ACI Concrete Field Testing
Technician- Grade I
The sensor of the temperature measuring device shall be submerged a minimum of _____
bb bb bb bb bb bb bb bb bb bb bb bb bb
in. [_____mm] into the freshly mixed concrete. - ANS>>3 in. [75 mm]
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The temperature measuring device shall have a capacity of measuring temperature of freshly
bb bb bb bb bb bb bb bb bb bb bb bb
mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. - ANS>>1
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The temperature measuring device shall be calibrated _____, or whenever there is a
bb bb bb bb bb bb bb bb bb bb bb bb
question of _____. - ANS>>Annually, accuracy
bb bb bb bb bb bb bb bb
The temperature of concrete may be measured in a wheelbarrow. True or False? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>True
bb
The temperature of concrete may be measured in a wall form. True of False - ANS>>True
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
A composite sample of concrete is required even if the only purpose for obtaining the
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
sample is to determine temperature. True of False? - ANS>>False
bb bb bb bb bb bb bb bb bb bb bb bb
What must be done to the sample container prior to sampling the concrete? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>Dampen (with water)
bb bb bb
What must be done to the concrete surrounding the temperature measuring device after the
bb bb bb bb bb bb bb bb bb bb bb bb bb
device is submerged in the fresh concrete. - ANS>>Gently press the concrete around the
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
temperature measuring device at the surface of the concrete
bb bb bb bb bb bb bb bb bb
How long must the temperature measuring device remain in the freshly mixed concrete? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>At least 2 minutes but not more than 5 minutes
bb bb bb bb bb bb bb bb bb bb
,ACI Concrete Field Testing
Technician- Grade I
After the temperature of the concrete is read, what is required? - ANS>>Reporting of
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
temperature
bb
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>1 degree F [0.5 C]
bb bb bb bb bb
According to ASTM C1064, what is one reason to take the temperature of concrete? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>Verify conformance to a specified requirement for temperature of concrete
bb bb bb bb bb bb bb bb bb bb
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of
bb bb bb bb bb bb bb bb bb bb bb bb bb
False? - ANS>>False
bb bb bb bb bb
The sample of concrete used for temperature determination must be rodded 25 times. True
bb bb bb bb bb bb bb bb bb bb bb bb bb
or False? - ANS>>False
bb bb bb bb bb bb
Sampling by this method is required when tests are to be made to determine _____ with
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
specification requirements. - ANS>>Compliance
bb bb bb bb bb bb
This method covers sampling from four types of mixtures which are _____, _____, _____,
bb bb bb bb bb bb bb bb bb bb bb bb bb
and _____. - ANS>>Stationary mixers, paving mixers, revolving drum mixers, and open top
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
mixers
bb
The maximum allowable time between obtaining the first and final portions of a composite
bb bb bb bb bb bb bb bb bb bb bb bb bb
sample is _____ minutes. - ANS>>15
bb bb bb bb bb bb bb bb
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
bb bb bb bb bb bb bb bb bb bb bb bb bb
sample. True of False? - ANS>>True
bb bb bb bb bb bb bb bb
, ACI Concrete Field Testing
Technician- Grade I
The maximum elapsed time allowed between obtaining the final portion of the composite
bb bb bb bb bb bb bb bb bb bb bb bb
sample and beginning the tests for slump, temperature, and air content is _____ minutes.
