ASTM C-1064 1 / 26 1. The technician must dampen the sample container with water prior to sampling of concrete A. False B. True 2 / 26 2. Complete the temperature measurement of freshly mixed concrete within................After obtaining the sample A. None B. 15 minutes C. 5 minutes D. 2.5 minutes 3 / 26 3. A maximum temperature of freshly mixed concrete is specified in ASTM C 1064. A. False B. True 4 / 26 4. The calibration of temperature measuring device shall be performed by comparing the readings off the temperature measuring device at two temperature at least : A. 32 degrees F ( 0 degrees C) B. 50 degrees F ( 10 degrees C) C. 1 degrees F ( 0.5 degrees C) D. 30 degrees F ( 15 degrees C) 5 / 26 5. The sample of concrete used for temperature determination must be rodded 25 time A. False B. True 6 / 26 6. The temperature measuring device shall be calibrated A. A or B (Annually or Whenever there is a question of accuracy) B. Whenever there is a question of accuracy C. prior to each use D. Annually 7 / 26 7. How long must the temperature measuring device remain in the freshly mixed concrete for an accurate reading ? A. Directly (No. specific time) B. at least 2 minutes but not more than 5 minutes. C. 30 Secondds. D. 2 minutes. 8 / 26 8. The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to ±.................degrees F(±............degrees C) throughout a range of..............to................degress A. 1 F (0.5 C) throughout a range of 0-120 F (0-50 C) B. 1 F (0.5 C) throughout a range of 30-120 F (0-50 C) C. None D. 0.5 F (1 C) throughout a range of 30-120 F (0-50 C) 9 / 26 9. It is not acceptable to measure the temperature of freshly mixed concrete in the transporting equipment or the forms after discharge. A. False. B. True. 10 / 26 10. Concrete containing aggregate of a nominal maximum size of greater than 3 in. (75 mm) may require up to 20 min for transfer of heat from aggregate to mortar. A. True B. False 11 / 26 11. Assuming the coarse aggregate size is less than 3 inches. complete the temperature test within .................minutes after obtaining the sample A. None B. 5 C. 2 D. 3 12 / 26 12. What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete? A. Gently press the concrete around the thermometer at the surface of the concrete B. A or B C. Nothing Must be done D. Gently remove the concrete around the temperature at the surface of the concrete 13 / 26 13. According to ASTM C 1064, What is one reason to take the temperature of concrete ? A. checking the theoretical concrete density B. Verify conformance to a specified requirement for temperature of concrete. C. None D. Measuring the air content in concrete. 14 / 26 14. Leave the temperature measuring device in the freshly mixed concrete for a minimum period off ..................min or until the temperature reading stabilizes. A. 20 B. 2 C. 3 D. 5 15 / 26 15. A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. A. True B. False 16 / 26 16. The sensor of the temperature measuring device shall have at least........in(...........mm) of concrete cover in all direction A. 1 in ( 25 mm) B. 3 in ( 75 mm) C. 2 in ( 50 mm) D. None 17 / 26 17. The temperature of freshly mixed concrete can be measured in : A. An adequately sized container. B. All of the above. C. The Transportation equipment. D. The form, after placement. 18 / 26 18. The concrete cover in the container must be at least three times the nominal maximum size the coarse aggregate A. False B. True 19 / 26 19. What special procedures are required when taking the temperature of concrete containing large size coarse aggregate ( Over 3 in (75 mm) A. May require a longer period of time, up to 20 minutes for the transfer of heat from the aggregate to the mortar B. None C. No special procedures are required D. waiting at least 30 minutes 20 / 26 20. The reference temperature measuring device shall be readable and accurate to............... A. ±0.5 F ( ± 0.2 C) B. None C. ±1 F ( ± 0.5 C) D. ±0.5 F ( ± 1 C) 21 / 26 21. When determining the temperature of fresh concrete, What is the minimum amount of concrete cover in all directions around the sensor of the temperature measuring device ? A. 5 in . ( 130 mm) B. 1 in . (25 mm) C. 3 in. (75 mm) D. 2 in . (50 mm) 22 / 26 22. Partial immersion liquid in glass thermometer shall have a permanent mark to which the device must be immersed without applying a correction factor. A. False B. True 23 / 26 23. Gently press concrete around the temperature measuring device so that..............does not affect the reading. A. Ambient (outside ) air temperature B. The sun C. The wind D. Bleed water 24 / 26 24. The temperature of concrete may be measured in a wheelbarrow A. True B. False 25 / 26 25. The temperature of concrete may be measured in a wall form ? A. False B. True 26 / 26 26. The temperature of the concrete is recorded to the nearest ; A. 0.5 degree F ( 0.5 degree C) B. 34 degree F ( 1 degree C) C. None D. 1 degree F ( 0.5 degree C) Loading your result Your score isThe average score is 50% 0% Restart quiz