Slump Test

The slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows

How is slump measured?

Simply defined, slump is a measure of the consistency of fresh concrete. The slump test is a very simple test. The slump cone is a right circular cone that is 12 inches high. The base of the cone is 8 inches in diameter and the top of the cone is 4 inches in diameter.

Concrete Slump Test Procedure


Firstly, the internal surface of the mould is cleaned carefully. Oil can be applied on the surface.


The mould is then placed on a base plate. The base plate should be clean, smooth, horizontal and non-porous.


The mould is filled with fresh concrete in three layers. Each layer is tamped 25 times with a steel rod. The diameter of this steel rod is 5⁄8inch. The rod is rounded at the ends. The tamping should be done uniformly.


After filling the mould, excess concrete should be removed and the surface should be levelled. When the mould is filled with fresh concrete, the base of the mould is held firmly by handles.


Then the mould is lifted gently in the vertical direction and then unsupported concrete will slump. The decrease in height at the centre point is measured to nearest 5mm or 0.25 inch and it is known as ‘slump’.

Measurement of workability from Slump Test


If shear slump or collapse slump occurs, the test should be repeated. We can get the result from the only true slump. We can classify the result within some ranges according to the slump value.

Very low workability: slump value 0-25mm or 0-1 inch


Low workability: slump value 25-50mm or 1-2 inch


Medium workability: slump value 50-100mm or 2-4 inch


High workability: slump value 100-175mm or 4-7 inch


According to 'Fresh Concrete' by P. Bartos, slump results can be classified as given below:

No slump: slump value 0 mm or 0 inch


Very Low: sump value 5-10 mm or 0.25-0.5 inch


Low: sump value 15-30 mm or 0.75-1.25 inch


Medium: sump value 35-75 mm or 1.5-3 inch


High: sump value 80-155 mm or 3.25-6 inch


Very High: sump vaue180 mm or 6.25 inch to collapse



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