Slump test

Expt No:
Date:
SLUMP TEST
AIM:
To determine the workability of concrete by conducting the slump test.
PRINCIPLE:
Slump test is carried out to measure the consistency of concrete, which is
a measure of workability. Consistency refers to the ability of fresh concrete to
flow, without segregation of ingredients. A concrete mix with less consistency is
termed as a stiff mix whereas that with a high consistency is called a soft mix.
The major factor influencing the consistency and workability of concrete is the
water/cement ratio. Consistency tests are usually recommended for concrete
having aggregate size lower than 40 mm.
In the slump test, consistency of concrete is expressed n terms of the
slump of the concrete mix. Slump is the subsidence of concrete (measured in
millimeters) when tested using a standard procedure.
When a standard slump cone is filled with concrete and when the cone is
lifted up slowly, leaving the moulded concrete unsupported laterally, the
concrete subsides under the force of gravity to a smaller height. The decrease in
height is measured as its slump. The following figure gives the general slump
patterns.
In rich mixes, even subsidence of concrete takes place resulting in true
slump. Here, the slump is sensitive to variations in workability. Shear slump is
one in which one half of the cone slides down along an inclined plane. Harsh mix
may result in shear

OBSERVATIONS AND CALCULATIONS:
Mix ratio = 1:1.43:3.64
W/C ratio
Initial level
(mm)
Final slump
(mm)
Slump in mm

RESULT:
Slump of for 1:1.43:3.64 concrete at water-cement ratio 0.6 =
mm.
DISCUSSIONS:
1) Slump teat is used as a field test to determine the workability of concrete.
Give reasons.
2) What are the imitations of the slump test in determining the workability of
concrete?
3) Following table gives the slump required for different situations. Discuss with
your test result.
Road work 10-25 mm
Mass concrete 25-50 mm
Beams and slabs 50-100 mm
Thin vertical members & retaining walls 75-125 mm
4) What factors would have affected your test results?

Slump test

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Slump test