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18 Cards in this Set
- Front
- Back
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The pressure method of determining air content can be used on concrete containing ____ aggregate. |
Relatively dense |
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The pressure method of determining air content cannot be used on concrete containing the following types of aggregate: ____,_____,_____. |
Light weight aggregate, Air cooled blast furnace slag, aggregate of high porosity. |
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What is the minimum allowable capacity of the measure bowl used in this test method? |
6.0L 0.20 ft3 |
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What are the required characteristics of the tamping rod used in this test method? |
Rounded to hemispherical tip. |
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What is the specified size of the mallet required for this test method when the measure bowl has a capacity of 14 L (0.5ft3) or less? |
1.25 +- .5 lbs |
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The sample of concrete used for this test is to be obtained in accordance with what ASTM practice? |
C172/C172M |
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The maximum size aggregate allowed for this test method is ____. |
2" 50mm |
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If the concrete contains aggregate larger than the maximum allowed for this test, the sample must be ____? |
Wet sieved over a 1.5" sieve |
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If the concrete sample is to be consolidated by rodding, the measure is filled in ___ layers. |
3 |
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If the concrete sample is to be consolidated by vibration, the measure is filled in ____ layers. |
2 |
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When rodding the sample, what is the specified number of strokes required for each layer? |
25 |
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Vibration of the concrete sample is not allowed when the slump of the concrete exceeds____. |
3" (75mm) |
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In rodding the sample, how deep should the rod pentetrate each layer? |
Rod bottom layer to full depth, rod middle and top layer penetrating previous layer 1 inch |
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After rodding each layer, what should be done to the measure before adding another layer of concrete? |
Smartly tap sides 10 -15 times with mallet |
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When consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer? |
3 times |
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What tools may be used to strike off the top surface of the concrete following consolidation of the final layer? |
Strike off bar, a metal glass or acrylic plate |
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What must be done if there is a slight deficiency in the quantity of concrete in the measure following consolidation of the final layer. |
A small quantity of concrete may be added. |
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What must be done if there is an excessive amount of concrete in the measure following consolidation of the final layer? |
Remove excess with trowel or scoop before striking off. |
