ACI Certification Exam questions with correct answers

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 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