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ACI Concrete Field Testing Technician Questions and Correct Answers, With Complete Verified Solution 2024/2025.
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ACI Concrete Field Testing Technician Questions and Correct Answers, With Complete Verified Solution 2024/2025. The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. 3 in. [75 mm] The temperature measuring device sha...

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  • March 5, 2024
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  • 2023/2024
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ACI Concrete Field Testing Technician Questions
and Correct Answers, With Complete Verified Solution
2024/2025.
The sensor of the temperature measuring device shall be submerged a minimum
of _____ in. [_____mm] into the freshly mixed concrete.
3 in. [75 mm]
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]
The temperature measuring device shall be calibrated _____, or whenever there is
a question of _____.
Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False?
True
The temperature of concrete may be measured in a wall form. True of False
True
A composite sample of concrete is required even if the only purpose for obtaining
the sample is to determine temperature. True of False?
False
What must be done to the sample container prior to sampling the concrete?
Dampen (with water)
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
How long must the temperature measuring device remain in the freshly mixed
concrete?
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required?
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C]
1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of
concrete?
Verify conformance to a specified requirement for temperature of concrete
A maximum temperature of freshly mixed concrete is specified in ASTM C1064.
True of False?
False
The sample of concrete used for temperature determination must be rodded 25
times. True or False?
False

, Sampling by this method is required when tests are to be made to determine
_____ with specification requirements.
Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____.
Stationary mixers, paving mixers, revolving drum mixers, and open top mixers
The maximum allowable time between obtaining the first and final portions of a
composite sample is _____ minutes.
15
Portions of a composite sample shall be thoroughly remixed bfore beginning
tests on the sample. True of False?
True
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
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample.
15
The concrete sample must be protected from contamination and _____.
Rapid evaporation
The minimum size sample for making strength test specimens is _____.
28 L (1ft^3)
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
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
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
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
The composite samples from a truck mixer must be obtained from the _____
portion of the batch.
Middle
When the concrete contains aggregate larger than that permitted for a particular
test method, the sample of concrete must be _____ _____ before making the test.
Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of
_____.
1.5 in. [37.5 mm]

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