ACI Certification Practice Exam Questions And Answers

For 4x8 cylinders, how many layers and rod strokes to properly consolidate the concrete? - Answer-2 layers, 25 strokes For 6x12 cylinders, how many layers and rod strokes to properly consolidate the concrete? - Answer- 3 layers, 25 rod strokes After rodding each layer, the sides of the molds should be tapped 10-15 times with a tapping rod? T/F - Answer-False It should be done with a rubber mallet When rodding the second and/or third layers, the rod must go through the current ;layer and penetrate the previous layer approximately 1" - Answer-True While rodding the top layer and the concrete becomes low, additional concrete must be added before the 25th stroke - Answer-True A tamping rod, flow, or trowel can be used to produce a smooth flat level surface on top of the cylinders - Answer-Tamping rod, flow, trowel, all the above All of the above is correct When a strength specimen is used for acceptance testing, quality control testing, or trial batching a mix design, which type of curing method should be used - Answer-Standard lab cure when a strength specimen is used to determine when a structure can be put in the service or when shoring can be removed, which type of curing should be used? - Answer-Field cure Which three tests must always be performed when making test specimens? - Answer-Temperature, slump, air content Concrete should cover________ inches around the temperature sensor? - Answer-3When inserting the sensor into the sample, gently press concrete around the sensor. - Answer-True The temperature reading must be complete between _______ and ______ minutes - Answer-2 and 5 Read the temperature measurement to the nearest ______ Fahrenheit - Answer-1 degree The temperature sensor should be removed when reading it? - Answer-False The temperature measuring device shall be calibrated _________or whenever there is a question of_____________ - Answer--Annually -Correctness or accuracy The temperature device should be accurate to the nearest_______ fahrenheit and have a range of _____farenhite to _______ fahrenheit. - Answer-1 30 120 The maximum allowable sampling time between attaining the first and final portions of a composite sample is ____________ - Answer-15 minutes