04/05/2026
Concrete Slump Test & Types Of Slump
The slump test is a simple method to measure the workability and consistency of fresh concrete.
Procedure (brief):
Concrete is placed in a cone (slump cone) in 3 layers, each tamped. The cone is lifted vertically, and the concrete subsides. The slump value (mm) is the difference in height before and after removal.
Types of Slump:
True Slump – Concrete settles evenly → good workability (ideal condition).
Shear Slump – One side slips → lack of cohesion, poor mix.
Collapse Slump – Concrete collapses completely → too much water (very wet mix).
Zero Slump – No change in height → very stiff/dry mix.
Typical Slump Range:
0–25 mm → Low workability
25–75 mm → Medium workability
75–150 mm → High workability
Purpose:
Ensures proper mix quality for safe and durable construction.
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