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ACI CERTIFICATION TEST -solved
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ACI CERTIFICATION TEST -solved
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ACI CERTIFICATION TEST -solvedWhat must occur before a sample of concrete can be taken from the revolving drum mixer? - Answer- All of the water must be added to the mixer
Describe the different procedures that can be used to collect a sample of concrete from a stationary or revolving drum mixer. - Answer- Repeatedly pass a receptacle through the entire discharge stream. Completely divert the discharge stream into a sample container.
What are the required steps for collecting a sample of concrete from a stationary or revolving drum mixer? - Answer- Collect two or more portions of concrete at regularly spaced intervals from the middle of the batch.
Describe the procedure for collecting a sample of pavement concrete deposited on grade. - Answer- Discharge the contents of the paving mixer. Obtain samples from at least five different portions of the pile
what is the minimum size for a sample when test specimens are to be molded? - Answer- 28L
What is the maximum allowable time between obtaining the first and final portions of the
composite sample? - Answer- 15 min
What is required after the concrete sample has been transported to the place where test
are to be performed? - Answer- Combine and remix the sample with a shovel
What should be done if the concrete contains aggregate larger than is appropriate for the size of the molds or equipment being used? - Answer- Wet sieving
Start the tests from slump, temperature, and air content within how many minutes after obtaining the final portion of the composite sample? - Answer- 5 min
Start molding specimens for strength tests within how many minutes after fabricating the
composite sample? - Answer- 15 min
From what must the concrete sample be protected? - Answer- Sun, wind, and rapid evaporation. Contamination.
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