Concrete slump is determined by measuring the distance between the sagged top of a molded concrete sample and _____.
a. the bottom of the concrete sample after it has spread out over a five-minute period
b. the surface of the bleed water that has collected inside the cone mold
c. the bottom of the tamping rod that was placed across the cone mold above the sample
d. a predetermined mark on a volumetric sight glass placed beside the sample
c. the bottom of the tamping rod that was placed across the cone mold above the sample
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