Slump Test of Concrete is a Measure of its

Slump test of concrete is a measure of its consistency. 

Solution

A slump test is the easiest test to find out the workability of concrete. The slump test requires a very low cost and gives immediate results. The slump test of concrete is a measure of its consistency. According to IS 456, Values of slumps for different workability of concrete are represented below.

Degree of Workability	Very low	Low	Medium	High	Very High
Slump Value (in mm)	< 25	25-75	50-100	75-100	100-150

In a concrete slump test, slump is nothing but the difference between the height of the concrete before removing the slump cone and height of the concrete after removing of slump cone. Different types of slump are shown below.

• True Slump: In a real Slump, the concrete easily vanishes, keeping up the shape. This slump is used in several tests.
• Zero Slump: Here concrete maintains the actual shape of the mould and shows stiff, consistent and no workability.
• Collapsed slump: In this case, fresh concrete collapses entirely and the mix is too wet or high workability mix. Slump test isn’t suitable for such mix.
• Shear Slump: The shear Slump signifies that the result is incomplete, and the concrete needs to be tested again.. If a shear Slump or collapse is achieved, a new sample must be possessed, and the test is done again.

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