A simple field test that measures how wet and workable fresh concrete is by seeing how much a cone-shaped sample slumps down.
A field test used to measure the consistency and workability of fresh concrete by filling a standard cone-shaped mold, removing it, and measuring the vertical drop (slump) of the concrete. Higher slump indicates a wetter, more workable mix; lower slump is stiffer. ASTM C143 governs the procedure; typical slumps range from 2 to 5 inches for structural concrete.
The inspector rejected the first two loads because slump tests showed 8-inch slump, well above the 5-inch specification maximum.
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