ACI Concrete Field Testing
Technician- Grade I 150
QUESTIONS AND ANSWER
1. The sensor of the temperature measuring device shall be submerged a
minimum of _____ in. [_____mm] into the freshly mixed concrete.: 3 in. [75
mm]
2. The temperature measuring device shall have a capacity of measuring
temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C]
throughout a range of _____.: 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to
50 C]
3. The temperature measuring device shall be calibrated _____, or
whenever there is a question of _____.: Annually, accuracy
4. The temperature of concrete may be measured in a wheelbarrow. True or
False?: True
5. The temperature of concrete may be measured in a wall form. True of
False: True
6. A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temperature. True of False?: False 7.
What must be done to the sample container prior to sampling the concrete?:
Dampen (with water)
8. What must be done to the concrete surrounding the temperature measuring
device after the device is submerged in the fresh concrete.: Gently press the
concrete around the temperature measuring device at the surface of the concrete
, .
9. How long must the temperature measuring device remain in the
freshly mixed concrete?: At least 2 minutes but not more than 5 minutes
10. After the temperature of the concrete is read, what is required?: Reporting
of temperature
11. The temperature of concrete is reported to the nearest _____ degrees F
[_____ C]: 1 degree F [0.5 C]
12. According to ASTM C1064, what is one reason to take the temperature of
concrete?: Verify conformance to a specified requirement for temperature of
concrete
13. A maximum temperature of freshly mixed concrete is specified in ASTM
C1064. True of False?: False
14. The sample of concrete used for temperature determination must be
rodded 25 times. True or False?: False
15. Sampling by this method is required when tests are to be made to
determine _____ with specification requirements.: Compliance
16. This method covers sampling from four types of mixtures which are
_____, _____, _____, and _____.: Stationary mixers, paving mixers, revolving
drum mixers, and open top mixers
17. The maximum allowable time between obtaining the first and final portions
of a composite sample is _____ minutes.: 15
, .
18 Portions of a composite sample shall be thoroughly remixed bfore
beginning tests on the sample. True of False?: True
19. The maximum elapsed time allowed between obtaining the final portion
of the composite sample and beginning the tests for slump, temperature, and
air content is _____ minutes.: 5
20. The molding of strength test specimens shall begin within _____ minutes
after fabricating the composite sample.: 15
21. The concrete sample must be protected from contamination and _____.:
Rapid evaporation
22. The minimum size sample for making strength test specimens is _____.:
28 L (1ft^3)
23. When sampling from a stationary mixer, the batch must be sampled at
_____ or more regularly spaced intervals during discharge of the middle
portion of the batch: 2
24. The composite sample for a paving mixer must represent a minimum of
_____ different portions of the batch of concrete taken from the pile after
discharge.: 5
25. When sampling from a revolving drum truck mixer, concrete must be
sampled at a minimum of _____ regularly spaced intervals during discharge
of the middle portion of this batch.: 2
26. Concrete samples from a truck mixer must be obtained before any water
or admixtures are added to the mixer at the job site. True or False?: False 27.
The composite samples from a truck mixer must be obtained from the
_____ portion of the batch.: Middle
Technician- Grade I 150
QUESTIONS AND ANSWER
1. The sensor of the temperature measuring device shall be submerged a
minimum of _____ in. [_____mm] into the freshly mixed concrete.: 3 in. [75
mm]
2. The temperature measuring device shall have a capacity of measuring
temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C]
throughout a range of _____.: 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to
50 C]
3. The temperature measuring device shall be calibrated _____, or
whenever there is a question of _____.: Annually, accuracy
4. The temperature of concrete may be measured in a wheelbarrow. True or
False?: True
5. The temperature of concrete may be measured in a wall form. True of
False: True
6. A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temperature. True of False?: False 7.
What must be done to the sample container prior to sampling the concrete?:
Dampen (with water)
8. What must be done to the concrete surrounding the temperature measuring
device after the device is submerged in the fresh concrete.: Gently press the
concrete around the temperature measuring device at the surface of the concrete
, .
9. How long must the temperature measuring device remain in the
freshly mixed concrete?: At least 2 minutes but not more than 5 minutes
10. After the temperature of the concrete is read, what is required?: Reporting
of temperature
11. The temperature of concrete is reported to the nearest _____ degrees F
[_____ C]: 1 degree F [0.5 C]
12. According to ASTM C1064, what is one reason to take the temperature of
concrete?: Verify conformance to a specified requirement for temperature of
concrete
13. A maximum temperature of freshly mixed concrete is specified in ASTM
C1064. True of False?: False
14. The sample of concrete used for temperature determination must be
rodded 25 times. True or False?: False
15. Sampling by this method is required when tests are to be made to
determine _____ with specification requirements.: Compliance
16. This method covers sampling from four types of mixtures which are
_____, _____, _____, and _____.: Stationary mixers, paving mixers, revolving
drum mixers, and open top mixers
17. The maximum allowable time between obtaining the first and final portions
of a composite sample is _____ minutes.: 15
, .
18 Portions of a composite sample shall be thoroughly remixed bfore
beginning tests on the sample. True of False?: True
19. The maximum elapsed time allowed between obtaining the final portion
of the composite sample and beginning the tests for slump, temperature, and
air content is _____ minutes.: 5
20. The molding of strength test specimens shall begin within _____ minutes
after fabricating the composite sample.: 15
21. The concrete sample must be protected from contamination and _____.:
Rapid evaporation
22. The minimum size sample for making strength test specimens is _____.:
28 L (1ft^3)
23. When sampling from a stationary mixer, the batch must be sampled at
_____ or more regularly spaced intervals during discharge of the middle
portion of the batch: 2
24. The composite sample for a paving mixer must represent a minimum of
_____ different portions of the batch of concrete taken from the pile after
discharge.: 5
25. When sampling from a revolving drum truck mixer, concrete must be
sampled at a minimum of _____ regularly spaced intervals during discharge
of the middle portion of this batch.: 2
26. Concrete samples from a truck mixer must be obtained before any water
or admixtures are added to the mixer at the job site. True or False?: False 27.
The composite samples from a truck mixer must be obtained from the
_____ portion of the batch.: Middle
