ACI Test Questions and Answers (2024/2025) (Complete and Accurate)

ACI Test Questions and Answers (2024/2025) (Complete and Accurate) The total time allowed between obtaining the first and final portions of a composite sample is 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) F Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the composite sample 5 minutes Begin molding test specimens within ______ minutes after obtaining the composite sample 15 minutes The concrete samples should be protected from 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 28 L (1 ft^3) The primary objective of the sampling process is to obtain a representative sample (T or F) T When sampling from a revolving drum truck mixer collect concrete from ______ portions of the batch 2 or more Wet sieving is performed when the concrete contains aggregates larger than appropriate for a test When sampling from a paving mixer it is not acceptable to place 3 small containers on the sub grade in order to obtain the required samples of concrete (T or F) F TEMPERATURE it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is greater than ___ 20min., 3in. The container for the concrete shall be large enough to provide at least ___ inches, or _____ of coarse agg, of concrete in all directions around the TMD 3in., 3 x NMS The temperature measuring device shall have the capability of measuring the temperature of the freshly mixed concrete to ± ______ oF accuracy and have a range of ______ to ______ oF. 1,30to120 A composite sample of concrete is not required even if the only purpose for obtaining the sample is to determine temperature. T or F T The Temperature Measuring Device used for determining concrete temperature must be calibrated ______ or whenever there is a question of accuracy. annually The temperature of freshly mixed concrete can be measured in all of the above Submerge the sensing portion of the thermometer at least ______ inches into the concrete 3 Gently press concrete around the thermometer such that the_______ does not affect the reading. ambient air temp The thermometer must remain in the concrete during the measurement for a minimum of ______ minutes. In addition, the temperature measurement must be completed within _______ minutes after obtaining the sample. 2, 5 The temperature of freshly mixed concrete is measured and recorded to the nearest _____ 1 degree SLUMP TEST