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Miniature Stockpile Sampling Method for the reduction of damp fine samples of aggregate to the appropriate size for testing employing techniques that are intended to minimize variations in measured characteristics between the test samples so selected and the large sample.
There are three methods for the reduction of large bulk samples of aggregate to an appropriate size for testing where variations in measured characteristics between the test sample and the large bulk sample are minimized.
00:32 Method A
Method A is using a riffle-type mechanical splitter or universal splitter. Method B is process called quartering. And Method C is a procedure called miniature stockpile sampling.
The Mechanical Splitter Apparatus
Sample splitters for aggregate should have an even number of alternating equal-width chutes, with a minimum of 8 chutes for coarse aggregates and 12 chutes for fine aggregates, which discharge sample material alternately to each side of the splitter. With the minimum width of the individual chutes being at least 2 to 3 times larger than the largest particles in the sample being reduced.
00:47 Method B
The quartering method is generally used in situations where an adequate mechanical splitter is unavailable or when there is free moisture on the particle surfaces of the bulk samples.
01:04 Method C
The miniature stockpile sampling method is only for sampling damp fine aggregate and is not permitted for sampling of coarse aggregates or mixtures of coarse and fine aggregates.
01:19 The Miniature Stockpile Sampling Method Apparatus
The apparatus for the miniature stockpile sampling method shall consist of a straight-edged scoop, shovel, or trowel for mixing the aggregate, and either small scoop, or spoon for sampling.
01:50 Sample Reducing Procedure for Method C
Place the original sample of damp fine aggregate on a hard clean, level surface where the potential for material loss or the accidental addition of foreign material is minimized.
Mix the material thoroughly by turning the entire sample over three times turning the entire sample into a conical pile.
Flatten the conical pile to a uniform thickness and diameter by pressing down the apex of the pile with the scoop, shovel, or trowel.
Obtain a test sample by selecting at least five increments of material at random locations from the miniature stockpile using the small scoop or spoon.
By following the sample dividing procedures as required by ASTM and AASHTO standards, an aggregate bulk sample reduced to a laboratory test sample will have minimal variations in the aggregate characteristics.
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