Potential utilization of construction wastes in asphalt pavements as fillers using ranking framework

Abstract

This study explored the potential of four construction wastes namely brick dust (BD), concrete dust (CD), glass powder (GP), and limestone dust (LD) as fillers in asphalt concrete mixes using a decision-based ranking framework. The asphalt concrete mixes containing aforesaid fillers were designed and their optimum asphalt content and effective filler-binder ratios were assessed. The mastics corresponding to the estimated filler-binder ratio were prepared and their viscoelastic properties, as well as resistance against fatigue and rutting resistance, were analyzed. Asphalt concrete mixes containing waste fillers were also assessed against cracking, moisture permeation, and rutting. Additionally, the economic benefits and environmental viability of various wasted were also compared. The aptness of fillers was evaluated using a ranking methodology; in which suitable weightage is given to different test results, based on possible conditions on the field by the decision-makers. Asphalt mix containing fine fillers (LD, CD, and GP) exhibited superior resistance against rutting as well as cracking resistance. Asphalt mixes containing CD and LD displayed better moisture resistance due to the calcium-based minerals in them. Mixes containing LD and BD fillers were found to be more economical and environmentally friendly than conventional stone dust mixes. Based on the suggested ranking methodology, LD and GP emerged as the best and poor performing fillers respectively. © 2021 Elsevier Ltd