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ACI CERTIFICATION TEST/11 COMPLETE QUESTIONS WITH ANSWERS
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ACI CERTIFICATION TEST/11 COMPLETE QUESTIONS WITH ANSWERS
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ACI CERTIFICATION TEST/11COMPLETE QUESTIONS WITH
ANSWERS
What must occur before a sample of concrete can be taken from the
revolving drum mixer? - -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. - -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? - -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. - -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? - -28L
-What is the maximum allowable time between obtaining the first and final
portions of the composite sample? - -15 min
-What is required after the concrete sample has been transported to the
place where test are to be performed? - -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? - -Wet
sieving
-Start the tests from 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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