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ACI Certification Exam Questions And Answers
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ACI Certification Exam Questions And AnswersQuiz :2. T/F: When the concrete contains large aggregate, the testing
technician should wet-sieve the sample before making unit weight tests for use
in yield computations. - Answer :False
Quiz :4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air
content, temperature, and slump tests. - Answer :True
Quiz :7. How do you regulate the rate of discharge of the batch from the
revolving truck drum mixer or agitator? - Answer :By the rate of revolution of
the drum
Quiz :10. While the technician is checking the slump of the concrete, there is a
decided falling away or shearing off of the concrete from one side of the
sample. What should the technician do? - Answer :Disregard the test and
retest on another portion of the sample
Quiz :11. The mold is filled in three equal layers by volume, which makes the
first third at _______, and the second third at ________. - Answer :2 5/8, 6 1/8
Quiz :15. What is the difference allowed by ACI when certifying an individual
test using a plastic slump cone vs. a metal slump cone? - Answer :0.5 inches
Quiz :16. T/F: The sides of the slump mold should be lightly tapped to
consolidate the concrete in the mold. - Answer :False
Quiz :18. T/F: ASTM C 1064 defines the maximum recommended temperature
for concrete. - Answer :False
Quiz :19. The temperature test method must be complete with in _________
after obtaining the sample. - Answer :5 minutes
Quiz :20. Each temperature-measuring device should be calibrated ________,
or whenever there is a question of _________. - Answer :annually, accuracy
Quiz :23. T/F: After strike off of the measure used to determine density, a
small quantity of concrete may be added to correct a deficiency? -
Answer :False
, Quiz :26. What is the required shape at the end of the tamping rod? -
Answer :rounded to a hemispherical tip
Quiz :28. How do you find the density of a concrete batch? - Answer :(mass of
measure with concrete - mass of measure) / volume of measure
Quiz :29. How do you find the yield of a concrete batch? - Answer :(mass of all
materials batched / (density of concrete * 27))
Quiz :33. T/F: Test method ASTM C231 is intended for use with all concretes
and aggregates for which an aggregate correction factor can be determined -
Answer :False
Quiz :34. T/F: The petcocks are closed before pumping any air into the
chamber on the type B meter. - Answer :False
Quiz :36. The sample is obtained in accordance to ASTM C ___________. -
Answer :172
Quiz :37. If the aggregate correction factor for a given source of fine and
coarse aggregate is found to be 0.2% in a pressure air meter, and an air
content value of 5.0% is read on the gauge of the same air meter containing
concrete with the same aggregate, what is the correct air content? -
Answer :4.8%
Quiz :39. If the sample is vibrated the duration of vibration should last
___________. - Answer :Until the surface concrete is smooth
Quiz :40. The maximum size aggregate for this test is _________. - Answer :2''
Quiz :41. If the aggregate is too large, it must be ________________. - Answer
:Wet sieved over the 1 1/2" sieve
Quiz :42. The minimum size of the measure is ________________________. -
Answer :Dependant upon the nominal maximum coarse aggregate size
Quiz :43. At the end of the pressure method procedure, how is the pressure
released from the Type B air meter? - Answer :Opening both petcocks
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