Bulk relative density (specific gravity) is the characteristic generally used for calculation of the volume occupied by the aggregate in various mixtures containing aggregate including Portland cement concrete, bituminous concrete, and other mixtures that are proportioned or analyzed on an absolute volume basis. Bulk relative density (specific gravity) is used in the computation of voids in aggregate in C 1252
Apparent relative density (specific gravity) pertains to the relative density of the solid material making up the constituent particles not including the pore space within the nbsp;nbsp;nbsp;particles that is accessible to water. This value is not widely used in construction nbsp;nbsp;nbsp;aggregate technology.
Water absorption values are used to calculate the change in the mass of an nbsp;nbsp;nbsp;aggregate due to water absorbed in the pore spaces within the constituent nbsp;nbsp;nbsp;particles, compared to the dry condition, when it is deemed that the aggregate nbsp;nbsp;nbsp;has been in contact with water long enough to satisfy most of the absorption nbsp;nbsp;nbsp;potential. The laboratory standard for absorption is that obtained after nbsp;nbsp;nbsp;submerging dry aggregate for approximately 24 hours in water. Aggregates nbsp;nbsp;nbsp;mined from below the water table may have a higher absorption when used, if not allowed to dry. Conversely, some aggregates when used may contain an nbsp;nbsp;nbsp;amount of absorbed moisture less than the 24 hours soaked condition: For an aggregate that has been in contact with water and that had free moisture on the nbsp;nbsp;nbsp;particle surface, the percentage of free moisture can be determined by deducting nbsp;nbsp;nbsp;the absorption from the total moisture content determined according to C 566
1.1 This test method covers the determination of the relative density (specific gravity) and absorption of fine aggregates.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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