Effect of Buton Granular Asphalt (BGA) on compressive stress-strain behavior of asphalt emulsion mixture

Abstract

The natural rock asphalt which available in abundance in the southeast of Buton Island, Indonesia was attempted to use in production of cold mix asphalt. The purpose of this study is to replace of petroleum bitumen with local materials such as natural rock asphalt. Small granular size of natural rock asphalt that referred to Buton granular asphalt (BGA) was blended with petroleum bitumen as droplet phase in the asphalt emulsion mixture. Mixture with 5.5% of asphalt emulsion mixture made with cationic slow setting (CSS), that corresponded to the optimum asphalt emulsion content was used as a mixture control. At optimum asphalt emulsion content, bitumen of BGA was used for petroleum bitumen partial replacement in the asphalt emulsion mixture production. Test result revealed that utilizing BGA in asphalt emulsion mixture has proved for improving compressive strength where compressive strength of all mixture with BGA superpassed the compressive strength of mixture without BGA. Furthermore, mixture with BGA has less crack number as compared with the mixture without BGA.