ACI Test Questions with Complete
Solutions9
The total time allowed between obtaining the first and final portions of a composite sample is -
ANSWERS-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) - ANSWERS-F
Tests for slump, temperature, and air content must begin within ______ minutes after obtaining
the composite sample - ANSWERS-5 minutes
Begin molding test specimens within ______ minutes after obtaining the composite sample -
ANSWERS-15 minutes
The concrete samples should be protected from - ANSWERS-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 - ANSWERS-28
L (1 ft^3)
The primary objective of the sampling process is to obtain a representative sample (T or F) -
ANSWERS-T
When sampling from a revolving drum truck mixer collect concrete from ______ portions of the
batch - ANSWERS-2 or more
, Wet sieving is performed - ANSWERS-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) - ANSWERS-F
TEMPERATURE - ANSWERS-
it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is
greater than ___ - ANSWERS-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 - ANSWERS-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. - ANSWERS-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 - ANSWERS-T
The Temperature Measuring Device used for determining concrete temperature must be
calibrated ______ or whenever there is a question of accuracy. - ANSWERS-annually
The temperature of freshly mixed concrete can be measured in - ANSWERS-all of the above
Submerge the sensing portion of the thermometer at least ______ inches into the concrete -
ANSWERS-3
Solutions9
The total time allowed between obtaining the first and final portions of a composite sample is -
ANSWERS-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) - ANSWERS-F
Tests for slump, temperature, and air content must begin within ______ minutes after obtaining
the composite sample - ANSWERS-5 minutes
Begin molding test specimens within ______ minutes after obtaining the composite sample -
ANSWERS-15 minutes
The concrete samples should be protected from - ANSWERS-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 - ANSWERS-28
L (1 ft^3)
The primary objective of the sampling process is to obtain a representative sample (T or F) -
ANSWERS-T
When sampling from a revolving drum truck mixer collect concrete from ______ portions of the
batch - ANSWERS-2 or more
, Wet sieving is performed - ANSWERS-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) - ANSWERS-F
TEMPERATURE - ANSWERS-
it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is
greater than ___ - ANSWERS-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 - ANSWERS-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. - ANSWERS-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 - ANSWERS-T
The Temperature Measuring Device used for determining concrete temperature must be
calibrated ______ or whenever there is a question of accuracy. - ANSWERS-annually
The temperature of freshly mixed concrete can be measured in - ANSWERS-all of the above
Submerge the sensing portion of the thermometer at least ______ inches into the concrete -
ANSWERS-3
