For aggregate, density is a significant parameter. Density is measured for aggregates by averaging the relative density (specific gravity) of fluid with the water density.
Bulk Density of Aggregate
The aggregate’s bulk density or unit weight is the mass or weight of the aggregate that allowed a given unit volume container to be filled.
Bulk Density = (Mass/volume)
Features:
- So, if the volume is unit, Bulk Density= Mass.
- Kg / m3 or lb / ft3 device.
- The volume in this description is that it includes the aggregates as well as the voids between the particles of aggregates.
- The estimated aggregate bulk density widely used in concrete of normal weight varies from 1200-1750 kg / m3 (75-110 lb / ft3).
- Here, ASTM C 29 offers the standard test method for determining the bulk density of aggregates.
Relative Density of Aggregate
An aggregate’s relative density (specific gravity) is the ratio of its mass to the mass of the same water volume.
Relative Density = (Mass of the Aggregate/Mass of equal volume of water)
Features:
- Most aggregates have a relative density of 2400-2900 kg / m3 (150-181 lb / ft3) between 2.4-2.9 and the equivalent particle (mass) density.
- The standard test method for coarse aggregates was clarified in ASTM C 127 and the standard test method was described in ASTM C 128 for fine aggregates.
- It is possible to determine the relative density of the mixture on an oven-dry basis or on a saturated surface-dry basis.