ACI Certification: Performance Checklist
15 minutes - ANS-Start molding specimens for strength tests within how many minutes after
fabricating the final portion of the composite sample?
15 minutes - ANS-What is the maximum allowable time between obtaining the first and final
portions of the composite sample?
28 L (1 cubic foot) - ANS-What is the minimum size for a sample when strength test specimens
are to be molded?
5 minutes - ANS-Start the tests for slump, temperature, and air content within how many
minutes after obtaining the final portion of the composite sample?
All water and admixtures must be added to the mixer. - ANS-What must occur before a sample
of concrete can be taken from a revolving drum mixer?
Combine and remix the samples with a shovel. - ANS-What action is required after the individual
concrete samples have been transported to the place where tests are to be performed?
Discharge the contents of the paving mixer. Obtain samples from at least five different portions
of the pile. - ANS-Describe the procedure for collecting a sample from a paving mixer.
In two or more portions of concrete, at regularly spaced intervals, and from the middle of the
batch. - ANS-When sampling from a stationary or revolving drum mixer, what is collected and
when is it taken during discharge?
Repeatedly pass a receptacle through the entire discharge stream. Completely divert the
discharge stream into a sample container. - ANS-How are the sample portions obtained from
the discharge stream of a stationary or revolving drum mixer?
Sun, wind, and rapid evaporation. Contamination. - ANS-From what must the concrete sample
be protected?
Wet sieving - ANS-What should be done if the concrete contains aggregate larger than is
appropriate for the size of the molds or the equipment being used?
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