Influence of rice husk ash and recycled glass powder on physical-mechanical properties of concrete in rigid pavement

Abstract

The search for sustainable alternatives in civil construction has driven the use of agricultural and industrial byproducts to optimize concrete performance and reduce its environmental impact. This research evaluates the reduction in cement and fine aggregate usage through the inclusion of alternative materials such as rice husk ash (RHA) and recycled glass powder (GGP), respectively, analyzing their effect on the physical and mechanical parameters of 27.46 MPa rigid pavement concrete. Ten mix designs were prepared with proportions of 0%, 5%, 10%, and 20% RHA and 0%, 10%, 15%, and 20% GGP, under controlled curing and testing conditions for 28 days. The results show that the incorporation of CCA increased compressive and flexural strength by up to 15%, thanks to its high silica content, which promotes the formation of hydrated calcium silicate gels. Meanwhile, PVR improved density and reduced porosity by acting as a micro-filler, strengthening the concrete matrix. This combination resulted in a more compact structure with better particle packing and greater durability under load and surface wear. The best-performing mixture was the one with 5% CCA and 20% PVR, achieving the optimal balance between strength, compactness, and sustainability, making it an efficient and environmentally friendly alternative for rigid pavement construction