ACI Certification (Written test) ASTM C173 Volumetric

ACI Certification (Written test) ASTM C173 Volumetric the volumetric method of determining air content of concrete can be used on concrete containing what type of aggregate? all types of aggregates what are the requirements for the tamping rod used in this test method round, straight, 5/8, hemispherical what are the requirements for the strike of bar used in this test method flat steel, 1/8 x 3/4 x 12 in, made of high density polyethylene 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? 1.0 +- 0.04% what type of alcohol and concentration must be used in this test method 70% isopropyl a mallet weighing lbs must be used to tap the sides of the bowl after rodding each layer 1.25 +- 0.5 the sample of concrete used in this test method must be obtained in accordance with what astm practice C172 the maximum size aggregate allowed in this test method is 1 - 1/2" if the concrete sample contains aggregate larger than that allowed for this test, the sample must be wet sieved over 1" when filling the measuring bowl of the air meter, the concrete must be placed in 2 layers what is the specified number of stroke required when rodding each layer of concrete? 25 it is necessary to tap the sides of the measuring bowl after each layer has been rodded. True the initial quantity of water and alcohol added to air meter can be poured directly into the neck of the top section of the air meter. false Upon final filling of the air meter with water, what part of the liquid level should be adjusted to teh zero mark on the meter? Bottom of the meniscus how long should the air meter be inverted and agitated 45 sec, but no more than 5 sec @ a time how many times does the rolling operation occur? must 2x but can be 3x Why is the isopropyl alcohol added to the meter? to dispel any foam the direct reading of the final liquid level, in the neck of the air meter, is estimated to the nearest .25% is the air content is greater than the 9% range of the meter add water with calibrated cup in order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must be stabilized within 6 min, and the foam on the surface of the liquid must not be greater than 2 full percent divisions. true if less than 1.25 L [2.5 pt] of alcohol are used, the air content is always indicated by the final meter reading. false If more than 1.25 L [2.5 pt] of alcohol are used, the final meter reading is always adjusted using _________. a correction factor When large amounts of alcohol are used, the direct reading will tend to indicate a _____ air content. higher at the end of the procedure, the air meter is disassemble and examine content If portions of undisturbed concrete are found in the air meter at the end of the test, _____. the test is invalid