Investigation on Modified Hot Mix Asphalt Concrete with PET as Binder Additive and Fly Ash as Filler

Abstract

Suitability of modified Hot Mix Asphalt Concrete (HMA) with waste materials was investigated in this study. Marshall stability, Marshall flow and air void ratio were used as criteria to measure the suitability of modified HMA. The waste materials tested were coal fly ash, and PET. Fly ash was used to replace part of filler in HMA while PET was used to modify bitumen binder. Bitumen content was varied from 4% to 6% at 0.5% interval. PET was added in the percentage of 5%, 10% and 15%>. Stone dust, widely used conventional filler, was replaced by fly-ash at 20%), 30%> and 40%>. Results showed that PET used as additive increased the Marshall stability and reduces Marshall flow and air voids. Addition of fly ash increased the Marshall stability compared to unmodified HMA. It was concluded that, addition of fly ash and PET in the same sample increases the Marshall stability by 83.57% and reduces Marshall flow and air voids.