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ACI Concrete Oral Exam|11 Complete Questions and Answers
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ACI Concrete Oral Exam|11 CompleteQuestions and Answers
What must occur before a sample of concrete can be taken from a revolving
drum mixer? - -All water and admixtures must be added to the mixer
-When sampling from a stationary or revolving drum mixer, what is collected
and when is it taken during discharge? - --two or more portions of concrete
from the middle of the batch
-At regularly spaced intervals
-How are the sample portions obtained from the discharge stream of a
stationary or revolving drum mixer? - --Repeatedly pass a receptacle
through the entire discharge stream
-Completely divert the discharge stream into a sample container
-Describe the procedure for collecting a sample from a paving mixer - --
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 strength test specimens are
to be molded? - -28L (1ft^3)
-What is the maximum allowable time between obtaining the first and final
portions of the composite sample? - -15 min
-What action is required after the individual concrete samples have been
transported to the place where tests are to be performed? - -Combine and
remix the samples 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? - -wet
sieving
-Start the tests for slump, temperature, and air content within how many
minutes after obtaining the final portion of the composite sample? - -5 min
-Start molding specimens for strength tests within how many minutes after
fabricating the composite sample? - -15 min
-From what must the concrete sample be protected? - --Sun, wind and rapid
evaporation
-contamination
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