ACI Concrete Field Technician - Grade 1 Exam Questions and Answers 2024

ACI Concrete Field Technician - Grade 1 Exam Questions and Answers 2024 1. A 6 by 12 in [150 mm by 300 mm] cylinder mold can be used for concrete containing aggregate with particles not exceeding _____ in size, without the need for wet sieving the concrete. - Answer- 2 in. [50 mm] 2. According to ASTM C1064, what is one reason to take the temperature of concrete? - Answer- Verify conformance to a specified requirement for temperature of concrete 3. After completing the strike-off procedure, what must be done before weighing the measure and sample? - Answer- Clean off any excess concrete 4. After consolidation of the final layer, an excess of concrete ____ above the top of the measure is considered optimum. - Answer- 1/8 in. [3 mm] 5. After molding test specimens, you should wait two hours before moving them to the location of initial storage. True or False? - Answer- False; the specimens must be moved within 15 minutes 6. After rodding each layer, what should be done to the measure before adding another layer of concrete? - Answer- Tap the sides of the measure smartly 10 to 15 times with the mallet 7. After the final rodding, the sides of the slump mold should be tapped lightly with the tamping rod. True or False? - Answer- False 8. After the temperature of the concrete is read, what is required? - Answer- Reporting of temperature, record it. Sun, wind, contamination. 9. Air meter bowls used for this test must conform to ASTM _____ and be calibrated for volume according to ASTM _____. - Answer- C231, C29 10. The approximate concrete depth (in vertical distance) after placing the first layer is _____, and the second layer is _____. - Answer- 2 5/8 in. [70 mm], 6 1/8 in. [160 mm ] 11. ASTM Method gives standardized requirements for _____, _____, _____, and _____, of test specimens. - Answer- Making, curing, protecting, transporting. 12. At the end of the procedure, the air meter is _____. - Answer- Disassembled and its contents examined 13. The composite sample for a paving mixer 5 must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge. - Answer- 5 14. A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False? - Answer- False 15. The composite samples from a truck mixer must be obtained from the _____ portion of the batch. - Answer- Middle 16. Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have an initial curing temperature between - Answer- 68 and 78 degrees F [20 and 26 C] 17. The concrete sample must be obtained in accordance with what ASTM method? - Answer- C172 18. The concrete sample must be protected from contamination and _____. - Answer- Rapid evaporation