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.
