Backcalculation of Unbound Grandular Layer Moduli

Project Details
STATE

MI

SOURCE

RM

END DATE

12/12/18

SPONSORS

Michigan DOT

Project description

To minimize the impact of freeze-thaw cycles on pavement performance, granular subbase (typically sand) and base (typically gravel) layers are conventionally used to provide protection to the roadbed soils from the detrimental effects of freezing and to minimize the stresses delivered to the roadbed soils. In this study, the value of the resilient modulus of commonly used granular materials were backcalculated using two- and three-layer systems and Nondestructive Deflection Test (NDT) data obtained by MDOT. The backcalculated resilient modulus values of the unbound granular layers were subjected to various tests to determine the most appropriate values to be used in the pavement design process.
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