3- ASTM C29-Bulk Unit Weight and Voids in Aggregate

ASTM C29-Bulk Unit Weight and Voids in Aggregate.
To determine the bulk unit weight and voids in aggregate in either a compacted or loose condition.
Significance and Use
The bulk density of aggregate is needed for the proportioning of Portland cement concrete mixtures. The bulk density may also be used to determine the mass/volume relationships for conversions in purchase agreements. The percentage of voids between the aggregate particles can also be determined, on the basis of the obtained bulk density.
Apparatus
■ Measure. Use a rigid metal watertight container with a known volume. A minimum volume of the measure is required for different nominal maximum sizes of coarse aggregate. For a 25-mm (1 in.) nominal maximum aggregate size, a minimum volume measure of (9.3 liters) is required.
■ Balance, tamping rod, shovel or scoop, and a plate glass.