Term
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Definition
| Standard Pratice for Reducing Samples of Aggregate to Testing Size |
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Term
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Definition
| Reducing Samples of Aggregate to Testing Size |
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Term
| Larger samples will tend... |
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Definition
| to be more representative of the total supply |
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Term
| The Standard Pratice for Reducing Samples of Aggregate to Testing Size provides... |
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Definition
| procedures for reducing the large sample obtained in the field or produced in the laboratory to a convenient size for conducting a number of tests to describe the material and measure its quality in a manner that the smaller test sample portion is most likely to be a representation of the larger sample. |
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Term
| The circumstances that reduction in size of the sample prior to testing is not recommended, in which the entire original sample should be tested... |
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Definition
1-Case of an aggregate having relatively few large size particles in the sample
2-Test sample is being examined for certain contaminates occurring as a few discrete fragments in only small percentages. |
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Term
| Fine aggregate that is saturated-surface-dry(ssd) may be reduced by method(s) |
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Definition
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Term
| Fine aggregate that has free moisture on the particle surfaces may be reduced by method(s) |
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Definition
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Term
| If method B or C is desired and the sample does not have free moisture on the particle surfaces you may... |
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Definition
| moisten the sample to obtain free moisture on the particle surfaces, mix thoroughly, and then reduce the sample size. |
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Term
| If method A is desired and the sample has free moisture on the particle surfaces you may... |
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Definition
Dry the entire sample to at lest the saturated-surface-dry condition, using tempartures that do not exceed thoes specified for any of the test contemplated, and then reduce the sample size.
If the sample is very large you make make a preliminary split using a mechanical splitter with opnings of 38mm(1-1/2in) or more to reduce the sample to not less than 5000g, then dry |
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Term
| If fine aggregate will retain its shape when molded in the hand, it may be considered to be... |
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Definition
| wetter than saturated-surface-dry |
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Term
| Method using a Sample splitter-mechanical device with even number of equal width chutes. |
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Definition
| Method A - Mechanical Splitter |
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Term
| Sample splitters shall have not less than a total of _____ chutes for coarse aggregate or _____ for fine aggregate. |
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Definition
8 chutes for coarse aggregate;
12 chutes for fine aggregate |
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Term
| Sample Splitter-For coarse aggregate the minimum width of the chutes shall be approximately ___ larger than the ________ in the sample to be split. |
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Definition
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Term
| Sample Splitter-For dry fine aggregate in which the entire sample will pass the 9.5mm(3/8in) seive, a splitter haveing chutes ______ to ______ wide shall be used |
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Definition
| 12.5 to 20mm (1/2 to 3/4in) |
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Term
| Procedure for using a Sample Splitter |
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Definition
1-Place the original sample in the hopper or pan and uniformly distribute it from edge to edge.
2-Introduce the sample at a rate so as to allow it to flow freely through the chutes and into the receptacles below.
3-Reintroduce the portion of the sample in one of the receptacles into the splitter as many times as necessary to reduce the sample to the size specified. |
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Term
| Method using a straight-edged scoop, shovel, or trowel; a broom or brush and possably a canvas blanket |
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Definition
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Term
| Procedure for Method B - Quartering |
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Definition
1-Place sample on hard, clean, level surface.
2-Mix the material thoroughly by turning the sample over three times.
3-With the last turning, shovel the entire sample into a conical pile by depositing each shovelful on top of the preceding one.
4-Flatten the pile to a uniform thickness and diameter.
5-Quarter the pile
6-Remove two opposite quarters
7-Mix the remaining quarters
8-Repeat until sample is reduced to desired size. |
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Term
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Definition
| use a canvas blanket if a hard, flat, & level surface is not available. |
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Term
| Procedure for Method C - Miniature Stockpile |
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Definition
1-Place original sample of damp fine aggregate on a hard clean, level surface.
2-Mix the material thoroughly by turning the entire sample over three times.
3-With the last turning, shovel the entire sample into a conical pile by depositing each shovelful on top of the preceding one.
4-Flatten the conical pile to a uniform thickness by pressing down the apex
5-Obtain a sample by selecting at least five increments of material at random locations from the pile. |
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