earth block (SEB).
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Shoring is the construction of a temporary structure to support an unsafe or unstable structure. There are three main types of shoring: raking shores, flying shores, and dead shores. Raking shores use inclined members called rakers to provide lateral support to walls. Flying shores provide temporary support between party walls when an intermediate building is demolished. Dead shores provide vertical support to walls and structures when the lower part of a wall is removed, such as to add an opening.
This document discusses prefabrication in construction. Prefabrication involves assembling components of a structure in a factory then transporting them to the construction site. It has advantages like reduced cost, time, and waste and allows work during poor weather. Common prefabricated components include columns, beams, waffle floors/roofs which are cast and cured off-site then erected using cranes. While prefabrication offers benefits, it also has disadvantages like potential breakage during transport and need for specialized equipment and labor. The document concludes that partial prefabrication is well-suited for Indian conditions.
This document discusses causes, effects, and methods of preventing dampness in buildings. It outlines several precautions that should be taken such as proper site drainage and wall thickness. Common causes of dampness include rising moisture, rain penetration, and poor drainage. Effects include breeding mosquitoes and damage to building materials. Methods of damp proofing discussed are damp proof courses, waterproof surface treatments, integral treatments during construction, cavity walls, and cement grouting of cracks. Specific materials used for damp proof courses like bitumen and mastic asphalt are also outlined.
Ferrocement is a thin reinforced concrete material made of closely spaced wire mesh and mortar. It was developed in the 1940s and provides several advantages over traditional reinforced concrete. Ferrocement structures can be constructed with minimal formwork and skilled labor since the wire mesh reinforcement is embedded throughout the thin mortar surface. Common applications include water tanks, boats, housing elements, and agricultural structures due to its lightweight, durability, and flexibility in shaping.
Prestressed concrete is concrete that is placed under compression using tensioned steel strands, cables, or bars. This is done through either pre-tensioning or post-tensioning. In pre-tensioning, the steel components are tensioned before the concrete is poured, while in post-tensioning, the steel components are tensioned after the concrete has hardened. Prestressed concrete provides benefits over reinforced concrete like lower construction costs, thinner structural elements, and longer spans between supports.
Concrete is a composite material made by binding aggregates with a cement paste. It comes in various types depending on the binding material (cement or lime) and purpose (plain, reinforced, pre-stressed). Good concrete has strength, durability, density, water tightness, workability and resistance to wear and tear. Proper mixing, placing, compaction and curing are required to develop these qualities in concrete.
Ferrocement is a thin reinforced concrete made of cement mortar and wire mesh. It is strong, durable, and low-cost. Common applications include walls, floors, roofs, water tanks, bridges, and marine structures. Ferrocement is 2-5 cm thick and has a cement mortar mix reinforced with steel mesh or rods. It was invented in the 1850s and methods of construction include skeletal armature, closed mould, integral mould, and open mould. Ferrocement is used Residential buildings, marine applications, water and sanitation infrastructure, agriculture, renewable energy, and other structures.
This document discusses various methods for repairing distressed concrete structures, including:
- Guniting, which involves pneumatically projecting cement and aggregates onto surfaces.
- Shortcreting, where mortar or concrete is projected onto surfaces to repair cracks or strengthen existing concrete.
- Crack repair techniques like stitching, routing and sealing, and resin injection.
- Shoring and underpinning methods to provide temporary or permanent support to unsafe or sinking structures, such as vertical, inclined, and pit shoring as well as underpinning foundations.
FERROCRETE - MATERIAL AND CONSTRUCTION METHODSjagrutib22
Ferrocrete is a type of reinforced concrete that uses closely spaced wire mesh or small diameter rods infiltrated with mortar. It has high density and durability to withstand various climates. Ferrocrete structures are lighter than regular reinforced concrete and do not require formwork. Some applications of ferrocrete include roofing, water tanks, bridges, and precast building components. Ferrocrete is constructed by first making a wire mesh framework, applying mortar that is worked into the mesh, and compacting it. This produces a strong, lightweight material suitable for many construction applications.
This document provides an overview of concrete, including its composition, properties, production process, and testing. Some key points:
- Concrete is a composite material made of cement, fine and coarse aggregates, and water. It can be classified based on its cementing material, mix proportions, performance specifications, grade, density, and place of casting.
- The production of concrete involves batching, mixing, transporting, placing, compacting, curing, and finishing. Proper batching and mixing are important to ensure uniform strength. Compaction removes entrapped air for maximum strength. Curing maintains moisture for proper hardening.
- Concrete properties depend on water-cement ratio, with maximum theoretical
This document provides an overview of prefabricated modular structures. It discusses the introduction and features of prefabricated structures, comparing them to site-cast structures. It outlines the design concept, components, types of precast systems including large panel, frame, and lift-slab systems. It also discusses design considerations, equipment used, assembly process, scheduling, advantages including reduced costs and time, limitations, and concludes with examples of prefabricated hospital structures.
This document discusses different types of special concretes, including light weight concrete, aerated concrete, and no fines concrete. It provides details on the properties and production methods of these concretes. Light weight concrete has lower density than normal concrete, which provides benefits like reduced structural weight. Aerated concrete is made by introducing air bubbles into cement mortar, creating a lightweight cellular structure. No fines concrete omits fine aggregates, consisting of only cement, coarse aggregates, and water. These special concretes are used for applications requiring specific properties like lower density or higher insulation.
The document provides an introduction to advanced building materials. It discusses how materials are becoming more intelligent, interactive and responsive. It then classifies advanced building materials into intelligent materials that can sense and respond on their own, and interactive materials that require external commands to function. The document lists several material trends and properties of advanced materials, and outlines the aims and scope of studying these materials for sustainable construction. It provides examples of specific advanced materials like aerogel, lotusan paint and others, describing their composition, characteristics and applications.
This document discusses rate analysis and valuation of properties. It provides information on:
1) Rate analysis is determining the cost per unit of work based on material, labor, and other costs. Rates vary by location. Rate analysis is used to determine actual costs, optimize efficiency, and revise rates due to cost changes.
2) Valuation estimates the fair price or value of a property based on type, location, quality, size, and other factors. It is used for buying/selling, taxation, rent calculation, loans, and more. Valuation considers cost, depreciation, income, expenses, and taxes to determine present value.
