Laboratory performance evaluation SMA, CMHB and dense graded asphalt mixtures

Document Type

Article

Publication Date

12-1-1999

Abstract

The laboratory performance of three asphaltic concrete mixtures (stone matrix asphalt (SMA), Coarse Matrix High Binder (CMHB), and conventional type 8 WC mixture (as the control mix)) was investigated at the Louisiana Transportation Research Center. Basic engineering tests (indirect tensile strength and strain, resilient modulus, creep compliance, and fatigue life) were performed, including axial creep, indirect tensile creep, indirect tensile resilient modulus tests, Superpave frequency sweep and repetitive shear at constant height, repetitive shear at constant stress ratio test, and Hamburg Wheel Tracking test. Performance indices from various tests did not indicate uniform agreement, but a comprehensive comparison suggested that dense-graded mixture with limestone aggregates and polymer modified asphalt binder (D_PL) and CMHB had higher rutting performance indices than the SMA mixtures. Among SMA Mixtures having different saphalt binders, the mixture with PAC-40HG had relatively better rut-resistant behavior performance indices while the one with MG20-40 and AC-30 added with fibers had the lowest draindown. In SMA mixtures with various aggregate types, the mixture containing sandstone had the best rut-resistant indices while the one with novaculite had better indicies than the one with limestone.

Publication Source (Journal or Book title)

Proceedings of the Association of Asphalt Paving Technologists

First Page

252

Last Page

283

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