ACI Concrete- Section 4 Exam All Possible Questions and Answers with complete solution

The diameter of the tamping rod used in this test method is ________. - Answer-16 mm (5/8") + or - 2 mm (1/16") What is the required shape of the tamping end of the rod - Answer-Rounded to Hemispherical tip What is the required minimum frequency of the vibrator used in this test method? - Answer-9000 vibrations per minute (150Hz) The outside diameter or side dimension of the vibrating element must be at least ______ but not greater than _______. - Answer-19 mm (3/4"), 38 mm (1-1/2") A plastic container can be used for the measure in this test method. - Answer-False, measure must be steel or other suitable metal What is the minimum thickness of a metal strike-off plate? - Answer-6 mm (1/4") What is the minimum thickness for a glass or acrylic strike-off plate? - Answer-12 mm (1/2") What is the specified weight of the mallet used on measures that are 14 L (0.5 cubic feet) or smaller? - Answer-600 + or - 200 g (1.25 + or - 0.5 lbs) Measures other than air meter bowls used for this test must conform to Test Method __________. - Answer-C29/C29M Air meter bowls used for this test must conform to Test Method ________ and calibrated for volume according to Test Method ________. - Answer-C231/C231M, C29/C29M The concrete sample must be obtained in accordance with what ASTM practice? - AnswerC172/C172M What method of consolidation must be used when the slump is greater than 3"? - Answer-RoddingWhat method must be used when the slump is less than 1"? - Answer-Vibration If rodding is the method of consolidation being used, the measure must be filled in how many layers? - Answer-Three For a measure of 14 L (0.5 cubic feet), what is the required number of strokes of the tamping rod for consolidation of each layer? - Answer-25