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ACI Concrete Oral Exam 2023 Questions and Answers
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ACI Concrete Oral Exam 2023 Questions and Answers
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ACI Concrete Oral Exam 2023 Questionsand Answers What must occur before a sample of concrete can be taken from a revolving drum mixer? - Answer- 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? - Answer- -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? - Answer- -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 - 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 strength test specimens are to be molded? - Answer- 28L (1ft^3)
What is the maximum allowable time between obtaining the first and final portions of the
composite sample? - Answer- 15 min
What action is required after the individual concrete samples have been transported to the place where tests are to be performed? - Answer- 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? - Answer- wet sieving
Start the tests for 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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