The ratio of the mass of a unit volume of a material to the mass of the same volume of gas-free distilled water at a stated temperature.
Calculated by the difference between the SSD mass and the oven-dry mass, divided by the oven-dry mass. Why You Need the Official PDF astm c128 pdf
The increase in the mass of aggregate due to water penetration into the pores of the particles. The ratio of the mass of a unit