3) Key terms like market value, scrap value, salv
This document describes the properties of bricks, including their physical, mechanical, and thermal characteristics. It discusses the shape, size, color, density, compressive strength, insulation properties, durability, and frost resistance of standard bricks. It also outlines various tests conducted on bricks, such as those measuring compressive strength and water absorption. Additionally, it defines the qualities of good bricks and provides a classification system for bricks based on their characteristics and intended uses. Special types of bricks are also outlined, including those with modified shapes, perforations, and alternative compositions like sand lime bricks and refractory fire bricks.
Pre-stressed concrete uses tensioned steel strands or bars to place concrete in compression before application of service loads. This counters the tensile stresses induced by loads and prevents cracking. There are two main methods: pre-tensioning applies tension before pouring concrete, while post-tensioning tensions strands after concrete curing. Pre-stressed concrete allows for smaller and lighter structures that resist loads, deflection, and cracking better than reinforced concrete.
The document discusses various types of chemical admixtures used for concrete, including plasticizers, superplasticizers, retarders, accelerators, and air-entraining admixtures. It explains that admixtures can modify the properties of fresh and hardened concrete by altering workability, strength development, permeability, and durability. Superplasticizers in particular are highlighted as they can significantly reduce water content and increase workability and strength. The document concludes that superplasticizers and air-entraining admixtures are most commonly used, and that superplasticizers allow for reduced cement and increased construction of large structures.
Joints are easy to maintain and are less detrimental than uncontrolled or uneven cracks. Concrete expands & shrinks with variations in moisture and temp. The overall affinity is to shrink and this can cause cracking at an early age. Uneven cracks are unpleasant and difficult to maintain but usually do not affect the integrity of concrete.
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This document provides specifications for reinforced cement concrete work. It discusses formwork, reinforcement, and concreting requirements. Formwork must be made of seasoned wood boards at least 30mm thick. Reinforcement bars must meet specifications and be free of rust and contaminants. Concrete proportions and mixing are also specified, with cement to sand to aggregate ratios provided for different mixes. Proper curing and finishing of concrete surfaces is emphasized.
Reinforced cement concrete (RCC) uses steel reinforcement within concrete to improve its tensile strength. Concrete is strong under compression but weak under tension. Steel reinforcement provides high tensile strength due to its high tensile capacity and good bond with concrete. Steel also has a higher elastic modulus, allowing it to resist forces better than concrete alone under the same extension. Cement is a binder that hardens when mixed with water, and can be classified as hydraulic or non-hydraulic. Hydraulic cement can set even when wet or underwater due to additions like fly ash that allow curing in wet conditions. Portland cement is the most common type and consists mainly of tricalcium silicate, dicalcium sil
This document discusses causes, effects, and methods of preventing dampness in buildings. It outlines several precautions that should be taken such as proper site drainage and wall thickness. Common causes of dampness include rising moisture, rain penetration, and poor drainage. Effects include breeding mosquitoes and damage to building materials. Methods of damp proofing discussed are damp proof courses, waterproof surface treatments, integral treatments during construction, cavity walls, and cement grouting of cracks. Specific materials used for damp proof courses like bitumen and mastic asphalt are also outlined.
Ferrocement is a thin reinforced concrete material made of closely spaced wire mesh and mortar. It was developed in the 1940s and provides several advantages over traditional reinforced concrete. Ferrocement structures can be constructed with minimal formwork and skilled labor since the wire mesh reinforcement is embedded throughout the thin mortar surface. Common applications include water tanks, boats, housing elements, and agricultural structures due to its lightweight, durability, and flexibility in shaping.
Prestressed concrete is concrete that is placed under compression using tensioned steel strands, cables, or bars. This is done through either pre-tensioning or post-tensioning. In pre-tensioning, the steel components are tensioned before the concrete is poured, while in post-tensioning, the steel components are tensioned after the concrete has hardened. Prestressed concrete provides benefits over reinforced concrete like lower construction costs, thinner structural elements, and longer spans between supports.
Concrete is a composite material made by binding aggregates with a cement paste. It comes in various types depending on the binding material (cement or lime) and purpose (plain, reinforced, pre-stressed). Good concrete has strength, durability, density, water tightness, workability and resistance to wear and tear. Proper mixing, placing, compaction and curing are required to develop these qualities in concrete.
Ferrocement is a thin reinforced concrete made of cement mortar and wire mesh. It is strong, durable, and low-cost. Common applications include walls, floors, roofs, water tanks, bridges, and marine structures. Ferrocement is 2-5 cm thick and has a cement mortar mix reinforced with steel mesh or rods. It was invented in the 1850s and methods of construction include skeletal armature, closed mould, integral mould, and open mould. Ferrocement is used Residential buildings, marine applications, water and sanitation infrastructure, agriculture, renewable energy, and other structures.
This document discusses various methods for repairing distressed concrete structures, including:
- Guniting, which involves pneumatically projecting cement and aggregates onto surfaces.
- Shortcreting, where mortar or concrete is projected onto surfaces to repair cracks or strengthen existing concrete.
- Crack repair techniques like stitching, routing and sealing, and resin injection.
- Shoring and underpinning methods to provide temporary or permanent support to unsafe or sinking structures, such as vertical, inclined, and pit shoring as well as underpinning foundations.
FERROCRETE - MATERIAL AND CONSTRUCTION METHODSjagrutib22
Ferrocrete is a type of reinforced concrete that uses closely spaced wire mesh or small diameter rods infiltrated with mortar. It has high density and durability to withstand various climates. Ferrocrete structures are lighter than regular reinforced concrete and do not require formwork. Some applications of ferrocrete include roofing, water tanks, bridges, and precast building components. Ferrocrete is constructed by first making a wire mesh framework, applying mortar that is worked into the mesh, and compacting it. This produces a strong, lightweight material suitable for many construction applications.
This document provides an overview of concrete, including its composition, properties, production process, and testing. Some key points:
- Concrete is a composite material made of cement, fine and coarse aggregates, and water. It can be classified based on its cementing material, mix proportions, performance specifications, grade, density, and place of casting.
- The production of concrete involves batching, mixing, transporting, placing, compacting, curing, and finishing. Proper batching and mixing are important to ensure uniform strength. Compaction removes entrapped air for maximum strength. Curing maintains moisture for proper hardening.
