Term
| The volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate? |
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Definition
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Term
| What are the requirements for the tamping rod used in this test method? |
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Definition
Round, smooth, straight 5/8 in. ± 1/16 in. diameter rod
At least 4 in. but not greater than 24 in.
Both ends rounded to a hemispherical tip, made of steel, high density polyethylene, or other plastic of equal or greater abrasion resistance. |
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Term
| What are the requirements for the strike-off bar used in this test method? |
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Definition
Flat, straight steel bar at least 1/8 by 3/4 by 12in. or
High density polyethylene or other plastic 1/4 by 3/4 by 12in. |
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Term
| 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? |
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Definition
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Term
| What type of alcohol and concentration must be used in this test method? |
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Definition
| Isopropyl 70% by volume (65% by weight) |
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Term
| A mallet weighing _____ must be used to tap the outside of the bowl after rodding each layer. |
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Definition
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Term
| The sample of concrete used in this test method must be obtained in accordance with what ASTM standard? |
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Definition
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Term
| The maximum size aggregate allowed in this test method is ____. |
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Definition
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Term
| The maximum size aggregate allowed in this test method is ____. |
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Definition
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Term
| If the concrete sample contains aggregate larger than that allowed for this test, the sample must be ______. |
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Definition
| Wet- sieved over a 1 in. sieve. |
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Term
| When filling the measuring bowl of the air meter, the concrete must be placed in ____ layers of equal volume. |
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Definition
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Term
| What is the specified number of strokes required when rodding each layer of concrete? |
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Definition
| Each layer should be rodded 25 times no more, no less... for an industry standard. |
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Term
| Its is necessary to tap the sides of the measuring bowl after each layer has been rodded. True or False? |
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Definition
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Term
| 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? |
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Definition
| False, the funnel must be used. |
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Term
| Upon the final filling of the air meter with water, what part of the liquid level should be adjusted to the zero mark on the meter? |
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Definition
| The bottom of the meniscus. |
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Term
| How long should the air meter be inverted and agitated? |
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Definition
| invert no more than 5s at a time repeated for a minimum of 45s to free concrete from the base. |
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Term
| How many times does the rolling operation occur? |
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Definition
Minimum of two
Maximum of three |
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Term
| Why is the isopropyl alcohol added to the meter? |
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Definition
| To dispel any foam that may be on the surface of the water |
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Term
| The direct reading of the final liquid level, in the neck of the air meter, is estimated to the nearest ____. |
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Definition
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Term
| If the air content is greater than the 9% range of the meter, ____. |
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Definition
| Calibrated cups of water are added to bring the liquid level within the graduated range. |
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Term
| In order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must stabilize within 6 min., and the foam on the surface of the liquid must not be greater than 2 full percent divisions. True or False? |
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Definition
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Term
| 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? |
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Definition
| False, if the air content is more than 9% , the number of calibrated cups of water introduced into the meter to bring the liquid level within the graduated range must be added. |
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Term
| If more than 2.5 pt of alcohol are used, the final meter reading is always adjusted using _____. |
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Definition
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Term
| When large amounts of alcohol are used , the direct reading will tend to indicate a ____ air content. |
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Definition
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Term
| At the end of the procedure, the air meter is ____. |
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Definition
Opened and examined for any undisturbed concrete.
Disassembled and examined. |
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Term
| If portions of undisturbed concrete are found in the air meter at the end of the test, ______. |
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Definition
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