Effect of Rice Husk Ash on the Properties and Performance of Geopolymer Concrete

ABSTRACT

This study examines the influence of Rice Husk Ash (RHA) as an additional substance in geopolymer concrete (GPC), specifically analyzing its impact on workability, setting times, compressive strength, and splitting tensile strength. The experimental findings demonstrate that an increase in RHA concentration results in a decrease in workability and a speeding up of setting times while yielding significant enhancements in both compressive and tensile strengths. More precisely, the compressive strength experiences an increase from 16 MPa to 35 MPa, while the splitting tensile strength rises from 1.3 MPa to 2.6 MPa as the amount of RHA increases. The changes are caused by the large surface area and water absorption qualities of RHA, which affect the consistency and curing characteristics of the mixture. Although there have been significant improvements in the mechanical qualities, the reduced workability and shorter setting periods pose issues that require more investigation. The study highlights the potential of RHA as an environmentally friendly addition, providing a sustainable option to traditional materials and aiding in reducing building waste. Suggestions for future research encompass enhancing the RHA composition to achieve a harmonious blend of mechanical performance and workability, examining the long-term durability and environmental resistance, establishing standardized production procedures, exploring other industrial by-products, and conducting thorough assessments of the life cycle and economic aspects. By focusing on these specific areas, the development of RHA-enhanced GPC will be promoted, facilitating its incorporation into sustainable building methods and improving its overall effectiveness and environmental footprint.