- Concrete properties depend on water-cement ratio, with maximum theoretical
This document provides an overview of prefabricated modular structures. It discusses the introduction and features of prefabricated structures, comparing them to site-cast structures. It outlines the design concept, components, types of precast systems including large panel, frame, and lift-slab systems. It also discusses design considerations, equipment used, assembly process, scheduling, advantages including reduced costs and time, limitations, and concludes with examples of prefabricated hospital structures.
This document discusses different types of special concretes, including light weight concrete, aerated concrete, and no fines concrete. It provides details on the properties and production methods of these concretes. Light weight concrete has lower density than normal concrete, which provides benefits like reduced structural weight. Aerated concrete is made by introducing air bubbles into cement mortar, creating a lightweight cellular structure. No fines concrete omits fine aggregates, consisting of only cement, coarse aggregates, and water. These special concretes are used for applications requiring specific properties like lower density or higher insulation.
The document provides an introduction to advanced building materials. It discusses how materials are becoming more intelligent, interactive and responsive. It then classifies advanced building materials into intelligent materials that can sense and respond on their own, and interactive materials that require external commands to function. The document lists several material trends and properties of advanced materials, and outlines the aims and scope of studying these materials for sustainable construction. It provides examples of specific advanced materials like aerogel, lotusan paint and others, describing their composition, characteristics and applications.
This document discusses rate analysis and valuation of properties. It provides information on:
1) Rate analysis is determining the cost per unit of work based on material, labor, and other costs. Rates vary by location. Rate analysis is used to determine actual costs, optimize efficiency, and revise rates due to cost changes.
2) Valuation estimates the fair price or value of a property based on type, location, quality, size, and other factors. It is used for buying/selling, taxation, rent calculation, loans, and more. Valuation considers cost, depreciation, income, expenses, and taxes to determine present value.
3) Key terms like market value, scrap value, salv
This document describes the properties of bricks, including their physical, mechanical, and thermal characteristics. It discusses the shape, size, color, density, compressive strength, insulation properties, durability, and frost resistance of standard bricks. It also outlines various tests conducted on bricks, such as those measuring compressive strength and water absorption. Additionally, it defines the qualities of good bricks and provides a classification system for bricks based on their characteristics and intended uses. Special types of bricks are also outlined, including those with modified shapes, perforations, and alternative compositions like sand lime bricks and refractory fire bricks.
Pre-stressed concrete uses tensioned steel strands or bars to place concrete in compression before application of service loads. This counters the tensile stresses induced by loads and prevents cracking. There are two main methods: pre-tensioning applies tension before pouring concrete, while post-tensioning tensions strands after concrete curing. Pre-stressed concrete allows for smaller and lighter structures that resist loads, deflection, and cracking better than reinforced concrete.
The document discusses various types of chemical admixtures used for concrete, including plasticizers, superplasticizers, retarders, accelerators, and air-entraining admixtures. It explains that admixtures can modify the properties of fresh and hardened concrete by altering workability, strength development, permeability, and durability. Superplasticizers in particular are highlighted as they can significantly reduce water content and increase workability and strength. The document concludes that superplasticizers and air-entraining admixtures are most commonly used, and that superplasticizers allow for reduced cement and increased construction of large structures.
Joints are easy to maintain and are less detrimental than uncontrolled or uneven cracks. Concrete expands & shrinks with variations in moisture and temp. The overall affinity is to shrink and this can cause cracking at an early age. Uneven cracks are unpleasant and difficult to maintain but usually do not affect the integrity of concrete.
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This document provides specifications for reinforced cement concrete work. It discusses formwork, reinforcement, and concreting requirements. Formwork must be made of seasoned wood boards at least 30mm thick. Reinforcement bars must meet specifications and be free of rust and contaminants. Concrete proportions and mixing are also specified, with cement to sand to aggregate ratios provided for different mixes. Proper curing and finishing of concrete surfaces is emphasized.
Reinforced cement concrete (RCC) uses steel reinforcement within concrete to improve its tensile strength. Concrete is strong under compression but weak under tension. Steel reinforcement provides high tensile strength due to its high tensile capacity and good bond with concrete. Steel also has a higher elastic modulus, allowing it to resist forces better than concrete alone under the same extension. Cement is a binder that hardens when mixed with water, and can be classified as hydraulic or non-hydraulic. Hydraulic cement can set even when wet or underwater due to additions like fly ash that allow curing in wet conditions. Portland cement is the most common type and consists mainly of tricalcium silicate, dicalcium sil
detailed specification for cement concretevivek gami
This document provides specifications for shuttering, scaffolding, mixing, placing, compacting, protecting, curing, and construction joints for cement concrete. It specifies requirements for shuttering thickness and joints, scaffolding strength and use, measuring and mixing ingredients to achieve proper consistency and strength, curing concrete for at least 7 days, and forming construction joints between concrete pours. It also provides nominal mix proportions for concrete up to M20 strength and notes target strengths should be higher than specified strengths.
reinforced cement Concrete structures failures,repair and mixing typessurya teja
There are two main types of concrete mixers: batch mixers that mix concrete in batches that must be fully emptied and cleaned between batches, and continuous mixers that continuously produce concrete. Batch mixers can be horizontal drum mixers or vertical pan mixers. Drum mixers have fixed blades inside a rotating drum while pan mixers have either a rotating pan or blades. Continuous mixers are non-tilting drums with rotating screw-type blades that continuously feed and discharge concrete.
This document discusses reinforced concrete and its properties. It explains that concrete is weaker in tension than compression, while steel has high tensile strength and bonds well with concrete. When combined, they form reinforced concrete which is strong and durable. The steel carries tensile forces while the concrete resists compression. Proper placement of reinforcement during construction is important for bond. Methods of bending, tying, and installing rebar are also outlined.
Reinforced concrete uses steel reinforcement bars embedded in concrete to resist tensile stresses that concrete cannot withstand on its own. The document discusses the composition, properties, and uses of plain cement concrete (PCC) and reinforced cement concrete (RCC). It explains that PCC is a mixture of cement, sand, aggregate and water, while RCC includes steel reinforcement to improve the concrete's tensile strength. The document also covers reinforcement techniques, types of reinforcing steel, mix proportions, characteristics of concrete structures, and ready-mix concrete.
Reinforced concrete is a composite material consisting of concrete and steel reinforcement. François Coignet built the first iron reinforced concrete structure in 1853. Reinforced concrete uses the strengths of both materials - concrete is strong in compression and steel is strong in tension. It is used widely in construction for buildings, bridges, tunnels and other structures due to its high strength and durability.
