1. 1
Soran University
Faculty of Engineering - Civil Engineering Department
SLUMP TEST
Student: Sarchia Khursheed
Experiment NO.: 2
Date: 06.04.2016
Supervisor: Arianfar Haji
Objective
2. 2
The concrete slump test is used to determine of concrete's workability,
or fluidity. Also indirectly to determine of concrete consistency or
stiffness.
Introduction
The concrete slump test is used for the measurement of a property of
fresh concrete. The test is an empirical test that measures the
workability of fresh concrete. More specifically, it measures
consistency between batches. The test is popular due to the simplicity
of apparatus used and simple procedure.
The slump test is perhaps the most widely used because of the
simplicity of the apparatus required and the test procedure. The slump
test indicates the behavior of a compacted concrete cone under the
action of gravitational forces. The slump test is a practical means of
measuring the workability. Changes in the value of slump obtained
during a job may indicate changes in materials, in the water content or
in the proportions of the mix, so it is useful in controlling the quality of
the concrete produced.
Apparatus
Slump cone (Height = 30 cm, Base dia = 20 cm, Top dia = 10
cm)
Temping rod (steel) (Length = 60 cm, Dia = 16 mm)
Scale for measurement
Scoop
Base Plate
Brush
Materials
Concrete (mix design: 1:2:4), (w/c ratio: 0.45)
o Cement (2.5 kg)
o Fine Aggregate (5 kg)
o Coarse Aggregate (10 kg)
o Water (1.125 kg)
3. 3
Procedure
1. The internal surface of the mould is thoroughly cleaned and
freed from superfluous moisture before commencing the test.
And if the cone is in completely dry condition then dampen it
using a damp cloth.
2. The mould is then placed on a smooth, horizontally leveled rigid
and non-absorbent surface such as a rigid plate. It is held firmly
in place during filling by the operator by standing on the two foot
pieces provided in the slump cone.
3. The mould is filled by concrete in three layers, each
approximately one-quarter of height of the mould, and each
layer is tamped down with 25 strokes of tamping rod with
pointed end in a uniform manner.
4. After tamping the top layer, the concrete is struck off level with
a trowel and any mortar leaked out between the mould and base
plate is cleaned away.
5. The mould is then removed from the concrete immediately by
raising it slowly and carefully in a vertical direction, and read the
slump.
Data and Result
The result of slump test by using
the above amount of cement, fine
aggregate, coarse aggregate, and
water was zero slump.
Discussion and Conclusion
In result we get zero slump, in this time we must repeat the test, but
with different mix design and water/cement ratio, for obtaining true
slump.
However, the slump test has been found to be useful in ensuring the
uniformity among different batches of supposedly similar concrete
under field conditions.
4. 4
This sample of concrete which has zero slump test result and very dry
mixes, usually used in road making. Roads vibrated by power operated
machines.
