ACI Grade 1 Field Testing Certification Practice Test - 2024

ACI Grade 1 Field Testing Certification Practice Test - 2024 For concrete with aggregates less than 3 inches, the thermometer must remain in the fresh concrete sample a minimum of 5 minutes or until the temperature reading stabilizes. (T or F) -Answer-False (2-5 minutes) The temperature measuring device must be accurate to within 0.1 degree. (T or F) - Answer- The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete throughout a range of _____ to _____ degree F ( ______ to ______ degree C) -Answer-30 to 120 degree F ( 0 to 50 degree C) A composite sample is not needed if only the temperature test is being run. (T or F) - Answer-True The temperature of fresh concrete in a placement must be measured by inserting a thermometer into the top six inches of concrete. (T or F) -Answer-False (3 in.) The temperature of the concrete is recorded to the nearest ______ degree F (______ degree C) -Answer-1 degree F (0.5 degree C) ASTM C1064 states the container used to measure temperature of concrete must be large enough to provide at least 5 inches of concrete around the sensor. (T or F) - Answer- Calibrate the temperature measuring device at least __________, or whenever there is a question of accuracy. -Answer-Annually After the thermometer is placed in the concrete: -Answer-Gently press concrete around the thermometer According to ASTM C1064, what is one reason to take the temperature of concrete? - Answer-Verify conformance It is allowable to remove the temperature measuring devices from the freshly mixed concrete to read the temperature if you cannot see the reading. (T or F) -Answer-False The maximum allowable time between obtaining the first and last portions of the composite sample may not exceed 5 minutes. (T or F) -Answer-False Start molding specimens for strength tests within 30 minutes after fabricating the composite sample. (T or F) -Answer-False (15 mins) The composite concrete sample must be protected from sun, wind, contamination and rapid evaporation. (T or F) -Answer-False (Contamination and rapid evaporation) 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. (T or F) -Answer-False (wet screened) The composite sample not be remixed before beginning any tests. (T or F) -Answer- False Sampling should normally be performed, as the concrete is discharged from the mixer. (T or F) -Answer-True ASTM Method C172 includes the sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment. (T or F) -Answer-True After sampling is completed, start the tests for slump and air content within: -Answer- None of the above (5 mins)