The document discusses building maintenance, common defects, and remedial methods for RCC structures. It describes three main common defects: foundations, walls, and concrete/RCC frames. For foundations, common issues include differential settlement, uplift of shrinkage soil, and dampness. For walls, issues include cracking, dampness penetration, and failure during cyclones. For concrete frames, common problems discussed are seepage/leakage, spalling of concrete, and corrosion of steel reinforcement. The document provides detailed remedial methods for addressing each of these defects.
Steel is an alloy of iron and carbon, with small amounts of other elements like manganese, phosphorus, and silicon. Carbon content in common steel grades ranges from 0.1-1%. These alloying elements determine the properties of different steel types. Steels are classified as low alloy (<10% other elements) or high alloy, and can be further broken down by carbon content. Low carbon steels are commonly used and have good weldability and machinability but require cold working to strengthen. Alloying elements like manganese and phosphorus increase hardness and strength but decrease ductility.
This document provides an introduction and overview of reinforcement bar (rebar), including:
1) It describes the different types of steel used for rebar based on carbon content, including mild steel.
2) It explains the differences between deformed bar and tor steel, with deformed bar being more cost effective.
3) It lists several top steel manufacturing companies in Bangladesh and the grades of rebar they produce.
4) It outlines the typical applications of Grade 40 and Grade 60 rebar and their differences in yield strength and ultimate strength.
The document describes the construction process for columns, slabs, and beams in reinforced concrete structures. It discusses the materials used and the typical steps involved, which include:
1) Layout and formwork installation
2) Placement of reinforcing steel based on structural designs
3) Pouring and finishing of concrete
4) Curing of concrete to gain full strength over 28 days
The columns transfer loads vertically through reinforced concrete that is mixed on site or delivered by ready-mix trucks. Slabs and beams are constructed through similar processes of steel reinforcement, formwork, concrete placement and curing.
This document provides an introduction to reinforced concrete, including its key components and purposes. Reinforced concrete is a composite material made of concrete, which resists compression well but has low tensile strength, and steel reinforcing bars, which resist tension well. Together they create an economical and strong structural material. The document outlines structural elements, design considerations for safety, reliability, and economy, and limit state design principles which ensure structures do not fail under expected loads. It also discusses factors that affect concrete durability and different failure modes in reinforced concrete depending on steel reinforcement ratios.
The superstructure of a building consists of elements above the foundation like beams, columns, lintels, roofing and flooring. Beams are horizontal members that carry loads and transfer them to columns or walls. Reinforced concrete beams are designed to resist both bending moments and shear forces from loads. There are different types of beams like simply supported, fixed, cantilever, continuous and overhanging beams which are designed based on how they are supported. Columns are vertical load bearing members that transfer loads from beams and slabs to the foundation. Common column types include long, short and intermediate columns. Lintels are short horizontal members that span small openings like doors and windows and transfer loads to masonry, steel or reinforced concrete
The document outlines the specifications for an apartment building including:
1) RCC framed structure with cement concrete blocks and brick walls. Flooring includes marble, vitrified tiles, and ceramic tiles.
2) Bathrooms have ceramic tile flooring, granite counters, and chromium plated fittings. Doors are teak wood or flush shutters.
3) Amenities include a clubhouse, swimming pool, gym, children's play area, and security systems like CCTV cameras.
sensor interface specification to define consistent parameters for data gathe...Ludovic Privat
This document provides specifications for submitting vehicle sensor data to an analytics processing backend. It defines the logical data model, data elements, encoding, and Protocol Buffer schema. The data elements include timestamps, positions, paths, path events like vehicle status and dynamics, sign and lane recognition, and object detection. Position estimates contain coordinates and attributes. Everything is designed to support ingesting sensor data from vehicles in a standardized way.
Chemical composition of stainless steel pptSachin Shinde
This document provides the chemical composition specifications for various grades of stainless steel, organized by classification. It lists the Japanese Industrial Standard (JIS), American Iron and Steel Institute (AISI), and Unified Numbering System (UNS) designations where available. For each grade, the allowable ranges for key alloying elements such as carbon, silicon, manganese, phosphorus, sulfur, nickel, chromium, molybdenum, and nitrogen are specified. Precipitation hardening grades and those with additional alloying elements are also noted.
One of our most highly rated presenters walks you through highlights of recent changes to Caltrans Section 39 asphalt specifications, including incorporation of elements of “Superpave” testing and acceptance. Toni Carroll is the Northern California Area Manager, Technical Services, for Vulcan Materials.
This document provides specifications for concrete roof slabs and reinforcement. It outlines the proportions of cement, sand, and aggregate for concrete mixes. It describes the types of steel reinforcement to be used and how they should be placed. It also provides details on forming, mixing, placing, and finishing the concrete, including requirements for centering, mixing by hand or machine, laying concrete, and applying a plaster finish.
The document is a declaration by two students, Mr. Nagraj G.S. and Mr. Madhusudhan, declaring that the organizational study report they prepared on R.S Spun Pipes was done under the internal guidance of their faculty Mr. Shankar B.S. and external guidance of Mr. Siddu G.S., and has not been submitted elsewhere. It also includes their signatures acknowledging and approving the contents of the report.
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THE GATE ACADEMY's GATE Correspondence Materials consist of complete GATE syllabus in the form of booklets with theory, solved examples, model tests, formulae and questions in various levels of difficulty in all the topics of the syllabus. The material is designed in such a way that it has proven to be an ideal material in-terms of an accurate and efficient preparation for GATE.
Quick Refresher Guide : is especially developed for the students, for their quick revision of concepts preparing for GATE examination. Also get 1 All India Mock Tests with results including Rank,Percentile,detailed performance analysis and with video solutions
GATE QUESTION BANK : is a topic-wise and subject wise collection of previous year GATE questions ( 2001 – 2013). Also get 1 All India Mock Tests with results including Rank,Percentile,detailed performance analysis and with video solutions
The document discusses different types and uses of concrete. It describes three ways concrete can be classified: by binding material (cement or lime concrete), design (plain, reinforced, or pre-stressed concrete), and purpose (vacuum, air entrained, or light weight concrete). For each type, the key ingredients and common uses are provided. The document also covers mix design ratios, water-cement ratios, slump and workability tests, and the compaction factor test for evaluating concrete workability.
