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ACI Grade 1 Written Exam- 49 Questions and Answers
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ACI Grade 1 Written Exam- 49 Questions andAnswers
The temp. measuring device shall be capable of accurately measuring the
temp. of freshly mixed concrete to ____ throughout a range of ____. - -1
Degree F, 30-120 Degrees F
-A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine the temp. T or F? - -False
-C172/C172M covers sampling from five type of equipment which are___,
___, ___, ___, & ____? - -revolving drum, stationary, paving, continuous, &
open top
-The mold for making the slump test is in the shape of ____. - -the frustum
of a cone
-The surface on which the slump mold will be placed must be ____. - -Flat,
moist non-absorbent, & rigid
-How deep should the tamping rod penetrate each layer? - -Rod each layer
throughout it's depth , on second & final layer the rod should penetrate into
the previous layer approximately 1 in.
-Prior to lifting the mold, concrete must be removed from ____. - -the area
surrounding the base of the mold
-What is the minimum frequency of the vibrator used in Test Method
C138/C138M - -9000 Vibrations/Min., 150 Hertz
-What is the minimum thickness of a metal strike-off plate used in Test
Method C138/C138M? - -1/4 in.
-What is the minimum thickness of a glass/acrylic strike-off plate used in
Test Method C138/C138M? - -1/2 in.
-Measures other than air meter bowls used for Test Method C138/C138M
must conform to Test Method ___. - -C29/C29M
-Air meter bowls used for Test Method C138/C138M must conform to Test
Method ___ and be calibrated for volume according to Test Method ___. - -
C231, C29
-The pressure method of determining air content can be used on concrete
containing ___ ____ aggregate. - -relatively dense
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