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14 Cards in this Set
- Front
- Back
Sampling by this method is required when tests are to be made to determine _______ with specification requirements |
compliance |
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This method covers sampling from four types of mixers which are |
Open top, revolving drum, paving mixer, stationary mixer |
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The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes |
15 minutes |
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Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. T or F? |
True |
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The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature and air content is ______ minutes |
5 minutes |
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The molding of strength test specimens shall begin within ______ minutes after fabricating the composite same |
15 minutes |
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The concrete sample must be protected from contamination and |
evaporation, sun and wind |
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the minimum size sample for making strength test specimens is |
28L or 1ft^3 |
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When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch |
2 |
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The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge |
5 |
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When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of ______ regularly spaced intervals during discharge of the middle portion of the batch |
2 |
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Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. T or F |
False |
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The composite sample from a truck mixer must be obtained from the _____ portion of the batch. |
Middle |
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When the concrete contains aggregates larger than that permitted for a particular test method, the sample of concrete must be ____ ______ before making the test |
Wet sieved |