Replacing Lime with Rice Husk Ash to Reduce Carbon Footprint of Bituminous Mixtures

There have been several emphasized pathways toward a reduction in carbon footprint the built environment such as recycling, technologies with lower energy consumption, and alternative materials. Among materials, bio-based materials nature inspired solutions well-received. This study examines merits of using rice husk ash replacement for lime; lime has high mainly associated decomposition calcium carbonate to oxide form lime. Lime is commonly used bituminous composites roadway construction mitigate their susceptibility moisture damage. Replacing low-carbon could allow CO2 equivalent composites. paper studies (RHA) substitute conventional hydrated (HL) It should be noted that industries burn husks boiler fuel, generating substantial volume RHA. The disposal this major environmental impacts contamination air water. Here, we physical chemical characteristics both HL RHA use bitumen mixtures. was followed by examining extent dispersion each filler via optical microscopy ensure uniform dispersion. properties mixtures were further studied Marshall mix design method. found 25.67% increase stability 5.95% decrease optimum binder content achieved when replaced at 4% concentration. In addition, containing exhibited higher resistance cracking permanent deformation compared HL. Additionally, showed stripping similar mixture had enhanced economic results provide insights pertaining reduce pavements.