ACI Test- 100% Correctly Answered 2024

ACI Test- 100% Correctly Answered 2024 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 Wet sieving is performed -Answer-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) -Answer-F TEMPERATURE -Answer- it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is greater than ___ -Answer-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 -Answer-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. -Answer-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 -Answer-T The Temperature Measuring Device used for determining concrete temperature must be calibrated ______ or whenever there is a question of accuracy. -Answer-annually The temperature of freshly mixed concrete can be measured in -Answer-all of the above Submerge the sensing portion of the thermometer at least ______ inches into the concrete -Answer-3 Gently press concrete around the thermometer such that the_______ does not affect the reading. -Answer-ambient air temp