# ASPHALT MIX DESIGN Effective Specific Gravity (Gse) of Aggregate

### Effective Specific Gravity (Gse) of Aggregate

Reference Asphalt Institute MS 2

Effective Specific Gravity is the ratio of the oven-dry mass of a unit volume of aggregate (including both the solid volume of the aggregate and the water permeable voids not filled with absorbed asphalt) to the mass of the same volume of water.

## Absorption

The increase in the mass of aggregate due to water in the pores of the material, but not including water adhering to the outside surface of the particles, expressed as a percentage of the dry mass. The aggregate is considered “dry” when it has been maintained at a temperature of 110 ± 5°C for sufficient time to remove all uncombined water by reaching a constant mass.

## Specific Gravity

The ratio of the mass (or weight in air) of a unit volume of a material to the mass of the same volume of gas-free distilled water at stated temperatures. Values are dimensionless.

## Apparent Specific Gravity

The ratio of the weight in air of a unit volume of the impermeable portion of aggregate at a stated temperature to the weight in air of an equal volume of gas-free distilled water at a stated temperature.

## Bulk Specific Gravity

The ratio of the weight in air of a unit volume of aggregate (including the permeable and impermeable voids in the particles, but not including the voids between particles) at a stated temperature to the weight in air of an equal volume of gas-free distilled water at a stated temperature.

## Bulk Specific Gravity (SSD)

The ratio of the mass in air of a unit volume of aggregate, including the mass of water within the voids filled to the extent achieved by submerging in water for 15–19 h (but not including the voids between particles) at a stated temperature, compared to the weight in air of an equal volume of gas-free distilled water at a stated temperature.

# Calculation:

Effective Specific Gravity (Gse) is calculated using the following equation.

$G s e = P s 100 G m m − P b G b$ where:
Gse = Effective Specific Gravity of aggregate
Ps = Percentage of aggregate by total mix weight
Pb = Percentage of binder by total mix weight at which Gmm test was performed
Gmm = Max. specific gravity of paving mixture
Gb = Specific gravity of binder

EFFECTIVE SPECIFIC GRAVITY OF AGGREGATE

Effective Specific Gravity : Output

Effective Specific Gravity of Aggregate:

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