ACI CONCRETE FIELD TESTING
TECHNICIAN- GRADE I WITH
UPDATED 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
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. - ANSWER-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? - ANSWER-False
The composite samples from a truck mixer must be obtained from the _____ portion of the batch. -
ANSWER-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. - ANSWER-Wet sieved
TECHNICIAN- GRADE I WITH
UPDATED 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
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. - ANSWER-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? - ANSWER-False
The composite samples from a truck mixer must be obtained from the _____ portion of the batch. -
ANSWER-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. - ANSWER-Wet sieved