Concrete is a composite material made of cement, water, aggregates, and in some cases admixtures. The cement and water form a paste that binds the aggregates together when hardened. Concrete can be molded into various shapes and is one of the most widely used construction materials in the world due to its versatility, strength, and availability of constituents. Concrete is commonly classified according to its binding material, design, or purpose. Common types include cement concrete, reinforced concrete, pre-stressed concrete, vacuum concrete, and lightweight concrete.
This document discusses the functions of sand and surkhi in mortars. It states that sand reduces shrinkage and cracking, helps lime set faster, and allows for varying strength by adjusting proportions. Surkhi acts as an adulterant to reduce costs, and provides strength and color to mortar. The document also provides strengths of different types of masonry constructed with various mortars, and recommendations for selecting appropriate mortars based on engineering application and stresses.
This document provides an overview of concrete, including its composition, properties, requirements, and design. Concrete is made up of cement, water, and fine and coarse aggregates. It hardens due to a chemical reaction between cement and water. Good concrete must be workable when fresh and possess desired strength and durability when hardened. Concrete's strength depends on factors like the water-cement ratio, aggregate size and shape, mixing, placing, compaction, and curing. Reinforced concrete incorporates steel to handle tensile stresses that plain concrete cannot withstand. Proper mix design is needed to obtain concrete with desired properties based on guidelines around water-cement ratios, aggregate grading and size, and cement quantities.
Concrete is an important construction material due to its strength, durability, versatility and cost-effectiveness. It is composed of cement, water and aggregates. Concrete offers advantages such as durability under various weather conditions, the ability to be molded into different shapes, fire resistance, sustainability and ease of construction. These properties make concrete widely used for infrastructure, housing and commercial structures.
Rishabh Lala is a student in the 6th semester at Rajiv Gandhi Technological University in Bhopal. The document discusses various topics related to concrete including its composition, types, properties, testing, ingredients, water-cement ratio, workability, curing, and types of cement. It provides definitions and details on plain cement concrete, reinforced cement concrete, pre-stressed concrete, lime concrete, air entrained concrete, and more.
you would be aware about the different types of special concrete being used in india.All these types of concrete are being produced by ultratech concrete, for more details visit www.ultratechconcrete.com/concrete_types.html
This document provides information about concrete, including its definition, classification, mix design, tests, and qualities. It can be summarized in 3 sentences:
Concrete is summarized as a composite material made of cement, sand, stone and water that is widely used in construction. The document outlines various types of concrete based on binding material, design, and purpose, and discusses factors in concrete mix design, methods of mixing, placing, curing, and tests to determine qualities like strength, workability, and water tightness. Modern concrete is the most widely used man-made material and the document provides its classification and testing methods.
The document discusses load bearing structures and framed structures. It provides details on:
- Load bearing structures transfer loads through walls to foundations, allowing only limited height buildings. Framed structures use beams and columns to transfer loads, allowing taller buildings.
- Properties, advantages, and disadvantages of each type are outlined such as construction speed, material usage, flexibility and earthquake resistance.
- Examples given of each include load bearing structures like IIM Ahmedabad and framed structures like Burj Al Arab.
Concrete technology and masonry structuresNripeshJha
This document provides information about concrete technology and masonry structures. It discusses the different types of concrete like plain cement concrete, reinforced cement concrete, and pre-stressed concrete. It describes the materials used in concrete like aggregates, cement, water, and admixtures. It also discusses concepts like workability, shrinkage, creep, and strengths of concrete. Additionally, it provides an overview of masonry, describing it as the building of structures from individual masonry units laid together with mortar. It lists some examples of masonry structures and the different types of masonry units.
This document provides an overview of concrete, including its composition, properties, types, and testing. It discusses the ingredients of concrete including cement, sand, gravel, and water. It describes types of concrete such as plain cement concrete, reinforced cement concrete, and pre-stressed concrete. It also summarizes different types of cement and tests used to evaluate concrete, including slump and compaction factor tests.
Concrete is a mixture of aggregate, cement, water, and sometimes admixtures. Its key qualities are strength, durability, stability, and relatively low cost. Concrete can be poured into any shape and colored. It has been used as a building material since ancient Roman times, when they discovered volcanic ash improved cement. Throughout history, improvements were made such as reinforced concrete, precast concrete, prestressed concrete, and roller-compacted concrete. Concrete has various uses such as structural elements, pavements, pipes, and sculptures. It exists in different states from plastic to hardened and has properties of workability, cohesion, strength, and durability that are affected by its mixture proportions and density.
Structural lightweight concrete and fibre reinforced concrete are special types of concrete developed to improve certain properties. Structural lightweight concrete contains lightweight aggregates, giving it a lower density than normal concrete, and is used to reduce dead loads in structures like high-rise buildings. Fibre reinforced concrete includes short discrete fibres, such as steel fibres, which increase its tensile strength and crack resistance compared to plain concrete.
Building construction/Unit 2 /Basic civil engineeringParimal Jha
The document provides information on concrete foundations, including the key ingredients of concrete and their functions. It discusses different grades of concrete based on their compressive strength. Formwork, mixing, placing, compaction and curing of concrete are explained. Different types of foundations are described, including shallow foundations like spread footings, strap footings and mat foundations. Deep foundations such as pile foundations and pier foundations are also summarized. Load bearing and framed structures are compared in terms of their suitability for different types of buildings and soils.
concrete technology lecture notes for BTech studentsPanshulJamwal
This document outlines the syllabus for a 14-week concrete technology course. The course covers topics such as cements, aggregates, fresh and hardened concrete, mixing, placing, curing, testing, and durability. It includes weekly lectures and a midterm and final exam. The first chapter discusses concrete as a material, including its nature, advantages, and limitations. Concrete is a composite of aggregates bound in a hardened cement paste. It has advantages like strength and shapeability but limitations like low tensile strength and cracking from shrinkage.
This document discusses bendable concrete, also known as engineered cementitious composites (ECC). ECC is reinforced with micromechanically designed polyvinyl alcohol (PVA) fibers, which allow it to bend up to 5% tensile strain without fracturing like conventional concrete. ECC is made from similar ingredients as concrete but without coarse aggregates. It acts more like a flexible metal than brittle glass. Potential applications mentioned include earthquake resistant buildings, concrete canvas for military use, and more durable bridges and roads with reduced need for expansion joints.
Concrete -
The most used construction material.
In here a brief about its -
Ingredients
Grades
Production &
Properties
are discussed with appropriate pictorial presentation making it quite simpler for understanding.
