ACI Certification Practice Exam
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-3
When 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
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-3
When 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
