Enhancing Sustainability Through the Partial Replacement of Recycled Aggregates and Rice Husk ASH

Abstract

Concrete, as one of the most widely used construction materials globally, poses both environmental and economic challenges due to its resource-intensive production and disposal. This study explores sustainable alternatives by investigating the incorporation of recycled aggregates (RA) and rice husk ash (RHA) as partial replacements for conventional aggregates and cement, respectively. Recycled aggregates, obtained from demolished structures, help reduce the depletion of natural resources and landfill waste. This study evaluates the mechanical properties, durability and workability of concrete mixes with varying proportions of recycled aggregates, providing insights into the optimal blend for achieving structural integrity. Rice husk ash, a waste product from rice milling, has pozzolanic properties that enhance the performance of concrete. By partially replacing cement with RHA, this research aims to reduce greenhouse gas emissions during cement production while improving the overall durability of concrete. The study assesses the compressive strength, water permeability, and resistance to chemical attacks of RHA- blended concrete mixes. The results demonstrate the economic benefits of utilizing these sustainable materials are discussed, emphasizing the need for a balanced approach that considers both environmental and economic factors.