12th CBSE Chemistry Project

Chemistry
Project
2014-2015
AshwinFrancis
XII A

In the accomplishment of this project successfully, many
people have best owned upon me their blessings and the heart
pledged support, this time I am utilizing to thank all the
people who have been concerned with project.
Primarily I would thank god for being able to complete this
project with success. Then I would like to thank my principal
Mr. DHIR SINGH and chemistry teacher Mr. NARESH, whose
Valuable guidance has been the ones that helped me patch this
Project and make it full proof success his suggestions and his
Instructions has served as the major contributor towards the
Completion of the project.
Then I would like to thank my parents and friends who have
helped me with their valuable suggestions and guidance has
been helpful in various phases of the completion of the project.
Last but not the least I would like to thank my classmates
who have helped me a lot.

This is to certify that ASHWIN FRANCIS, student of class XII A
(2014-2015), Kendriya Vidyalaya,Gole Market, New Delhi has
completed his project mentioned below under the guidance
of Mr. Naresh (subject teacher) the year 2014-2015.
Signature of Signature of
external examiner chemistry teacher

1. CERTIFICATE OF EXCELLENCE
2. ACKNOWLEDGEMENT
3. AIM OF PROJECT
4. INTRODUCTION
5. THEORY
6. APPARATUS REQUIRED
7. PROCEDURE FOLLOWED
8. OBSERVATION
9. CONCLUSION
10. PRECAUTION
11. BIBLIOGRAPHY

In the most general sense of the word, CEMENT is a
binder, a substance that sets and hardens
independently, and can bind other materials together.
The word “ cement “ traces to the Romans, who used
the term opus caementicium to describe masonry
resembling modern concrete that was made from
crushed rock with burnt lime as binder. The volcanic
ash and a pulverized brick additive that were added to
the burnt lime to obtain a hydraulic binder were later
referred to as cementum, cimentum, cement and
cement. The most important use of cement is the
production of mortar and concrete The bonding of
natural or artificial aggregates to form a strong building
material that is durable in the face of normal
environment effects.

Cement is made by heating limestone (calcium
carbonate), with small quantities of other materials
(such as clay) to 1450ͦC in a kiln, in a process known as
calcination, whereby a molecule of carbon dioxide is
liberated from the calcium carbonate to form calcium
oxide, or quicklime, which is then blended with the
other materials that have been included in the mix. The
resulting hard substance, called ‘clinker’, is then
ground with a small amount of gypsum into a powder
to make ‘Ordinary Portland Cement’, the most
commonly used type of cement(often referred to as
OPC).Portland cement is a basic ingredient of concrete,
mortar and non speciality grout. The most common
use for portland cement is in the production of
concrete. Concrete is a composite material consisting
of aggregate (gravel and sand), cement and water. As a
construction material, concrete can be cast in almost
any shape desired and once hardened, can become a
structural (load baering) element. Portland cement
may be gray or white.

Cement used in construction is characterised as
hydraulic or non-hydraulic. Hydraulic cements (eg.
Portland cement) harden because of hydration
chemical reactions that occurs independently Of the
mixture’s water content; they can harden even
underwater or when constantly exposed to wet
weather. The chemical reaction that results when the
anhydrous cement powder is mixed with water
produces hydrates that are not water-soluble. Non-
hydraulic cements (eg. Lime and gypsum plaster) must
be kept dry in order to retain their strength.

Sand obtained from different sources has different
qualities. For example, Sea sand obtained from sea
contains unwanted salts and retards setting of cement
and is not suitable for making mortar. On the other
hand, Pit sand is obtained from pits in the soil and the
River sand obtained from riverbed is considered
excellent for preparing mortar and concrete.
Time has an important role on strength of developed
cement mortar. When a cement paste in the ratio 1:3
in water is allowed to dry, the strength of solid mass
keeps on increasing with increase in time given for
setting. It acquires a nearly full strength in 28 day.

1.Beakers, glass rods, weight box, matchboxes
2. Limestone, river sand, cement and fly ash

1. Prepare mixtures of various compositions as given in
Observation table.
2. Take each of the given mixtures in different beakers
and prepare their pastes by adding minimum amount
of water
3. Take nine cases of empty match boxes and mark
them from 1 to 9.
4. Fill the three cases with the paste of each
composition.
5. Spray water from time to time over the paste ,so
that they remain moist all the time.
6. After three days, take out one slab of each
composition and test their strengths.
7. Similarly, take out a set of three slabs after 7 days
after 30 days respectively and test their strengths.

By seeing the observation we can estimate the
hardness of the slab.
The strength of the slab increases with the increase in
setting time allowed.

1.Handle the glass wares safely.
2.Allow the time required to set.
3.Spray only required amount of water.

HELP FROM INTERNET
INFORMATION FROM LIBRARY
HELP FROM TEACHERS

To study the setting of mixture of cement
with sand, time and fly ash with respect to
time and strength.

12th CBSE Chemistry Project

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