ACI Test questions with correct answers

The total time allowed between obtaining the first and final portions of a composite sample is Answer 15 minutes When it is necessary to wet sieve the concrete sample, wet sieving should be performed after the individual samples are remixed into a composite sample (T or F) Answer F Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the composite sample Answer 5 minutes Begin molding test specimens within ______ minutes after obtaining the composite sample Answer 15 minutes The concrete samples should be protected from Answer the sun, wind, and other sources of rapid evaporation, from contamination When test specimens are to be molded, the minimum size of sample obtained is Answer 28 L (1 ft^3) The primary objective of the sampling process is to obtain a representative sample (T or F) Answer T When sampling from a revolving drum truck mixer collect concrete from ______ portions of the batch Answer 2 or more