ACI Certification Concrete Field Technician Testing Grade 1 questions with correct answers

Testing Grade 1 questions with correct answers The volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate? Answer All types of aggregate What are the requirements for the tamping rod used in this test method? Answer Round, straight 5/8 [16mm] +/- 1/16 in. [2 mm] diameter rod at least 4 in. [300 mm] greater in length than the depth of the bowl being used, with the tamping end rounded to a hemispherical tip of the same diameter, made of steel, high-density polyethylene, or other plastic of equal or greater abrasion resistance. What are the requirements for the strike-off bar used in this test method? Answer Flat, straight steel bar at least 1/8 by 3/4 by 12in. [3 by 20 by 300 mm] or a flat, straight high-density polyethylene bar, or other plastic of equal or greater abrasion resistance, at least 1/4 by 3/4 by 12in. [6 by 20 by 300 mm]. What is the approximate volume of the measuring cup used to add water to the air meter, in relation to the volume of the air meter bowl? Answer 1.00% +/- 0.04% What type of alcohol and concentration must be used in this test method? Answer Isopropyl, 70% by volume (65% by weight) A mallet weighing ______ must be used to tap the sides of the bowl after rodding each layer. Answer 1.25 +/- 0.50 lb. (600 +/- 200g) The sample of concrete used in this test method must be obtained in accordance with what ASTM standard? Answer C172