What does a slump test measure?

• A. The workability or consistency of fresh concrete.
• B. The air content of fresh concrete.
• C. The color uniformity of the mix.
• D. The final strength after curing.

Answer: (A)

The slump test measures the workability or consistency of fresh concrete. It gauges how easily the concrete can be placed, consolidated, and finished by testing how much the concrete “slumps” or subsides when the specimen is removed from the molds. A higher slump means a more workable, flowable mix, while a low slump indicates a stiffer mix that’s harder to place.

This test is performed on fresh concrete using a slump cone, with the concrete packed in layers, the cone lifted, and the subsidence measured. The result helps you adjust water content or admixtures to achieve the desired workability for the specific placing and finishing conditions, and it’s a quick quality check between batches.

It does not measure air content, color uniformity, or final strength after curing (those require different tests).