Granite is an igneous rock composed of feldspar, mica, and silica that comes in various colors like gray and red. Medium-grained granite is well-suited for construction while fine-grained granite can be polished but is harder to work. Sandstone is a sedimentary rock consisting of fragments cemented together, and it comes in colors like white, yellow, and brown. Marble is a metamorphic rock formed from limestone that is easy to carve and comes in colors such as white, black, and green.
This document provides an overview of doors, including their components and types. It discusses the frame and shutter, as well as technical terms like head, sill, and horn. Doors are classified based on their arrangement of components, method of construction, operation, and materials. Battened, ledged, framed, and braced doors are described. Other door types covered include glazed, flush, louvered, revolving, sliding, swing, rolling steel shutter, and metal doors. Location considerations and specifications for doors are also mentioned.
Reinforced concrete columns and beams are important structural elements that carry compressive and bending loads respectively. Columns can be categorized as short or long based on their height-width ratio and as spiral or tied columns based on their shape. Beams are classified based on their supports as simply supported, fixed, continuous, or cantilever beams. The construction of RCC columns and beams involves laying reinforcement, forming the structure, and pouring concrete to create these load-bearing elements.
The document discusses various types of floor finishes that can be used for commercial, residential and industrial settings. It describes different flooring materials like tiles, wood, PVC, marble, granite, glass and natural stones. For each material, it provides details on types, finish, durability, usage, installation process, costs and maintenance requirements. The document also provides specifications and laying procedures for ceramic tiles and stone flooring.
The document discusses specifications and estimations for various types of glass. It provides details on the composition, properties, and applications of glass types including annealed glass, heat-strengthened glass, tempered glass, laminated glass, insulating glass, reflective glass, tinted glass, wired glass, patterned glass, and glass bricks. It also discusses factors to consider for determining the safe thickness of glass, safety issues related to glass structures, and companies involved in glass manufacturing.
The document provides information on various types of floor finishes that can be used for both commercial and residential projects. It discusses tile, wood, PVC, marble, granite, glass, and natural stone flooring options. For each type of flooring, it provides details on the different varieties available, typical durability, usage scenarios, installation process and costs. The document also includes specifications and laying instructions for ceramic tiles and discusses various natural stone options like limestone, sandstone, quartzite, cobblestone, slate and pebblestone.
Gypsum is a mineral that is processed and used to make gypsum board (drywall). Gypsum board has several advantages such as ease of installation, fire resistance, sound isolation, durability and economy. It is available in various thicknesses for different applications. Regular gypsum board is used for walls and ceilings. Multi-ply systems use two or more layers of gypsum board to increase fire resistance and soundproofing. Gypsum board installation requires basic tools and is applied either directly to framing or with furring strips to surfaces like masonry.
This document provides information on gypsum board (drywall), including:
1. Gypsum is a mineral used to make gypsum board, which consists of a gypsum core bonded between paper facings.
2. Gypsum board has several advantages such as ease of installation, fire resistance, sound isolation, durability and economy.
3. There are different types of gypsum board for various applications, like regular board for walls/ceilings, fire-resistant Type X board, and moisture-resistant board for tiling.
The document provides specifications for lime mortar and excavation and foundation work. It discusses the properties and types of lime mortar, including non-hydraulic and hydraulic lime mortar. It also outlines the process of excavation, including depth, methods such as open cut and braced excavation, and backfilling. Measurements for excavation work and appropriate equipment for different soil conditions are also specified.
Steel is a versatile material that is commonly used for large scale construction projects due to its strength, durability, and cost-effectiveness. Steel trusses are a type of structure frequently employed in buildings to provide support for roofs, floors, and other loads. They consist of compression and tension elements arranged in a triangulated pattern, allowing them to efficiently span long distances with minimal material. Common types of steel truss designs include Pratt, Warren, and Fink configurations. Truss members are often made of angles, channels, tubes, or other standard steel sections joined together with bolted or welded connections.
Masonry is the building of structures from units like brick and stone laid together with mortar. There are several types of masonry walls including load-bearing walls that support structural loads, non-load bearing walls that only support themselves, and cavity walls that have two wythes separated by an airspace for insulation and drainage. Masonry construction can also use different bonding patterns, reinforcement, and materials like concrete blocks, stone, or brick veneers to provide durability and strength.
Concrete and concrete blocks are materials commonly used for retaining walls. Concrete is composed of aggregate bonded with cement that hardens over time. Concrete blocks come in solid, hollow, and interlocking forms and can be lightweight, medium, or normal weight depending on their aggregate mix. Retaining walls made of concrete blocks are laid with mortar between each block to retain soil behind the wall. The base of the retaining wall is thickest to withstand pressure, while the top is thinner, and reinforcement is often added along the outer surfaces to support heavy loads exerted on the wall.
Ceramics can be classified into several categories based on their composition and properties. They include whitewares used for crockery, tiles, and sanitary products; refractories used in furnaces due to their high temperature resistance; glasses used for windows, containers, and fibers; and cements used to make concrete. Ceramics have properties like extreme hardness, corrosion and heat resistance, low electrical and thermal conductivity, and high strength at elevated temperatures. However, they also have low ductility and toughness making them brittle. The industrial processing of ceramics involves steps like drying and high temperature firing to form glass between silicon dioxide particles. Common ceramic products discussed are tiles, technical ceramics, and glass
The document discusses foundations, which are the part of a structure below ground level that transmits the load of the superstructure to the soil. It also discusses concrete mixes like M25 grade concrete, which has a specified 28-day compressive strength of 25 N/mm2. Finally, it provides specifications for excavation of foundations, removal of water from foundations, damp proof course installation, and precautions for designing foundations.
The document discusses different types of paints used for interior and exterior surfaces. It describes the key ingredients in paint like pigments, binders, liquids, and additives. It also outlines different types of surface finishes like white wash, color wash, distemper, cement paint etc. The preparation of surfaces prior to painting and application methods for different paint types are explained. Water based and oil based paints are compared in terms of their advantages.
The document discusses polyvinyl chloride (PVC), including its manufacturing process, properties, applications, and specifications. Some key points:
- PVC is made from salt and oil/gas and was first commercially produced in the 1920s. It has properties like durability, chemical resistance, and electrical insulation that make it suitable for many applications.
- Common PVC applications include pipes, flooring, cables, furniture, and construction materials. Specific uses outlined include water pipes, electrical conduits, roofing, and plumbing fittings.
