ACI Concrete Field Testing Technician Questions with Correct Answers
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 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
