ACI Certification Section 6 Exam | Comprehensive Questions and Answers Latest Updated 2024, Exams of Construction

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ACI Certification Section 6 Exam | Comprehensive Questions and Answers Latest Updated

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all types of aggregate - ✔✔The volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate?

• ✔✔What are the requirements for the tamping rod used in this test method?
• ✔✔What are the requirements for the strike-off bar used in this test method? 1.00 plus or minus .04% - ✔✔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? isopropyl, 70% by volume [65% by weight] - ✔✔What type of alcohol and concentration must be used in this test method? 1.25 plus or minus .5 lbs. - ✔✔A mallet weighing __________ must be used to tap the sides of the bowl after rodding each layer. C172 - ✔✔The sample of concrete used in this test method must be obtained in accordance with what ASTM practice? 1.5 inches - ✔✔The maximum size aggregate allowed in this test method is ... wet sieved over a 1 inch sieve - ✔✔If the concrete sample contains aggregate larger than that allowed for this test, the sample must be ... 2 - ✔✔When filling the measuring bowl of the air meter, the concrete must be placed in ______ layers of equal volume. 25 - ✔✔What is the specified number of strokes required when rodding each layer of concrete?

True - ✔✔It is necessary to tap the sides of the measuring bowl after each layer has been rodded. True or False. False - ✔✔The initial quantity of water and alcohol added to the air meter can be poured directly into the neck of the top section of the air meter. True or False. bottom of the meniscus - ✔✔Upon final filling of the air meter with water, what part of the liquid level should be adjusted to the zero mark on the meter? no more than 5 seconds at a time, but repeated for 45 seconds - ✔✔How long should the air meter be inverted and agitated? minimum of 2 maximum of 3 - ✔✔How many times does the rolling operation occur? to dispel any foam that may be on the surface of the water - ✔✔Why is the isopropyl alcohol added to the meter? .25% - ✔✔The direct reading of the final liquid level, in the neck of the air meter, is estimated to the nearest ... calibrated cups of water are added to bring liquid level within graduated range - ✔✔If the air content is greater than the 9% range of the meter ... True - ✔✔In order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must stabilize within 6 minutes, and the foam on the surface of the liquid must not be greater than 2 full percent divisions. True or False. False - ✔✔If less than 1.25 L [2.5 pt] of alcohol are used, the air content is always indicated by the final meter reading. True or False. a correction factor - ✔✔If more than 1.25 L [2.5 pt] of alcohol are used, the final meter reading is always adjusted using ...

higher - ✔✔When large amounts of alcohol are used, the direct reading will tend to indicate a _______ air content. disassembled and examined - ✔✔At the end of the procedure, the air meter is ... the test is invalid - ✔✔If portions of undisturbed concrete are found in the air meter at the end of the test ...