- PVC comes in variants like UPVC and CPVC that are used for different applications based on their properties like heat and pressure resistance.
- Indian Standards
Timber is wood suitable for building or carpentry that comes from trees in three forms: rough timber obtained after felling, converted timber cut into sizes for commerce, and standing timber contained in living trees. Timber has properties like low heat conductivity, ability to be worked mechanically, and high strength, but is also flammable and prone to decay and moisture-related property fluctuations. There are three main types of timber: hardwoods, softwoods, and manufactured wood products.
The document summarizes different types of windows, including fixed windows, pivoted windows, double-hung windows, sliding windows, casement windows, louvred windows, metal windows, bay windows, awning windows, and skylights. It describes the key characteristics of each window type, such as how they open/close, materials used, advantages, and common applications. The document also discusses window materials, fixtures and fastenings, and provides details on hinges, bolts, handles, locks and various material options like wood, aluminum, fiberglass and PVC.
This document discusses glass fiber reinforced concrete (GFRC), which is a composite material made of cement mortar reinforced with glass fibers. It explains that the addition of glass fibers improves several properties of concrete, including increasing tensile strength, reducing cracking from shrinkage, and improving durability. The key factors that affect GFRC properties are the relative amounts of fiber and matrix, fiber aspect ratio, fiber orientation, and workability of the concrete mixture. Different types of glass fibers include A-glass, C-glass, E-glass, and S-glass. GFRC has applications in exterior ornamentation, interior details, landscape furnishings, and infrastructure projects due to its strength, impact resistance, and durability.
Concrete and concrete blocks are materials commonly used for retaining walls. Concrete is composed of aggregates bonded together with cement, while concrete blocks come in solid, hollow, or interlocking forms. Concrete blocks can be used for load-bearing or decorative applications such as retaining walls, siding, and homes. Retaining walls are structures that hold soil and come in various materials like concrete blocks, poured concrete, or stone. Their thickness decreases as they ascend to support the changing pressures of retained soil. Reinforcement is often included to strengthen retaining walls against heavy loads.
How to Create User Notification in Odoo 17Celine George
This slide will represent how to create user notification in Odoo 17. Odoo allows us to create and send custom notifications on some events or actions. We have different types of notification such as sticky notification, rainbow man effect, alert and raise exception warning or validation.
THE SACRIFICE HOW PRO-PALESTINE PROTESTS STUDENTS ARE SACRIFICING TO CHANGE T...indexPub
The recent surge in pro-Palestine student activism has prompted significant responses from universities, ranging from negotiations and divestment commitments to increased transparency about investments in companies supporting the war on Gaza. This activism has led to the cessation of student encampments but also highlighted the substantial sacrifices made by students, including academic disruptions and personal risks. The primary drivers of these protests are poor university administration, lack of transparency, and inadequate communication between officials and students. This study examines the profound emotional, psychological, and professional impacts on students engaged in pro-Palestine protests, focusing on Generation Z's (Gen-Z) activism dynamics. This paper explores the significant sacrifices made by these students and even the professors supporting the pro-Palestine movement, with a focus on recent global movements. Through an in-depth analysis of printed and electronic media, the study examines the impacts of these sacrifices on the academic and personal lives of those involved. The paper highlights examples from various universities, demonstrating student activism's long-term and short-term effects, including disciplinary actions, social backlash, and career implications. The researchers also explore the broader implications of student sacrifices. The findings reveal that these sacrifices are driven by a profound commitment to justice and human rights, and are influenced by the increasing availability of information, peer interactions, and personal convictions. The study also discusses the broader implications of this activism, comparing it to historical precedents and assessing its potential to influence policy and public opinion. The emotional and psychological toll on student activists is significant, but their sense of purpose and community support mitigates some of these challenges. However, the researchers call for acknowledging the broader Impact of these sacrifices on the future global movement of FreePalestine.
Dreamin in Color '24 - (Workshop) Design an API Specification with MuleSoft's...Alexandra N. Martinez
This workshop was presented in New Orleans for the Dreamin' in Color conference on June 21, 2024.
Presented by Alex Martinez, MuleSoft developer advocate at Salesforce.
2. INTRODUCTION
Reinforced Cement Concrete in which steel is embedded in such a
manner that the two materials act together in resisting forces. The
reinforcing steel—rods, bars, or mesh—absorbs the tensile, shear, and
sometimes the compressive stresses in a concrete structure. The
invention of reinforced concrete in the 19th century revolutionized the
construction industry, and concrete became one of the world’s most
common building materials.
3. HISTORY
François Coignet was a French industrialist of the nineteenth
century, a pioneer in the development of structural,
prefabricated and reinforced concrete.Coignet was the first to
use iron-reinforced concrete as a technique for constructing
building structures.In 1853 Coignet built the first iron reinforced
concrete structure, a four story house at 72 rue Charles Michels
in the suburbs of Paris.Coignet's descriptions of reinforcing
concrete suggests that he did not do it for means of adding
strength to the concrete but for keeping walls in monolithic
construction from overturning. In 1854, English builder William
B. Wilkinson reinforced the concrete roof and floors in the two-
storey house he was constructing. His positioning of the
reinforcement demonstrated that, unlike his predecessors, he
had knowledge of tensile stresses
4. MATERIALS USED
Cement is the main material used
for RCC. It acts as the matrix in
which other ingredients are
mixed to get the final outcome.
Other than cement, steel
reinforcements comprise the
RCC. It bears all the tensile load
where the compressive load is
taken by the concrete.
REINFORCEMENTS
CEMENT
5. COARSE AGGREGATES
FINE AGGREGATES
The fine aggregates
include silt, sand and
other binding materials. It
holds the concrete and
reinforcements together.
Coarse aggregates are slightly
bigger than the silt and sand
used as binding material.
7. Aggregates have two types of moisture:
1. Absorbed moisture – retained in pores
2. Surface moisture – water attached to surface Aggregates have
four moisture states
Oven dry: all moisture removed
Air dry: internal pores partially full & surface dry
Saturated-surface dry: pores full & surface moisture removed
Wet: pores full and surface film
SSD aggregate does not add or subtract water ,not easily obtained
in the field
Moisture Absorption -We must determine how much water dry
aggregate will consume into its voids This takes water away from
the mix and reduces workability & W/C ratio We adjust mix
proportions for absorption We want to provide aggregates water
for absorption & maintain workability of the mix .
