6.1 Concrete Slump Test

Definition

Slump is a measurement of concrete’s workability, or fluidity.

It’s an indirect measurement of concrete consistency or stiffness.

A slump test is a method used to determine the consistency of concrete. The consistency, or stiffness, indicates how much water has been used in the mix. The stiffness of the concrete mix should be matched to the requirements for the finished product quality

Concrete Slump Test

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.

Principle

The slump test result is a measure of the behaviour of a compacted inverted cone of concrete under the action of gravity. It measures the consistency or the wetness of concrete.

Types Of Slump

The slumped concrete takes various shapes, and according to the profile of slumped concrete, the slump is termed as;

Collapse Slump

Shear Slump

True Slump

slump slump slump

Collapse Shear Types of slump True slump