Characterization of Recycled Concrete Aggregate Blended With Waste Tyre Rubber And Drywall Waste As Pavement Subbase Material

Abstract

As a developing nation, Pakistan faces financial obstacles in road construction, which is essential for economic growth but costly. A sustainable in order to resolve environmental issues involves using recycled materials in road construction. The construction industry has largely overlooked recycling despite the significant amount of debris generated during construction and demolition. Repurposing materials from building and demolition activities, such as rubber from tires and drywall waste, can serve as viable materials for subbase layers in roads. These recycled materials can improve road quality and performance while reducing risks to the natural environment and human health posed by stockpiling and disposal. This research evaluates the physical and mechanical properties of recycled concrete aggregates (RCAs) combined with drywall waste, waste tire crumb rubber, and quarry dust for flexible pavement subbases. The study investigated the effect of adding 0.5%, 1%, 1.5%, and 2% crumb rubber with 5%, 10%, 15%, and 20% Drywall waste as a percentage of fine aggregate with quarry dust in recycled concrete aggregates. By subjecting RCAs to a series of tests, their strength, durability, and stability are thoroughly assessed to determine the optimal ratios of crumb rubber and drywall waste. As a result of these evaluations, a notable improvement in compressive strength is observed. Cost analysis demonstrates the viability of using recycled materials in pavement subbase construction, offering a cost-effective, sustainable, and environmentally safe solution that reduces reliance on fresh materials.