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ACI WRITTEN EXAM QUESTIONS AND ANSWERS
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ACI WRITTEN EXAM QUESTIONS AND ANSWERS
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ACI WRITTEN EXAM QUESTIONS AND ANSWERSThe sensor of the temperature measureing device shall be submerged a minimum of
____ in - Answers -3 (75mm)
The temperature measureing device shall have a capacity of measuring temperature of
freshly mixed conrcrete to +-_____ degrees F throught a range of _____ - Answers -
1(.5 degrees C), 30-120 (0-50 degrees C)
The temperature measuring device shall be calibrated____, or whenever there is a
question of _____ - Answers -annually, accuracy
The temp of concrete may be measured in a wheelbarrow - Answers -true
the temp of concrete may be measured in a wall form - Answers -true
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temp. - Answers -false
What must be done to the sample container prior to sampling the concrete - Answers -
dampen (with water)
the molding of strength test specimens shall begin within ____ minutes after fabricating
the composite sample - Answers -15
The concrete sample must be protected from contamination and ____ - Answers -rapid
evaporation
The minimum size sample test specimen is - Answers -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 - Answers
-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 - Answers -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 - Answers -2
Concrete samples from a truck mixer must be obtained before any water or admixtures
are added to the mixer at the job site - Answers -False
The composite sample from a truck mixer must be obtained from the _____ portion of
the batch - Answers -Middle
, When the concrete contains aggregate larger than permitted for a particular test
method, the sample fo concrete must be ______ ______ before making the test -
Answers -Wet Sieved
The slump test is applicable to plastic concrete with a max aggregate size of ____ in -
Answers -1.5 in (37.5 mm)
When concrete contains aggregate larger than allowed for the slump test the large
aggregate must be - Answers -removed by wet sieving the sample over 1.5 in sieve
The mold for making the slump test is the shape of - Answers -the frustum of a cone
The height fo the slump mold is _____ in - Answers -12
The interior surface of the slump mold is allowed to have minor irregularities - Answers -
false
For use in the slump test, the end or both ends of the tamping rod must be - Answers -
rounded
the sample of concrete for use in making the slump test must be obtained in accordance
with ASTM standard ________ - Answers -C172 (Standard Practice for sampling freshly
mixed concrete
The slump mold should be in a dry condition before the beginning of the test - Answers -
false
the surface on which the slump mold will be placed must be _____ - Answers -flat, level
moist, nonabsorbent, free of vibration
The slump mold is filled in ____ layers - Answers -3
what must be done to the concrete surrounding the temp measuring device after the
device has submerged - Answers -Press concrete around measuring device
How long must the temp device remain in the concrete - Answers -at least 2 minutes
(but no more than 5)
After temp of concrete is read, what then is required - Answers -reporting of temp
the temp of concrete to be measured to the nearest ____degree F - Answers -1 (.5
degree C)
According to the ASTM C1064 what is one reason to take the temp of concrete -
Answers -verify conformance to a specified requirement for temp
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