ACI Certification Exam Questions With Correct Answers | Latest Updated 2024/2025 | Scored A+

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 4. T/F: Samples smaller than 28L (1 .) are allowed on routine air content, temperature, and slump tests.Answer - True 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 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 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 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 16. T/F: The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold.Answer - False 18. T/F: ASTM C 1064 defines the maximum recommended temperature for concrete.Answer - False 19. The temperature test method must be complete with in _________ after obtaining the sample.Answer - 5 minutes ACI Certification Exam Questions With Correct Answers | Latest Updated 2024/2025 | Scored A+ 20. Each temperature-measuring device should be calibrated ________, or whenever there is a question of _________.Answer - annually, accuracy 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 26. What is the required shape at the end of the tamping rod?Answer - rounded to a hemispherical tip 28. How do you find the density of a concrete batch?Answer - (mass of measure with concrete - mass of measure) / volume of measure 29. How do you find the yield of a concrete batch?Answer - (mass of all materials batched / (density of concrete * 27)) 33. T/F: Test method ASTM C231 is intended for use with all concretes and aggregates for which an aggregate correction factor can be determinedAnswer - False 34. T/F: The petcocks are closed before pumping any air into the chamber on the type B meter.Answer - False 36. The sample is obtained in accordance to ASTM C ___________.Answer - 172 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% 39. If the sample is vibrated the duration of vibration should last ___________.Answer - Until the surface concrete is smooth 40. The maximum size aggregate for this test is _________.Answer - 2''