Exploring the Synergistic Effects of Industrial and Agricultural Waste in Concrete

Abstract

Concrete is widely used in the construction industry due to its cost-effectiveness and superior properties compared to other materials. However, the increasing consumption of Ordinary Portland Cement (OPC) due to infrastructure growth and residential construction has raised environmental concerns. Cement production contributes approximately 7% of global carbon dioxide emissions, exacerbating climate change. Additionally, the large-scale mining of finite natural resources like limestone and river sand for fine aggregate has led to environmental degradation, prompting governments, particularly in developing nations, to regulate sand mining. These challenges highlight the urgent need for sustainable alternatives in concrete production. Research has explored supplementary cementitious materials such as fly ash, slag, silica fume, rice husk ash, and metakaolin, demonstrating enhanced strength, reduced permeability, and improved hydration properties in blended cement concrete. However, many locally available pozzolanic materials remain underutilized due to limited characterization and assessment. Aggregates, which constitute the majority of concrete volume, are extensively extracted, leading to severe environmental impacts. With sand and gravel being the most extracted resources globally, their depletion surpasses even biomass and fossil fuel extraction. In response, researchers and organizations are focusing on sustainable alternatives for concrete production by recycling industrial waste and by-products.