ACI TEST QUESTIONS WITH CORRECT
ANSWERS 2025
The total time allowed between obtaining the first and final portions of a composite sample is - CORRECT
ANSWER -15 minutes
When it is necessary to wet sieve the concrete sample, wet sieving should be performed after the
individual samples are remixed into a composite sample (T or F) - CORRECT ANSWER -F
Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the
composite sample - CORRECT ANSWER -5 minutes
Begin molding test specimens within ______ minutes after obtaining the composite sample - CORRECT
ANSWER -15 minutes
The concrete samples should be protected from - CORRECT ANSWER -the sun, wind, and other sources
of rapid evaporation, from contamination
When test specimens are to be molded, the minimum size of sample obtained is - CORRECT ANSWER -28
L (1 ft^3)
The primary objective of the sampling process is to obtain a representative sample (T or F) - CORRECT
ANSWER -T
When sampling from a revolving drum truck mixer collect concrete from ______ portions of the batch -
CORRECT ANSWER -2 or more
Wet sieving is performed - CORRECT ANSWER -when the concrete contains aggregates larger than
appropriate for a test
When sampling from a paving mixer it is not acceptable to place 3 small containers on the sub grade in
order to obtain the required samples of concrete (T or F) - CORRECT ANSWER -F
, TEMPERATURE - CORRECT ANSWER -
it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is greater than
___ - CORRECT ANSWER -20min., 3in.
The container for the concrete shall be large enough to provide at least ___ inches, or _____ of coarse
agg, of concrete in all directions around the TMD - CORRECT ANSWER -3in., 3 x NMS
The temperature measuring device shall have the capability of measuring the temperature of the freshly
mixed concrete to ± ______ oF accuracy and have a
range of ______ to ______ oF. - CORRECT ANSWER -1,30to120
A composite sample of concrete is not required even if the only purpose for obtaining the sample is to
determine temperature. T or F - CORRECT ANSWER -T
The Temperature Measuring Device used for determining concrete temperature must be calibrated
______ or whenever there is a question of accuracy. - CORRECT ANSWER -annually
The temperature of freshly mixed concrete can be measured in - CORRECT ANSWER -all of the above
Submerge the sensing portion of the thermometer at least ______ inches into the concrete - CORRECT
ANSWER -3
Gently press concrete around the thermometer such that the_______ does not
affect the reading. - CORRECT ANSWER -ambient air temp
The thermometer must remain in the concrete during the measurement for a minimum of ______
minutes. In addition, the temperature measurement must be completed within _______ minutes after
obtaining the sample. - CORRECT ANSWER -2, 5
The temperature of freshly mixed concrete is measured and recorded to the nearest _____ - CORRECT
ANSWER -1 degree
ANSWERS 2025
The total time allowed between obtaining the first and final portions of a composite sample is - CORRECT
ANSWER -15 minutes
When it is necessary to wet sieve the concrete sample, wet sieving should be performed after the
individual samples are remixed into a composite sample (T or F) - CORRECT ANSWER -F
Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the
composite sample - CORRECT ANSWER -5 minutes
Begin molding test specimens within ______ minutes after obtaining the composite sample - CORRECT
ANSWER -15 minutes
The concrete samples should be protected from - CORRECT ANSWER -the sun, wind, and other sources
of rapid evaporation, from contamination
When test specimens are to be molded, the minimum size of sample obtained is - CORRECT ANSWER -28
L (1 ft^3)
The primary objective of the sampling process is to obtain a representative sample (T or F) - CORRECT
ANSWER -T
When sampling from a revolving drum truck mixer collect concrete from ______ portions of the batch -
CORRECT ANSWER -2 or more
Wet sieving is performed - CORRECT ANSWER -when the concrete contains aggregates larger than
appropriate for a test
When sampling from a paving mixer it is not acceptable to place 3 small containers on the sub grade in
order to obtain the required samples of concrete (T or F) - CORRECT ANSWER -F
, TEMPERATURE - CORRECT ANSWER -
it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is greater than
___ - CORRECT ANSWER -20min., 3in.
The container for the concrete shall be large enough to provide at least ___ inches, or _____ of coarse
agg, of concrete in all directions around the TMD - CORRECT ANSWER -3in., 3 x NMS
The temperature measuring device shall have the capability of measuring the temperature of the freshly
mixed concrete to ± ______ oF accuracy and have a
range of ______ to ______ oF. - CORRECT ANSWER -1,30to120
A composite sample of concrete is not required even if the only purpose for obtaining the sample is to
determine temperature. T or F - CORRECT ANSWER -T
The Temperature Measuring Device used for determining concrete temperature must be calibrated
______ or whenever there is a question of accuracy. - CORRECT ANSWER -annually
The temperature of freshly mixed concrete can be measured in - CORRECT ANSWER -all of the above
Submerge the sensing portion of the thermometer at least ______ inches into the concrete - CORRECT
ANSWER -3
Gently press concrete around the thermometer such that the_______ does not
affect the reading. - CORRECT ANSWER -ambient air temp
The thermometer must remain in the concrete during the measurement for a minimum of ______
minutes. In addition, the temperature measurement must be completed within _______ minutes after
obtaining the sample. - CORRECT ANSWER -2, 5
The temperature of freshly mixed concrete is measured and recorded to the nearest _____ - CORRECT
ANSWER -1 degree
