Developing novel pothole patching mixtures utilizing iron ore waste as substitute to conventional aggregates with anti-stripping agent

Abstract

Development of potholes on roads and streets of prominent cities in India after the onset of monsoons is a common phenomenon. The remedy used for restoration of potholes is termed as “Patching” which prevents rapid pavement deterioration and provides smooth traffic flow. The present article aims at developing novel pothole patching mixtures utilizing Iron Ore Waste (IOW) as substitute to conventional aggregates (CA) with anti-stripping agent (ASA). Mix design, adhesion, cohesion, and moisture sensitivity of pothole patching mixtures were evaluated. Mix design properties were evaluated adopting the Marshall method, adhesion properties were evaluated as per Virginia Department of Transportation (DOT) test procedure, cohesion properties were evaluated as per AASHTO TP-44–94, and moisture sensitivity was evaluated using modified Lottman test. The strength of the initial and fully cured stages improved when IOW was substituted with conventional aggregates, and it was higher than 5.1 kN. As for Cohesion, every substance under investigation retained more than 60% of its original composition at the initial test conditions (4 °C and five blows). When tested at 25 °C and five blows, cohesiveness exhibited the same pattern as when tested at 4 °C. The findings of the adhesive test showed that IOW-Z has a maximum adhesion time of 35 s. Moreover, IOW-based pothole patching mixtures outperformed CA-based pothole patching mixtures in terms of resistance to moisture sensitivity. Results also indicate addition of ASA improved adhesion, cohesion, and moisture sensitivity properties of pothole patching mixtures regardless of aggregate type.