ACI Concrete Field Testing Technician-
Graded A
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - ANS-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
_____. - ANS-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 _____. - ANS-Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANS-True
The temperature of concrete may be measured in a wall form. True of False - ANS-True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - ANS-False
What must be done to the sample container prior to sampling the concrete? - ANS-
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - ANS-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?
- ANS-At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - ANS-Reporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
ANS-1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
ANS-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? - ANS-False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? - ANS-False
If rodding is the method of consolidation being used, the measure must be filled in how
many layers? - ANS-3
For a measure of 0.5 ft^3 [14 L], what is the required number of strokes of the tamping
rod for consolidation of each layer? - ANS-25
When rodding the middle and the top layers, the tamping rod should penetrate into the
layer below approximately _____. - ANS-1 in. [25 mm]
If vibration is the method of consolidation, the measure must be filled in _____
approximately equal layers. - ANS-2
If, after consolidation of the final layer, the concrete level is 1/2 in. (13 mm) above the
top of the measure, what should be done? - ANS-Remove a representative portion of
the excess concrete with a trowel or scoop
After consolidation of the final layer, an excess of concrete ____ above the top of the
measure is considered optimum. - ANS-1/8 in. [3 mm]
After completing the strike-off procedure, what must be done before weighing the
measure and sample? - ANS-Clean off any excess concrete
The pressure method of determining air content can be used on concrete containing
_____ _____ aggregate. - ANS-Relatively Dense
The pressure method of determining air content cannot be used on concrete containing
the following types of aggregates, _____, _____, _____. - ANS-Lightweight, air-cooled
blast furnace slag, or aggregates of high porosity
What is the minimum allowable capacity of the measuring bowl used in this test
method? - ANS-6 L (0.20 ft^3)
What are the required characteristics of the tamping rod used in this test method? -
ANS-Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16 in.] diameter, length
at least 100 mm [4 in.] greater than the depth of the measuring bowl, but not greater
than 600 mm [24 in.] in overall length, with the tamping end rounded to a hemispherical
tip of the same diameter as the rod.
Graded A
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - ANS-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
_____. - ANS-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 _____. - ANS-Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANS-True
The temperature of concrete may be measured in a wall form. True of False - ANS-True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - ANS-False
What must be done to the sample container prior to sampling the concrete? - ANS-
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - ANS-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?
- ANS-At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - ANS-Reporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
ANS-1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
ANS-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? - ANS-False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? - ANS-False
If rodding is the method of consolidation being used, the measure must be filled in how
many layers? - ANS-3
For a measure of 0.5 ft^3 [14 L], what is the required number of strokes of the tamping
rod for consolidation of each layer? - ANS-25
When rodding the middle and the top layers, the tamping rod should penetrate into the
layer below approximately _____. - ANS-1 in. [25 mm]
If vibration is the method of consolidation, the measure must be filled in _____
approximately equal layers. - ANS-2
If, after consolidation of the final layer, the concrete level is 1/2 in. (13 mm) above the
top of the measure, what should be done? - ANS-Remove a representative portion of
the excess concrete with a trowel or scoop
After consolidation of the final layer, an excess of concrete ____ above the top of the
measure is considered optimum. - ANS-1/8 in. [3 mm]
After completing the strike-off procedure, what must be done before weighing the
measure and sample? - ANS-Clean off any excess concrete
The pressure method of determining air content can be used on concrete containing
_____ _____ aggregate. - ANS-Relatively Dense
The pressure method of determining air content cannot be used on concrete containing
the following types of aggregates, _____, _____, _____. - ANS-Lightweight, air-cooled
blast furnace slag, or aggregates of high porosity
What is the minimum allowable capacity of the measuring bowl used in this test
method? - ANS-6 L (0.20 ft^3)
What are the required characteristics of the tamping rod used in this test method? -
ANS-Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16 in.] diameter, length
at least 100 mm [4 in.] greater than the depth of the measuring bowl, but not greater
than 600 mm [24 in.] in overall length, with the tamping end rounded to a hemispherical
tip of the same diameter as the rod.
