ACI CONCRETE FIELD TESTING
TECHNICIAN EXAM QUESTIONS WITH
COMPLETE SOLUTIONS GRADED A+
QUESTIONS AND ANSWERS
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete.. ANSWER -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
_____.. ANSWER -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 _____.. ANSWER -Annually, accuracy
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 of False.
ANSWER -True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False?. ANSWER -False
What must be done to the sample container prior to sampling the concrete?.
ANSWER -Dampen (with water)
,What must be done to the concrete surrounding the temperature measuring device
after the device is submerged in the fresh concrete.. ANSWER -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?. ANSWER -At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required?. ANSWER -Reporting
of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C].
ANSWER -1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete?.
ANSWER -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?. ANSWER -False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False?. ANSWER -False
Sampling by this method is required when tests are to be made to determine _____
with specification requirements.. ANSWER -Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____.. ANSWER -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.. ANSWER -15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False?. ANSWER -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.. ANSWER -5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample.. ANSWER -15
The concrete sample must be protected from contamination and _____.. ANSWER -
Rapid evaporation
The minimum size sample for making strength test specimens is _____.. ANSWER -
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.
ANSWER -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..
ANSWER -5
TECHNICIAN EXAM QUESTIONS WITH
COMPLETE SOLUTIONS GRADED A+
QUESTIONS AND ANSWERS
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete.. ANSWER -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
_____.. ANSWER -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 _____.. ANSWER -Annually, accuracy
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 of False.
ANSWER -True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False?. ANSWER -False
What must be done to the sample container prior to sampling the concrete?.
ANSWER -Dampen (with water)
,What must be done to the concrete surrounding the temperature measuring device
after the device is submerged in the fresh concrete.. ANSWER -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?. ANSWER -At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required?. ANSWER -Reporting
of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C].
ANSWER -1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete?.
ANSWER -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?. ANSWER -False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False?. ANSWER -False
Sampling by this method is required when tests are to be made to determine _____
with specification requirements.. ANSWER -Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____.. ANSWER -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.. ANSWER -15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False?. ANSWER -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.. ANSWER -5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample.. ANSWER -15
The concrete sample must be protected from contamination and _____.. ANSWER -
Rapid evaporation
The minimum size sample for making strength test specimens is _____.. ANSWER -
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.
ANSWER -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..
ANSWER -5
