Use of Waste Plastic, Waste Rubber and Fly Ash in Bituminous Mixes

Abstract

Objectives: To explore the use of waste plastic, waste rubber and fly ash as a road construction material. The reduction of bitumen content in the mix by addition of waste plastic and waste rubber is the can help Te focus area which make the mix more economical. Methods: The problem of rising costs of road construction materials, combined with the environmental concerns on industrial waste management is driving new research to find a single solution, based on a synergy between the two issues. In this experimental study, waste plastic, waste rubber and fly ash has been used in bituminous mixes and their optimum content percentages are determined. Powder form of waste plastic and waste rubber amount has been used, and the quantity of bitumen has been reduced by that much amount. Standard Marshal Mix design process has been followed. Samples were prepared using various (equal) percentages of waste plastic and waste rubber content (from 4% to 8% by weight of bitumen); with various percentage of bitumen content in mix (from 4% to 8% by weight of total mix). Stone dust (normally 2% by weight of total mix) which is used as a filler, is also replaced (by upto 50%) by fly ash. Finding: The statistical analyses like correlation and regression have been done to find the relationship between variables especially the affecting of independent parameters to depended parameters. (Waste plastic was affected to the stability, bitumen was affected to flow value). Application/Improvements: The results show that a mix of 5% each of waste plastic and waste rubber (by weight of bitumen) and 4.5% of bitumen in the total mix was found as an optimum percentage by weight of total mix, with 1% fly ash as a filler material to control the flow value. Keywords: Aggregates, Bitumen, Fly Ash, Marshal Stability Test and Marshall Properties, Waste Plastic, Waste Rubber