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

ACI Certification Exam Questions With Correct Answers Latest Updated 2024/2025 | Rated A+. 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'' 41. If the aggregate is too large, it must be ________________.Answer - Wet sieved over the 1 1/2" sieve 42. The minimum size of the measure is ________________________.Answer - Dependant upon the nominal maximum coarse aggregate size 43. At the end of the pressure method procedure, how is the pressure released from the Type B air meter?Answer - Opening both petcocks 46. T/F: ASTM 173 is appropriate for testing concretes containing lightweight aggregates.Answer - True 47. T/F: ASTM 173 specifies that at the very end of the test the tester must make sure that there are portions undisturbed in the bottom of the bowl, if so the test is valid.Answer - False 48. The maximum size aggregate for this test is _________.Answer - 1 1/2'' 49. If the second reading after rolling and rocking differs by more than 0.25% from the first, _______________.Answer - Rock and roll the meter again 50. You added 2 pints of alcohol to the roll-a-meter before you started. Your final reading after competing the test is 5.5% air. What is the recorded air reading?Answer - 5.5% air 52. T/F: Unless otherwise specified, strength test specimens molded from concrete having a slump less than 1" must be consolidated by vibration.Answer - True 54. Preparation of specimens for transport includesAnswer - Determining that at least 8 hours has elapsed since final set