Resilient modulus of asphalt concrete mixtures.

摘要

This research investigates the properties of the two standard asphalt paving mixes used in Manitoba, Bituminous B (Bit B) and Bituminous C (Bit C).;The tensile strength and the elastic properties from static loading were determined using the indirect tensile strength test. A moisture sensitivity analysis was conducted on the paving mixtures to evaluate the long-term performance of the mixes.;The overall pavement strength and deflection response of the pavement layers for Bit B/B and the Bit B/C sections were determined using data from a Falling Weight Deflectometer (FWD). An elastic layer analysis was completed using the ELMOD computer program, and the backcalcuated resilient modulus was determined. The Inertia Method was then used to estimate the modulus of each asphalt layer.;Test results show that the Bit C mixes tested in the static mode show greater tensile strengths than the corresponding Bit B mixes. Through dynamic loading it was found that, Bit B mix generally has a greater resilient modulus value than the corresponding Bit C mix. The backcalculated resilient modulus values demonstrated similar trends to the resilient modulus calculated from dynamic loading. (Abstract shortened by UMI.)