A sample of aggregate is immersed in water for 15-19 hours to essentially fill the pores. It is then removed from the water, the water dried from the surface of the particles, and weighed. Subsequently the sample is weighed while submerged in water. Finally the sample is oven-dried and weighed a third time. Using the mass and weight measurements thus obtained and formulas in the method, it is possible to calculate three types of specific gravity and absorption.
Typically 5 kg but determined from aggregate size
Density, Relative Density, Specific Gravity, Absorption