The influence of coal bottom ash as filler in asphalt mixture

Abstract

The number of transport or vehicles on the road increases, which causes the road pavement or asphalt surface to be exposed to greater loading. Problems such as permanent deformation, cracking, fatigue, and skidding happened because of this repeated loading. Many studies have been done to determine the suitable waste materials that can be used to improve resistance to rutting and fatigue cracking due to filler hardening and improve adhesion of filler to aggregate. The aim of this study is to investigate the effect of coal bottom ash on the engineering properties of the asphalt mixture. The different percentages of coal bottom ash (0%, 2%, 4% and 6%) were added to the asphalt mixture. The 60/70 penetration grade asphalt was used. The performance of the samples was evaluated through Marshall Stability, indirect tensile strength, resilient modulus, dynamic creep and image analysis. From the result obtained, there are significant effect comes from the addition of coal bottom ash. The result shows that the addition of coal bottom ash in the range of 2 to 4% produces the best outcomes for the density, stability, stiffness and flow while 6% for indirect tensile strength, dynamic creep and resilient modulus. Thus, it can be concluded that the existence of coal bottom ash can enhance the performance of the asphalt mix.