8. RCC SPECIFICATIONS
• Shuttering shall be done using seasoned wooden boards of
thickness not less than 30mm.
• Surface contact with concrete shall be free from adhering grout,
nails, splits and other defects.
• All the joints are perfectly closed and lined up.
• The shuttering and framing is sufficiently braced.
• Nowadays timber shuttering is replaced by steel plates.
• All the props of approved sizes are supported on double wedges
and when taken out, these wedges are eased and not knocked out.
• All the framework is removed after 21 days of curing without any
shocks or vibrations.
9. • All reinforcement bars conform IS specifications and are free from
rust, grease oil etc.
• The steel grills are perfectly as per detailed specifications.
• The covers to concrete are perfectly maintained as per code.
• Bars of diameter beyond 25mm diameter are bent when red hot.
• The materials proportion should be as per the specifications of the
concrete.
10. NUMBER OF CEMENT BAGS REQUIRED FOR A
SPECIFIC CEMENT CONCRETE RATIOS
• For cement concrete of ratio 1:1:2(1 cement:1sand/coarse
sand:2graded stone aggregate) require 11no bags of 50kg.
• For cement concrete of ratio 1:1.5:3 require 7.8no bags of 50kg.
• For cement concrete of ratio 1:2:4 require 6 no bags of 50kg.
• For cement concrete of ratio 1:3:6 require 4.25no bags of 50kg.
• For cement concrete of ratio 1:4:8 require 3.2 no bags of 50kg.
• For cement concrete of ratio 1:5:10 require 2.50 no bags of 50kg.
• For cement concrete of ratio 1:6:12 require 2.25 no bags of 50kg
11. METHOD OF PREPARATION
CONCRETE PREPARATION:
In its simplest form, concrete is a mixture of paste and
aggregates, or rocks. The paste, composed of portland cement
and water, coats the surface of the fine (small) and coarse
(larger) aggregates. Through a chemical reaction called
hydration, the paste hardens and gains strength to form the
rock-like mass known as concrete.
Within this process lies the key to a remarkable trait of concrete:
it's plastic and malleable when newly mixed, strong and durable
when hardened.
12. PROPORTIONING:
• The key to achieving a strong, durable concrete rests in the careful
proportioning and mixing of the ingredients. A mixture that does not
have enough paste to fill all the voids between the aggregates will
be difficult to place and will produce rough surfaces and porous
concrete. A mixture with an excess of cement paste will be easy to
place and will produce a smooth surface; however, the resulting
concrete is not cost-effective and can more easily crack.
13. • The quality of the paste determines the character of the
concrete. The strength of the paste, in turn, depends on the
ratio of water to cement. The water-cement ratio is the
weight of the mixing water divided by the weight of the
cement. High-quality concrete is produced by lowering the
water-cement ratio as much as possible without sacrificing
the workability of fresh concrete, allowing it to be properly
placed, consolidated, and cured.
• A properly designed mixture possesses the desired
workability for the fresh concrete and the required durability
and strength for the hardened concrete. Typically, a mix is
about 10 to 15 percent cement, 60 to 75 percent aggregate
and 15 to 20 percent water. Entrained air in many concrete
mixes may also take up another 5 to 8 percent.
14. OTHER INGREDIENTS:
WATER: Almost any natural water that is drinkable and has no
pronounced taste or odor may be used as mixing water for
concrete. Excessive impurities in mixing water not only may affect
setting time and concrete strength, but can also cause
efflorescence, staining, corrosion of reinforcement, volume
instability, and reduced durability. Concrete mixture specifications
usually set limits on chlorides, sulfates, alkalis, and solids in mixing
water unless tests can be performed to determine the effect the
impurity has on the final concrete.
• AGGREGATES: Aggregates comprise 60 to 75 percent of the total
volume of concrete. The type and size of aggregate used depends
on the thickness and purpose of the final concrete product.
Relatively thin building sections call for small coarse aggregate,
though aggregates up to six inches in diameter have been used in
large dams. A continuous gradation of particle sizes is desirable for
efficient use of the paste. In addition, aggregates should be clean
and free from any matter that might affect the quality of the
concrete.
15. ADVANTAGES
• Reinforced concrete has a high compressive strength compared to
other building materials.
• Due to the provided reinforcement, reinforced concrete can also
withstand a good amount tensile stress.
• Fire and weather resistance of reinforced concrete is fair.
• The reinforced concrete building system is more durable than any
other building system.
• Reinforced concrete, as a fluid material in the beginning, can be
economically molded into a nearly limitless range of shapes.
16. • The maintenance cost of reinforced concrete is very low.
• In structure like footings, dams, piers etc. reinforced concrete is the
most economical construction material.
• It acts like a rigid member with minimum deflection.
• As reinforced concrete can be molded to any shape required, it is
widely used in precast structural components. It yields rigid
members with minimum apparent deflection.
• Compared to the use of steel in structure, reinforced concrete
requires less skilled labor for the erection of structure.
17. DISADVANTAGES
• The tensile strength of reinforced concrete is about one-tenth of its
compressive strength.
• The main steps of using reinforced concrete are mixing, casting, and
curing. All of this affect the final strength.
• The cost of the forms used for casting RC is relatively higher.
• For multi-storied building the RCC column section for is larger than
steel section as the compressive strength is lower in the case of
RCC.
• Shrinkage causes crack development and strength loss
18. PRECAST
• Precast concrete is a
construction product produced
by casting concrete in a reusable
mold or "form" which is then
cured in a controlled
environment, transported to the
construction site and lifted into
place. In contrast, standard
concrete is poured into site-
specific forms and cured on site.
Precast stone is distinguished
from precast concrete by using a
fine aggregate in the mixture, so
the final product approaches the
appearance of naturally
occurring rock or stone.
PRECASTED CONCRETE STRUCTURE
19. • By producing precast concrete in a controlled environment
(typically referred to as a precast plant), the precast concrete is
afforded the opportunity to properly cure and be closely monitored
by plant employees. Utilizing a precast concrete system offers many
potential advantages over site casting of concrete. The production
process for precast concrete is performed on ground level, which
helps with safety throughout a project. There is a greater control of
the quality of materials and workmanship in a precast plant rather
than on a construction site. Financially, the forms used in a precast
plant may be reused hundreds to thousands of times before they
have to be replaced, which allow cost of formwork per unit to be
lower than for site-cast production.
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