Lab Services: Aggregate testing

Lab Services: Aggregate testing

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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.

Preferred Test Sample Size

25 kg (one full 5-gallon pail)

Number of Test Specimens

1

Test Specimen Size

Typically 5 kg but determined from aggregate size

Keywords

Density, Relative Density, Specific Gravity, Absorption

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