Bulk Density and Voids in Aggregate Both ASTM C702 and D75 are both necessary to
ID: 1885484 • Letter: B
Question
Bulk Density and Voids in Aggregate
Both ASTM C702 and D75 are both necessary to obtain a representative sample of aggregate. Which of these ASTM is more relevant to work done in a materials laboratory?
Why would Method B, Quartering, be used instead of Method A, Mechanical Splitter, when using ASTM C 702?
What is the largest nominal maximum size of aggregate that can be testing in accordance with ASTM C29.
How accurate should the scale be for a bulk density test?
What is the diameter of the rod used in the bulk density test?
If the volume of the only ‘measure’ available for testing in accordance with ASTM C29 is approximately1/2-inches (or about 0.014 cubic meter), how many different types of aggregate, based on the listed nominal maximum sizes in ASTM C29, can be tested using this ‘measure’?
Discuss briefly the procedure to determine the volume of the measure?
The test size necessary for the bulk density test is given in Section 7.1 of ASTM C29, as 125 to 150% of the quantity required to fill the measure. Why is this size range ambiguous?
A laboratory technician uses a straightedge when leveling the aggregate surface when the measure is full, and ensures that no aggregate protrudes over the top of the measure. Is this an accurate measure of bulk density, yes or no?
What should the reported value be of a calculated bulk density of 93.463 lb/ft3, and a calculated voids in aggregate of 19.0%?
Explanation / Answer
ASTM C702 is more relevant to work done since it deals with the main reduction method.
Generally mechanical splitter is preferred but quartering is used instead of it in high moistened compacted aggregates.
In this test method of ASTM C29 ,the aggregate size should not exceed 125mm (5 in)
The unit of bulk density is gram/cm³.And the reading in scale is done in centimeters. So, the scale should be accurate enough to measure a cm.
Diameter of the rod used in bulk density test is 16 mm.
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