ACI- Concrete Field-Testing Technician - Grade 1 (Working knowledge of seven basic field tests) latest update 2024

ACI- Concrete Field-Testing Technician - Grade 1 (Working knowledge of seven basic field tests) latest update 2024 Q1. Start molding specimens for strength tests within 30 minutes after fabricating the composite sample. A. True B. False - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER-A. True ASTM C172- Para (6.1) Q5. The composite sample should not be remixed before beginning any tests. A. True B. False - CORRECT 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 - CORRECT ANSWER-B. False ASTM C172-Para (5). NOTE 2—Sampling should normally be performed as the