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ACI Concrete Field Testing Technician - Grade 1 (18) Exam Questions with correct Answers
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ACI Concrete Field Testing Technician - Grade 1 (18) Exam Questions with correct Answers ASTM C1064 - Answer- Standard Test Method For Temperature of Freshly Mixed Hydraulic-Cement ConcreteThe end of the temperature sensing portion of the temperature measuring device shall be submerged a minimum of ____ into the freshly mixed concrete. - Answer- 3 inches [75 mm] C1064, Sec. 8.1
The temperature measuring device shall have a capacity of measuring the temperature of freshly mixed concrete to ± ____ °F (± ____ °C) throughout a range of ____ °F ( ____
°C). - Answer- ±1 °F (±0.5 °C) ; 30 to 120 °F (0 to 50 °C) C1064, Sec. 5.2
The temperature measuring device shall be calibrated ____ , or whenever there is a question of ____ . - Answer- annually, accuracy
C1064, Sec. 6.1
The temperature of concrete may be measured in a wheelbarrow. True or False - Answer- True
The temperature of concrete may be measured in a wall form. True or False - Answer- True
C1064, Sec. 7.1
A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True or False - Answer- False
C1064, Sec. 7.2.2
What must be done to the sample container prior to sampling the concrete? - Answer- Dampen with water
C1064, Sec. 7.2.1 What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete? - Answer- Close off air voids by gently pressing the concrete around the device
C1064, Sec. 8.1
How long must the temperature measuring device remain in the freshly mixed concrete?
- Answer- minimum of two minutes, maximum of five minutes
C1064, Sec. 8.2
After the temperature of the concrete is read, what is then required? - Answer- Reporting of temperature
C1064, Sec. 9.1
The temperature of the concrete is reported to the nearest ____ °F - Answer- 1 °F (0.5 °C)
C1064, Sec. 9.1
According to Test Method C1064, what is one reason to take the temperature of concrete? - Answer- Verify conformance to a specified requirement for temperature of concrete
C1064, Sec. 4.1
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False - Answer- False
The sample of concrete used for temperature determination must be rodded 25 times. True or False - Answer- False
C1064, Sec. 7 & 8
ASTM C172 - Answer- Standard Practice for Sampling Freshly Mixed Concrete
Sampling by this practice covers procedures for obtaining representative samples, on which tests are to be performed to determine ____ with quality requirements of the specifications under which the concrete is furnished. - Answer- compliance C172, Sec. 1.1
This practice covers sampling from five types of equipment, which are ____, ____, ____, ____, and ____. - Answer- stationary mixers, paving mixers, revolving drum mixers, continuous mixers, and open top mixers C172, Sec. 5.2.1 - 5.2.4
The maximum allowable time between obtaining the first and final portions of a composite sample shall not exceed ____ . - Answer- 15 minutes
C172, Sec. 4.1
Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. True or False? - Answer- True
C172, Sec. 4.1.1
Start tests for slump, temperature, and air content within ____ after obtaining the final portion of the composite sample? - Answer- 5 minutes
C172, Sec. 4.1.2
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. - Answer- 5 minutes
C172, Sec. 4.1.2
Start molding specimens for strength tests within ____ after fabricating the composite sample. - Answer- 15 minutes C172, Sec. 4.1.2
The concrete sample must be protected from contamination and ____ . - Answer- rapid evaporation
C172, Sec. 4.1.2
The minimum size sample for making strength test specimens is ____ . - Answer- 1 ft³ [28 L]
C172, Sec. 5.1
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. - Answer- two
C172, Sec. 5.2.1
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