Influence of Glass Powder and Quartzite Rock Dust as Fillers in Stone Mastic Asphalt

Abstract

Stone Matrix Asphalt (SMA) is a gap graded aggregate mix consisting of 80% coarse aggregates by weight and 8-12% of filler by weight. As SMA contains large amount of filler compared to HMA, the type of filler used influences the properties of the mix significantly. The present work discusses the effective use of two fillers namely quartzite rock dust and glass Powder. Quartzite rock dust and glass powder are partially replaced in the range of 3% to 9% by the total weight of stone dust filler. From the results it was found that partial replacement of the stone dust filler by quartzite rock dust significantly improved the properties of SMA mix. It was also found that 5% and 7% were the optimum percentage replacement of quartzite rock dust and glass powder from the stability point of view. Keywords-Filler, quartzite rock dust, optimum bitumen content, glass powder, stability.