ACI Grade 1 Written Exam Questions with correct Answers | Latest Updated 2024

ACI Grade 1 Written Exam Questions with correct Answers | Latest Updated 2024 The temp. measuring device shall be capable of accurately measuring the temp. of freshly mixed concrete to ____ throughout a range of ____. - 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? - Answer ️️ -False C172/C172M covers sampling from five type of equipment which are___, ___, ___, ___, & ____? - Answer ️️ -revolving drum, stationary, paving, continuous, & open top The mold for making the slump test is in the shape of ____. - Answer ️️ -the frustum of a cone The surface on which the slump mold will be placed must be ____. - Answer ️️ -Flat, moist non-absorbent, & rigid How deep should the tamping rod penetrate each layer? - 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 ____. - Answer ️️ -the area surrounding the base of the mold What is the minimum frequency of the vibrator used in Test Method C138/C138M - Answer ️️ -9000 Vibrations/Min., 150 Hertz What is the minimum thickness of a metal strike-off plate used in Test Method C138/C138M? - Answer ️️ -1/4 in. What is the minimum thickness of a glass/acrylic strike-off plate used in Test Method C138/C138M? - Answer ️️ -1/2 in. Measures other than air meter bowls used for Test Method C138/C138M must conform to Test Method ___. - 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 ___. - Answer ️️ -C231, C29 The pressure method of determining air content can be used on concrete containing ___ ____ aggregate. - Answer ️️ -relatively dense The pressure method of determining air content cannot be used on concrete containing the following types of aggregate: ___, ___, & ___. - Answer ️️ -light weight, air-cooled blast furnace slag, & aggregate of high porosity What is the minimum allowable capacity of the measuring bowl used in Test Method C231/C231M? - Answer ️️ -6L (0.2ft^3) What are the required characteristics of the tamping rod used in Test Method C231/C231M? - Answer ️️ -Round, straight steel rod, w/ a 16 mm (5/8 in) +-2 mm (1/16 in) diameter, length of at least 100 mm (4 in) greater than the depth of the measuring bowl, but not greater than 600 mm (24 in) in overall length w/ the tamping end rounded to a hemispherical tip of the same diameter as the rod What is the specified size of the mallet required for Test Method C231/C231M when the measuring bowl has a capacity of 14 L (0.5 ft^3) or less? - Answer ️️ -1 & 1/4 lbs +-0.5 lbs The maximum size aggregate allowed for Test Method C231/C231M is ___. - Answer ️️ -2 in What tools maybe used to strike off the top surface of the concrete following consolidation of the final layer? - Answer ️️ -strike-off plate made of acrylic, glass, or metal What are the requirements of the strike off bar used in Test Method C173/C173M? - Answer ️️ -Flat straight steel bar at least 3 x 20 x 300 mm (1/8 x 3/4 x 12 in) or a flat straight high density polyethyline bar, or plastic of equal or greater abrasion resistance at least 6 x 20 x 300 mm (1/4 x 3/4 x 12 in) In Test Method C173/C173M, When filling the measuring bowl of the air meter, the concrete must be placed in _____ layers of equal volume. - Answer ️️ -2 The direct reading of the final liquid level, in the neck of the air meter is estimated to the nearest ____. - Answer ️️ -0.25% Practice C31/C31M gives standardized requirements for ____, ____, ____, & ____ of test specimens. - Answer ️️ -Making, curing, protecting, & transporting For cylinders with a diameter of 150 mm (6 in) or greater, the tamping rod must be a round, straight steel rod with a diameter of ___. - Answer ️️ -5/8 +-1/16 in The container for obtaining the concrete sample used in Practice C31 can be a ___, ___, or ___. - Answer ️️ -metal pan, wheelbarrow, or flat clean non absorbent mixing board. A 150 x 300 mm (6 x 12 in.) cylinder mold can be used for concrete containing aggregate with particles not exceeding ___ in size, without the need for wet sieving the concrete. - Answer ️️ - 2 in