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Abstract

 Stone Matrix Asphalt (SMA) is a gap graded mix, characterized by high coarse aggregates, high asphalt contents and polymer or fiber additives as stabilizers. Highconcentration of coarse aggregate maximizes stone-to-contact and interlocking in the mix whichprovides strength, and the rich mortar binder provides durability. The stabilizing additives composed of cellulose fibers, mineral fibers or polymers are added to SMA mixtures to preventdraindown from the mix. In comparison to dense graded mixtures SMA has a higher proportion ofcoarse aggregate, lower proportion of middle size aggregate and higher proportion of mineral filler. It resists permanent deformation and has the potential for long term performance and durability.

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