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ACI Test C172 Exam/13 Questions and Answers/100% Accurate
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ACI Test C172 Exam/13 Questionsand Answers/100% Accurate
Sampling by this practice covers procedures for obtaining representative
samples, on which tests are to be performed to determine ___ with quality
requirements of the specifications under which the concrete is furnished. - -
conformance
-This practice covers sampling from four types of mixers, which are
___________, ___________, __________, and __________. - -Stationary, Paving,
Revolving drum truck, and Continuous
-Concrete samples from a truck mixer must be obtained before any water or
admixtures are added to the mixer at the job site. (T/F) - -F
-Portions of a composite sample shall be thoroughly remixed before
beginning tests on the sample. (T/F) - -T
-The elapsed time between obtaining the first and final portions of a
composite sample shall not exceed _____ minutes. - -15
-Start the tests for slump, temperature, and air content within _____ minutes
after obtaining the final portion of the composite sample. - -5
-Start molding specimens for strength tests within _____ minutes after
fabricating the composite sample. - -15
-The concrete sample must be protected from _____ and _____ - -
contamination, evaporation
-The minimum size sample for making strength test specimens is _____ - -1
cubic foot
-When sampling from a stationary mixer, the batch must be sampled at
_____ or more regularly spaced intervals during the discharge of the middle
_____% of the batch. - -2, 80
-When sampling from a revolving drum truck mixer, concrete must be
sampled at a minimum of _____ regularly spaced intervals during discharge
of the middle _____% of this batch. - -2, 80
-When sampling from a paving mixer, obtain samples from at least _____
different portions of the pile and combine into one composite sample. - -5
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