Determination of AASHTO Layer Coefficients for Granular Materials by Use of Resilient Modulus
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Abstract
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.
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