Concrete slump / slump test A concrete slump test measures the consistency and workability of freshly mixed concrete before placement. The test indicates how easily the concrete can be placed and finished without measuring its strength directly.
During the test, fresh concrete is placed into a standard cone-shaped mold that is lifted vertically, allowing the concrete to settle. The amount it drops, or "slump," provides an indication of workability. A slump that is too high or too low may signal that the mix needs adjustment before placement, helping maintain consistent construction quality.
Frequently Asked Questions About Concrete slump / slump test
What is a slump test?
A field test measuring the consistency and workability of freshly mixed concrete before placement.
How is it performed?
Fresh concrete is packed into a standard cone mold, the cone is lifted, and the distance the concrete settles is measured as the slump.
Does slump measure strength?
No. It indicates workability only. Strength is verified separately through cylinder testing.
What does an out-of-range slump indicate?
Too high often signals excess water, which reduces final strength. Too low means the concrete may be difficult to place and consolidate properly.