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ACI Test/84 Questions and Answers/Distinction Graded
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ACI Test/84 Questions andAnswers/Distinction Graded
The total time allowed between obtaining the first and final portions of a
composite sample is - -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) - -F
-Tests for slump, temperature, and air content must begin within ______
minutes after obtaining the composite sample - -5 minutes
-Begin molding test specimens within ______ minutes after obtaining the
composite sample - -15 minutes
-The concrete samples should be protected from - -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 - -28 L (1 ft^3)
-The primary objective of the sampling process is to obtain a representative
sample (T or F) - -T
-When sampling from a revolving drum truck mixer collect concrete from
______ portions of the batch - -2 or more
-Wet sieving is performed - -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) - -F
-TEMPERATURE - -
-it may require up to ___ min before the temp stabilizes when the NMS of the
coarse agg is greater than ___ - -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 -
-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. - -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 - -T
-The Temperature Measuring Device used for determining concrete
temperature must be calibrated ______ or whenever there is a question of
accuracy. - -annually
-The temperature of freshly mixed concrete can be measured in - -all of the
above
-Submerge the sensing portion of the thermometer at least ______ inches
into the concrete - -3
-Gently press concrete around the thermometer such that the_______ does
not
affect the reading. - -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. - -2, 5
-The temperature of freshly mixed concrete is measured and recorded to
the nearest _____ - -1 degree
-SLUMP TEST - -
-****The slump test does not provide an indication of the water content of a
concrete mixture. - -F
-A slump mold can be fabricated from both plastic and metal. - -T
-****The length of the tamping for the slump test shall be approximately - -
-The slump test is applicable to concrete having a coarse aggregate up to
_______ inch in size. - -1.5 inches
-The height of the slump cone is - -12 in
-6. The exterior of the slump cone is tapped 10 to 15 times after rodding
each layer. - -F
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