Performance of Pervious Concrete with Rice Husk Ash and Perlite Stone

Abstract

Pervious concrete is an environmentally sustainable material known for its ability to allow water to pass through, thereby reducing surface runoff and aiding groundwater recharge. However, its high porosity often results in lower compressive strength compared to conventional concrete. This study aims to enhance the performance of pervious concrete by partially replacing cement with Rice Husk Ash (RHA)and coarse aggregates with Perlite stone. RHA, an agro-industrial by- product with pozzolanic properties, and Perlite, a lightweight, porous volcanic material, were chosen for their environmental and structural benefits. The mix design followed a 1:4.5 cement- to-aggregate ratio with a constant water-cement ratio of 0.45. RHA was used in varying proportions (4%, 6%, 8%,10%) while Perlite stone was replaced as 10% by weight of the aggregate in all mixes. The concrete specimens were tested for compressive strength and permeability after a 28-day curing period. Results showed that permeability increased with 6 % RHA content and 10% Perlite, whereas compressive strength reduced as RHA content increased. The optimal balance was found at 6% RHA and 10% Perlite offering adequate strength and permeability. This study demonstrates that incorporating RHA and Perlite in pervious concrete enhances sustainability while maintaining functional performance, making it suitable for eco- friendly pavements and drainage systems.