Test Method Title
Specific Gravity and Absorption of Coarse Aggregate
Reference Number
AASHTO T 85
Material
Aggregate
Test Property
Specific Gravity
Description of Test
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.
Number of Test Specimens
1
Test Specimen Size
Typically 5 kg but determined from aggregate size
Keywords
Absorption, Density, Relative Density, Specific Gravity