Exam (elaborations)
ACI CONCRETE FIELD TESTING TECHNICIAN- GRADE I
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ACI CONCRETE FIELD TESTING TECHNICIAN- GRADE I
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ACI CONCRETE FIELD TESTING TECHNICIAN- GRADE IThe sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - Answers -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
_____. - Answers -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 _____. - Answers -Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
Answers -True
The temperature of concrete may be measured in a wall form. True of False - Answers -
True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - Answers -False
What must be done to the sample container prior to sampling the concrete? - Answers -
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - Answers -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?
- Answers -At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - Answers -Reporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
Answers -1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
Answers -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? - Answers -False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? - Answers -False
, Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - Answers -Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. - Answers -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. - Answers -15
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? - Answers -False
The composite samples from a truck mixer must be obtained from the _____ portion of
the batch. - Answers -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. -
Answers -Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of
_____. - Answers -1.5 in. [37.5 mm]
When the concrete contains aggregate larger than allowed for the slump test, the large
aggregate must be _____. - Answers -Removed by wet sieving the sample over 1.5 in.
[37.5 mm] sieve
The mold for making the slump test is in the shape of _____. - Answers -The frustum of
a cone
The height of the slump mold is _____. - Answers -12 in. [300 mm]
The interior surface of the slump mold is allowed to have minor irregularities. True or
False? - Answers -False
For use in the slump test, the end or both ends of the tamping rod must be _____. -
Answers -Rounded to a hemispherical tip
The sample of concrete for use in making the slump test must be obained in
accordance with ASTM Standard _____. - Answers -C172, Standard Practice for
Sampling Freshly Mixed Concrete
The slump mold should be in a dry condition before beginning the test. True or False? -
Answers -False
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