Soran University

Faculty of Engineering - Civil Engineering Department

SLUMP TEST

Student: Sarchia KhursheedExperiment NO.: 2Date: 06.04.2016

Supervisor: Arianfar Haji

ObjectiveThe concrete slump test is used to determine of concrete's workability, or fluidity. Also indirectly to determine of concrete consistency or stiffness.

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IntroductionThe 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)

Procedure1. 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.

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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 ResultThe result of slump test by using the above amount of cement, fine aggregate, coarse aggregate, and water was zero slump.

Discussion and ConclusionIn 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.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.

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