Effectiveness of Micro Silica as Modifiers in Stone Mastic Asphalt Mixture

Pavements might deteriorate as a result of excessive traffic and weather conditions; hence pavements must be updated to provide enhanced performance and life span. Much study has been done to assess the appropriateness of various materials for pavement alteration. The goal of this study was to improve a Stone Mastic Asphalt Mixture by using an asphalt binder that has been modified with micro-silica particles. The following parameters were used: shear mixer, revaluation speeds (2000 rpm), and time for mixing (30 minutes). To investigate the mechanical characteristics of SMA based on Marshall stability and flow, indirect tensile strength, and Cantabria abrasion loss, three micro-silica concentrations of 2%, 4%, and 6% by weight of asphalt cement were applied. The results show that Micro Silica is an excellent modifier since it has achieved maximum stability, increased tensile strength, and decreased abrasion loss. Based on this research, the ideal is MS 6%.