Production of geopolymer-based Sandcrete block using coal ash as partial replacement of OPC

Ogunjiofor, Emmanuel Ifeanyi and Uzuodu, Chibuike Lawrence and Ibe, Johnson Onyedika (2025) Production of geopolymer-based Sandcrete block using coal ash as partial replacement of OPC. World Journal of Advanced Engineering Technology and Sciences, 14 (2). pp. 301-316. ISSN 2582-8266

This study investigated the production of Sandcrete blocks in Nigeria, focusing on the potential of coal ash as a partial replacement for Ordinary Portland Cement (OPC). With Nigeria facing significant housing deficits due to rapid population growth and economic challenges, the construction sector has shown modest growth, necessitating innovative approaches to building materials. Sandcrete blocks, a primary construction material in Nigeria, are traditionally made using OPC, whose production contributes significantly to greenhouse gas emissions. This research aims to compare the strength characteristics and benefits of Sandcrete blocks produced with coal ash, highlighting its eco-friendly properties and lower CO₂ emissions. The study identifies various challenges within the block molding industry, including variability in raw materials, limited awareness of geopolymer-based alternatives, and the need for standardized production practices. Through laboratory experiments, including sieve analysis, dimension tests, and compressive strength assessments, the research seeks to establish optimal mix designs that enhance block quality while reducing costs. The findings underscore the importance of adopting sustainable materials in construction, contributing to environmental preservation and addressing the economic constraints faced by builders in Nigeria. Ultimately, this research provides insights into improving the Sandcrete block production process, promoting coal ash utilization, and enhancing the overall quality and affordability of construction materials in Nigeria.