Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
The slump test measures the consistency of fresh concrete on arrival: a metal cone is filled and lifted, and the drop of the concrete is measured in millimetres.
Why it matters on a project
It exposes added water or a wrong mix before the pour, while the truck can still be rejected.
Measurement and pricing
Recorded for each truck, together with cubes or cylinders taken for strength testing.
Common mistake
Testing after the pour has started, or only from the last part of the truck.
Frequently asked questions
What should the slump be?
The specification sets it by element and pouring method; the truck is rejected if the slump is outside the limits.
Does the slump test measure strength?
No, only consistency; strength comes from cube or cylinder tests.
Related terms
- Concrete grade (compressive strength)The characteristic compressive strength of concrete at 28 days, e.g. C30 or 300 kg/cm².
- CuringKeeping concrete moist and at temperature after pouring so it reaches its design strength.
- Quality control planThe list of inspections, tests and hold points for each activity and who approves them.
- Inspection request (IR)A formal request from the contractor to the consultant to inspect work before the next stage.
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