Permanent deformation and moisture induced damage potential of Stone Matrix Asphalt (SMA) containing Barite powder

Articles in Press

Document Type : Research Paper

Authors

1 Civil Engineering departement, yazd university

2 Yazd university

3 Department of Civil and Environmental Engineering Geotechnics, Roads and Transportation Specialty

Abstract

The aggregate particles in asphalt mixtures get connected to each other by (bitumen - mineral filler) mastics. The goal of this paper is to study the feasibility of partial or total substitution of limestone (LS) filler by barite powder (BP) in Stone matrix asphalt (SMA) mixtures. To evaluate barite powder (BP) performance, resilient modulus, indirect tensile strength, freeze-thaw cycles, dynamic creep in two different temperatures, and bitumen drain-down tests were used. The obtained values revealed improvement in the moisture performance of Stone matrix asphalt mixtures by the increase in barite powder content while it showed to have the reverse effect on asphalts' permanent deformation in higher temperatures compared to the samples containing limestone filler. The results show that the TSR values of SMA-LS/BP and SMA-BP in the first freeze-thaw cycle do not show any significant shift compared with the SMA-LS mixture. Their TSR values increased 7.83% and 11.62%, respectively, after experiencing 3 cycles of F-W and simultaneously meet the specification minimum requirement of 80%. After 5 cycles of F-W, SMA mixtures containing 50% and 100% of barite powder show more improvement and the TSR values increase by 9.69% and 14.15%.

Keywords

International Journal of Transportation Engineering

Articles in Press, Accepted Manuscript
Available Online from 30 December 2023

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