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ACI Certification Practice Exam|40 Questions and Answers (ACI Certification Practice Exam)
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ACI Certification Practice Exam|40Questions and Answers (ACI Certification
Practice Exam)
For 4x8 cylinders, how many layers and rod strokes to properly consolidate
the concrete? - -2 layers, 25 strokes
-For 6x12 cylinders, how many layers and rod strokes to properly
consolidate the concrete? - -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 - -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" - -True
-While rodding the top layer and the concrete becomes low, additional
concrete must be added before the 25th stroke - -True
-A tamping rod, flow, or trowel can be used to produce a smooth flat level
surface on top of the cylinders - -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 - -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? - -Field cure
-Which three tests must always be performed when making test specimens?
- -Temperature, slump, air content
-Concrete should cover________ inches around the temperature sensor? - -3
-When inserting the sensor into the sample, gently press concrete around
the sensor. - -True
-The temperature reading must be complete between _______ and ______
minutes - -2 and 5
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