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ACI Test 2023 Questions and Answers
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ACI Test 2023 Questions and Answers
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ACI Test 2023 Questions and Answers The total time allowed between obtaining the first and final portions of a composite sample is - Answer- 15 minutesWhen 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) - Answer- F
Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the composite sample - Answer- 5 minutes
Begin molding test specimens within ______ minutes after obtaining the composite sample - Answer- 15 minutes
The concrete samples should be protected from - 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 - Answer- 28 L (1 ft^3)
The primary objective of the sampling process is to obtain a representative sample (T or
F) - Answer- T
When sampling from a revolving drum truck mixer collect concrete from ______ portions
of the batch - Answer- 2 or more
Wet sieving is performed - 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) - Answer- F
TEMPERATURE - Answer- it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg
is greater than ___ - 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 - 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. - 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 - Answer- T
The Temperature Measuring Device used for determining concrete temperature must be calibrated ______ or whenever there is a question of accuracy. - Answer- annually
The temperature of freshly mixed concrete can be measured in - Answer- all of the above
Submerge the sensing portion of the thermometer at least ______ inches into the concrete - Answer- 3
Gently press concrete around the thermometer such that the_______ does not
affect the reading. - 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. - Answer- 2, 5
The temperature of freshly mixed concrete is measured and recorded to the nearest _____ - Answer- 1 degree
SLUMP TEST - Answer- ****The slump test does not provide an indication of the water content of a concrete mixture. - Answer- F
A slump mold can be fabricated from both plastic and metal. - Answer- T
****The length of the tamping for the slump test shall be approximately - Answer- The slump test is applicable to concrete having a coarse aggregate up to _______ inch in size. - Answer- 1.5 inches
The height of the slump cone is - Answer- 12 in
6. The exterior of the slump cone is tapped 10 to 15 times after rodding each layer. - Answer- F
The slump mold is filled with three layers of concrete - Answer- by volume
8. If the top surface of the concrete falls below the top of the slump cone while rodding the final layer of concrete, - Answer- stop, add concrete to maintain an excess, then continue the rod count from
where you left off.
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