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
- ANS>>5
bb bb
The molding of strength test specimens shall begin within _____ minutes after fabricating
bb bb bb bb bb bb bb bb bb bb bb bb
the composite sample. - ANS>>15
bb bb bb bb bb bb bb
The concrete sample must be protected from contamination and _____. - ANS>>Rapid
bb bb bb bb bb bb bb bb bb bb bb bb bb
evaporation
bb
The minimum size sample for making strength test specimens is _____. - ANS>>28 L (1ft^3)
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
When sampling from a stationary mixer, the batch must be sampled at _____ or more
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
regularly spaced intervals during discharge of the middle portion of the batch - ANS>>2
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The composite sample for a paving mixer must represent a minimum of _____ different
bb bb bb bb bb bb bb bb bb bb bb bb bb
portions of the batch of concrete taken from the pile after discharge. - ANS>>5
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
of _____ regularly spaced intervals during discharge of the middle portion of this batch. -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>2
bb
Concrete samples from a truck mixer must be obtained before any water or admixtures are
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
added to the mixer at the job site. True or False? - ANS>>False
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The composite samples from a truck mixer must be obtained from the _____ portion of the
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
batch. - ANS>>Middle
bb bb bb bb bb
Technician- Grade I
The sensor of the temperature measuring device shall be submerged a minimum of _____
bb bb bb bb bb bb bb bb bb bb bb bb bb
in. [_____mm] into the freshly mixed concrete. - ANS>>3 in. [75 mm]
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The temperature measuring device shall have a capacity of measuring temperature of freshly
bb bb bb bb bb bb bb bb bb bb bb bb
mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. - ANS>>1
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The temperature measuring device shall be calibrated _____, or whenever there is a
bb bb bb bb bb bb bb bb bb bb bb bb
question of _____. - ANS>>Annually, accuracy
bb bb bb bb bb bb bb bb
The temperature of concrete may be measured in a wheelbarrow. True or False? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>True
bb
The temperature of concrete may be measured in a wall form. True of False - ANS>>True
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
A composite sample of concrete is required even if the only purpose for obtaining the
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
sample is to determine temperature. True of False? - ANS>>False
bb bb bb bb bb bb bb bb bb bb bb bb
What must be done to the sample container prior to sampling the concrete? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>Dampen (with water)
bb bb bb
What must be done to the concrete surrounding the temperature measuring device after the
bb bb bb bb bb bb bb bb bb bb bb bb bb
device is submerged in the fresh concrete. - ANS>>Gently press the concrete around the
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
temperature measuring device at the surface of the concrete
bb bb bb bb bb bb bb bb bb
How long must the temperature measuring device remain in the freshly mixed concrete? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>At least 2 minutes but not more than 5 minutes
bb bb bb bb bb bb bb bb bb bb
,ACI Concrete Field Testing
Technician- Grade I
After the temperature of the concrete is read, what is required? - ANS>>Reporting of
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
temperature
bb
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>1 degree F [0.5 C]
bb bb bb bb bb
According to ASTM C1064, what is one reason to take the temperature of concrete? -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>Verify conformance to a specified requirement for temperature of concrete
bb bb bb bb bb bb bb bb bb bb
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of
bb bb bb bb bb bb bb bb bb bb bb bb bb
False? - ANS>>False
bb bb bb bb bb
The sample of concrete used for temperature determination must be rodded 25 times. True
bb bb bb bb bb bb bb bb bb bb bb bb bb
or False? - ANS>>False
bb bb bb bb bb bb
Sampling by this method is required when tests are to be made to determine _____ with
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
specification requirements. - ANS>>Compliance
bb bb bb bb bb bb
This method covers sampling from four types of mixtures which are _____, _____, _____,
bb bb bb bb bb bb bb bb bb bb bb bb bb
and _____. - ANS>>Stationary mixers, paving mixers, revolving drum mixers, and open top
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
mixers
bb
The maximum allowable time between obtaining the first and final portions of a composite
bb bb bb bb bb bb bb bb bb bb bb bb bb
sample is _____ minutes. - ANS>>15
bb bb bb bb bb bb bb bb
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
bb bb bb bb bb bb bb bb bb bb bb bb bb
sample. True of False? - ANS>>True
bb bb bb bb bb bb bb bb
, ACI Concrete Field Testing
Technician- Grade I
The maximum elapsed time allowed between obtaining the final portion of the composite
bb bb bb bb bb bb bb bb bb bb bb bb
sample and beginning the tests for slump, temperature, and air content is _____ minutes.
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
- ANS>>5
bb bb
The molding of strength test specimens shall begin within _____ minutes after fabricating
bb bb bb bb bb bb bb bb bb bb bb bb
the composite sample. - ANS>>15
bb bb bb bb bb bb bb
The concrete sample must be protected from contamination and _____. - ANS>>Rapid
bb bb bb bb bb bb bb bb bb bb bb bb bb
evaporation
bb
The minimum size sample for making strength test specimens is _____. - ANS>>28 L (1ft^3)
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
When sampling from a stationary mixer, the batch must be sampled at _____ or more
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
regularly spaced intervals during discharge of the middle portion of the batch - ANS>>2
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The composite sample for a paving mixer must represent a minimum of _____ different
bb bb bb bb bb bb bb bb bb bb bb bb bb
portions of the batch of concrete taken from the pile after discharge. - ANS>>5
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
of _____ regularly spaced intervals during discharge of the middle portion of this batch. -
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
ANS>>2
bb
Concrete samples from a truck mixer must be obtained before any water or admixtures are
bb bb bb bb bb bb bb bb bb bb bb bb bb bb
added to the mixer at the job site. True or False? - ANS>>False
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
The composite samples from a truck mixer must be obtained from the _____ portion of the
bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb
batch. - ANS>>Middle
bb bb bb bb bb
