ACI Grade 1 Written Exam 50 Questions with Correct Answers Graded A+!!!The temp. measuring device shall be capable of accurately measuring the temp. of freshly mixed concrete to ____ throughout a range of ____. - Correct Answer 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? - Correct Answer False C172/C172M covers sampling from five type of equipment which are___, ___, ___, ___, & ____? - Correct Answer revolving drum, stationary, paving, continuous, & open top The mold for making the slump test is in the shape of ____. - Correct Answer the frustum of a cone The surface on which the slump mold will be placed must be ____. - Correct Answer Flat, moist non-absorbent, & rigid How deep should the tamping rod penetrate each layer? - Correct Answer 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 ____. - Correct Answer the area surrounding the base of the mold What is the minimum frequency of the vibrator used in Test Method C138/C138M - Correct Answer 9000 Vibrations/Min., 150 Hertz What is the minimum thickness of a metal strike-off plate used in Test Method C138/C138M? - Correct Answer 1/4 in.What is the minimum thickness of a glass/acrylic strike-off plate used in Test Method C138/C138M? - Correct Answer 1/2 in.Measures other than air meter bowls used for Test Method C138/C138M must conform to Test Method ___. - Correct Answer 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 ___. - Correct Answer C231, C29 The pressure method of determining air content can be used on concrete containing ___ ____ aggregate. - Correct Answer relatively dense
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