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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: _______, ______, ______. |
Lightweight, air cooled, high porosity |
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What is the minimum allowable capacity of the measuring bowl used in this test method? |
.2 ft^3 or CF or 6.0L |
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What are the required characteristics of the tamping rod used in this test method? |
smooth, round, straight, rounded end, 5/8 diameter +- 1/16'' or 16mm +- 2mm |
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What is the specified size of the mallet required for this test method when the measuring bowl has a capacity of 14L [0.5CF] 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 Standard? |
C-172 |
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The maximum size aggregate allowed for this test method is _____ |
2'' |
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If the concrete contains aggregate larger than the maximum allowed for this test, the sample must be |
wet sieved |
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If the concrete is to be consolidated by rodding, the measure is filled in ____ layers |
3 layers |
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If the concrete sample is to be consolidated by vibration, the measure is filled in _____ layers |
2 layers |
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When rodding the concrete 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'' |
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In rodding the sample, how deep should the rod penetrate each layer? |
1'': bottom layer full depth |
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After rodding each layer what should be done to the measure before adding another layer of concrete? |
tap side measure 10-15 times |
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When consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer? |
3 |
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What tools may be used to strike off the top surface of concrete following consolidation of the final layer? |
strike off bar or strike off 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? |
small quantity of represented material 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 scoop or trowel prior to strike off |
