ACI Concrete Field Testing Technician- Grade I questions with correct answers
Question : The sensor of the temperature measuring device
shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete.
Correct answer: 3 in. [75 mm]
Question : The temperature measuring device shall have a
capacity of measuring temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of
_____.
Correct answer: 1 degree F [0.5 C], 30 degrees F to 120 F [0
C to 50 C]
Question : The temperature measuring device shall be
calibrated _____, or whenever there is a question of _____.
Correct answer: Annually, accuracy
Question : The temperature of concrete may be measured in a
wheelbarrow. True or False?
Correct answer: True
Question : The temperature of concrete may be measured in a
wall form. True of False
Correct answer: True
Question : A composite sample of concrete is required even if
the only purpose for obtaining the sample is to determine temperature. True of False?
Correct answer: False
Question : What must be done to the sample container prior to
sampling the concrete?
Correct answer: Dampen (with water)
Question : What must be done to the concrete surrounding the
temperature measuring device after the device is submerged in the fresh concrete.
Correct answer: Gently press the concrete around the
temperature measuring device at the surface of the concrete
Question : How long must the temperature measuring device
remain in the freshly mixed concrete?
Correct answer: At least 2 minutes but not more than 5
minutes
Question : After the temperature of the concrete is read, what
is required?
Correct answer: Reporting of temperature
Question : The temperature of concrete is reported to the
nearest _____ degrees F [_____ C]
Correct answer: 1 degree F [0.5 C]
Question : According to ASTM C1064, what is one reason to
take the temperature of concrete?
Correct answer: Verify conformance to a specified
requirement for temperature of concrete
Question : A maximum temperature of freshly mixed concrete
is specified in ASTM C1064. True of False?
Correct answer: False
Question : The sample of concrete used for temperature
determination must be rodded 25 times. True or False?
Correct answer: False
Question : Sampling by this method is required when tests are
to be made to determine _____ with specification requirements.
Correct answer: Compliance
Question : This method covers sampling from four types of
mixtures which are _____, _____, _____, and _____.
Correct answer: Stationary mixers, paving mixers, revolving
drum mixers, and open top mixers