ACI Written Exam Questions with
Verified Solutions
The sensor of the temperature measureing device shall be submerged a minimum of
____ in - ANSWER-3 (75mm)
The temperature measureing device shall have a capacity of measuring temperature of
freshly mixed conrcrete to +-_____ degrees F throught a range of _____ - ANSWER-
1(.5 degrees C), 30-120 (0-50 degrees C)
The temperature measuring device shall be calibrated____, or whenever there is a
question of _____ - ANSWER-annually, accuracy
The temp of concrete may be measured in a wheelbarrow - ANSWER-true
the temp of concrete may be measured in a wall form - ANSWER-true
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temp. - 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 temp measuring device after the
device has submerged - ANSWER-Press concrete around measuring device
How long must the temp device remain in the concrete - ANSWER-at least 2 minutes
(but no more than 5)
After temp of concrete is read, what then is required - ANSWER-reporting of temp
the temp of concrete to be measured to the nearest ____degree F - ANSWER-1 (.5
degree C)
According to the ASTM C1064 what is one reason to take the temp of concrete -
ANSWER-verify conformance to a specified requirement for temp
A max temp of concrete is specified in ASTM C1064 - ANSWER-False
The sample of concrete used for temp determination must be rodded 25 times -
ANSWER-False
, Sampling by this method is required when tests are to be made to determine ____ with
specification requirements - ANSWER-compliance
The method covers sampling from four types of mixers which are _____, _____, ____,
and _______ - ANSWER-stationary mixes, 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 before beginning tests on
the sample - ANSWER-True
The maximum elapsed time allowed between obtaining the final portion of the
composite sample and beginning the tests for slump, temp, 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 test specimen 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
the 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 - ANSWER-False
The composite sample from a truck mixer must be obtained from the _____ portion of
the batch - ANSWER-Middle
When the concrete contains aggregate larger than permitted for a particular test
method, the sample fo concrete must be ______ ______ before making the test -
ANSWER-Wet Sieved
Verified Solutions
The sensor of the temperature measureing device shall be submerged a minimum of
____ in - ANSWER-3 (75mm)
The temperature measureing device shall have a capacity of measuring temperature of
freshly mixed conrcrete to +-_____ degrees F throught a range of _____ - ANSWER-
1(.5 degrees C), 30-120 (0-50 degrees C)
The temperature measuring device shall be calibrated____, or whenever there is a
question of _____ - ANSWER-annually, accuracy
The temp of concrete may be measured in a wheelbarrow - ANSWER-true
the temp of concrete may be measured in a wall form - ANSWER-true
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temp. - 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 temp measuring device after the
device has submerged - ANSWER-Press concrete around measuring device
How long must the temp device remain in the concrete - ANSWER-at least 2 minutes
(but no more than 5)
After temp of concrete is read, what then is required - ANSWER-reporting of temp
the temp of concrete to be measured to the nearest ____degree F - ANSWER-1 (.5
degree C)
According to the ASTM C1064 what is one reason to take the temp of concrete -
ANSWER-verify conformance to a specified requirement for temp
A max temp of concrete is specified in ASTM C1064 - ANSWER-False
The sample of concrete used for temp determination must be rodded 25 times -
ANSWER-False
, Sampling by this method is required when tests are to be made to determine ____ with
specification requirements - ANSWER-compliance
The method covers sampling from four types of mixers which are _____, _____, ____,
and _______ - ANSWER-stationary mixes, 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 before beginning tests on
the sample - ANSWER-True
The maximum elapsed time allowed between obtaining the final portion of the
composite sample and beginning the tests for slump, temp, 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 test specimen 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
the 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 - ANSWER-False
The composite sample from a truck mixer must be obtained from the _____ portion of
the batch - ANSWER-Middle
When the concrete contains aggregate larger than permitted for a particular test
method, the sample fo concrete must be ______ ______ before making the test -
ANSWER-Wet Sieved
