Lab Services: Soil testing

Lab Services: Soil testing

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Test Method Title

Standard Method of Test for Determining the Resilient Modulus of Soils and Aggregate Materials

Reference Number

AASHTO T 307

Material

Soil

Test Property

Resilient modulus, permanent strain

Description of Test

This method covers procedures for preparing and testing untreated subgrade soils and untreated base/subbase materials for the determination of resilient modulus (Mr) under conditions representing a simulation of the physical conditions and stress states of materials beneath flexible pavements subjected to moving wheel loads .A repeated axial cyclic stress of fixed magnitude, load duration (0.1 s), and cycle duration (1.0 to 3.1) is applied to a cylindrical test specimen. During testing the specimen is subjected to a dynamic cyclic stress and a static-confining stress provided by means of a triaxial pressure chamber. The total resilient (recoverable) axial deformation response of the specimen is measured and used to calculate the resilient modulus.

Preferred Test Sample Size

2.87 in diameter x 5 ft Shelby tube or equivalent

Number of Test Specimens

1

Test Specimen Size

2.8 to 3.4 in diameter specimen with a length to diameter ratio of 2, depending on the maximum grain size.

Keywords

Resilient, modulus, base/subbase, subgrade, flexible testing, cyclic loads, permanent strain.

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