ACI- Concrete Field -Testing Technician - Grade 1 Exam Questions a nd Answers 100% Pass Q1. Start molding specimens for strength tests within 30 minutes after fabricating the composite sample. A. True B. False - Answer - B. False ASTM C172 -Para (4.1.2) - Start molding. specimens for strength tests within 15 min after fabricating the composite sample. Q2. The maximum allowable time between obtaining the first and last portions of the composite sample may not exceed 5 minutes. A. True B. False - Answer - B. False ASTM C172 - Para (4.1) - The elapsed time shall not exceed 15 min. between obtaining the first and final portions of the composite sample. Q3. The composite concrete sample must be protected from sun, wind, contamination and rapid evaporation. A. True B. False - Answer - A. True ASTM C172 - Para (4.1.2) Q4. If the concrete contains aggregates larger than those that are appropriate for a size of mold or equipment used, the sample should be wet sieved before making the test. A. True B. False - Answer - A. True ASTM C172 - Para (6.1) Q5. The composite sample should not be remixed before beginning any tests. A. True B. False - Answer - B. False ASTM C172 -Para (4.1.1) -The sample shall be combined and remixed with a shovel the minimum amount necessary to ensure uniformity and compliance with the maximum time limits Q6. Sampling should normally be performed, as the concrete is discharged from the mixer. A. True B. False - Answer - B. False ASTM C172 -Para (5). NOTE 2 —Sampling should normally be performed as the concrete is delivered from the mixer. To the conveying vehicle used to transport the concrete to the forms; however, specifications may require other points of sampling, such as the discharge of a concrete pump. Q7. ASTM Method C172 includes sampling from stationary mixers, paving mixers, truck mixers, agitators, and non -agitating equipment. A. True B. False - Answer - A. True ASTM C172 - Para (1.1) Q8. After sampling is completed, start the tests for slump and air content within: A. 2 ½ minutes B. 10 minutes C. 15 minutes D. None of the above - Answer - D. None of the above ASTM C172 - Para (4.1.2) Start tests for slump, temperature, and air content within 5 min after obtaining the final portion of the composite sample. Q9. In any case, do not obtain samples until: A. All the water and admixtures have been added to the concrete B. 200 revolutions of the drum have been obtained C. ½ of the water has been added D. None of the above - Answer - A. All the water and admixtures have been added to the concrete. ASTM C172 - Para (5.2.3). In any case do not obtain samples until after all of the water has been added to the mixer. Q10. No samples shall be taken before_________ or after_________ of the batch has been discharged. A. 10% or after 90% B. 20% or after 90% C. 20% or after 80% D. None of the above - Answer - A. 10% or after 90%
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