The layer coefficients a2 or a3 for an unbound granular base or subbase material are found from a relationship with resilient modulus, Eb. The resilient modulus for a given material can be found by test using the "theta model" or by use of an estimation regression equation. Eb is a function of several factors, as discussed below.
D. N. Richardson, "Determination of AASHTO Layer Coefficients for Granular Materials by Use of Resilient Modulus," Proceedings of the 37th Annual Asphalt Conference (1994, Rolla, MO), University of Missouri--Rolla, Jan 1994.
37th Annual UMR Asphalt Conference (1994: Nov. 9-10, Rolla, MO)
Civil, Architectural and Environmental Engineering
Article - Conference proceedings
© 1994 University of Missouri--Rolla, All rights reserved.