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