ACI Concrete Field Testing Technician- Grade I
1. The sensor of the temperature measuring device shall be submerged a minimum of: ️ 3 in. [75
mm] into the freshly mixed concrete.
2. The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concrete t...
ACI Concrete Field Testing Technician- Grade I
1. The sensor of the temperature measuring device shall be submerged a minimum of: ✔️ 3 in. [75
mm] into the freshly mixed concrete.
2. The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concrete to ±: ✔️ 1 degree F [0.5 C], throughout a range of: ✔️ 30 degrees F to 120 F [0 C to 50 C].
3. The temperature measuring device shall be calibrated: ✔️ Annually, or whenever there is a question
of: ✔️ accuracy.
4. The temperature of concrete may be measured in a wheelbarrow. ✔️ True
5. The temperature of concrete may be measured in a wall form. ✔️ True
6. A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. ✔️ 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: ✔️ 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. ✔️ False
14. The sample of concrete used for temperature determination must be rodded 25 times. ✔️ False
15. Sampling by this method is required when tests are to be made to determine: ✔️ Compliance with
specification requirements.
16. This method covers sampling from four types of mixers which are: ✔️ 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: ✔️ 15 minutes.
18. Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample.
✔️ 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: ✔️ 5 minutes.
20. The molding of strength test specimens shall begin within: ✔️ 15 minutes after fabricating the
composite sample.
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 (1 ft³).
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