Document Type

Report

Publication Date

Summer 5-20-2025

Abstract

Asphalt mixtures are traditionally produced using the Superpave mix design method, which emphasizes volumetric properties; however, current research is shifting toward performance-based and sustainable approaches. Within this context, the French High Modulus Asphalt Concrete (HMAC) design focuses on achieving specific performance criteria for workability, stiffness, rutting resistance, and fatigue behavior, employing a hard binder with higher asphalt content and fewer air voids than Superpave mixes. In this study, HMAC mixtures were developed using crumb rubber and locally sourced Louisiana materials. Five HMAC mixes using PG 76-22 and PG 67-22 binders with 10% and 20% crumb rubber were prepared, along with a Superpave control mix using PG 76-22 binder; all contained a fixed 20% RAP. Performance was evaluated through the Semi-Circular Bending (SCB) test for cracking resistance, Dynamic Modulus test for stiffness, and Flow Number test for permanent deformation. HMAC mixtures formulated with PG 76-22 binder and 20% crumb rubber met HMAC mix design and Louisiana DOT specifications, showing superior high-temperature stiffness, excellent rutting resistance, and satisfactory fatigue cracking performance compared to all other mixes tested.

Comments

Tran-SET Project 22BLSU02

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