Research status of building materials utilization and CO2 curing technology on typical coal-based solid waste: A critical review

Abstract

Coal, one of China's most abundant natural resources, plays a crucial role in providing substantial energy and promoting economic growth. However, the disposal and storage of large quantities of coal-based solid waste (CBSW), such as coal gangue (CG), fly ash (FA), and coal gasification slag (CGS), generated during coal production and utilization processes, pose serious social and environmental challenges. The application of solid waste in the construction materials field has garnered significant attention and is anticipated to become a primary treatment method in the future. This paper comprehensively reviews the characteristics, pretreatment methods, and utilization performance of typical CBSWs, aiming to offer a basis and valuable reference for optimizing the inherent properties of solid waste and its utilization. Additionally, it discusses the influence of various carbonation curing parameters on CO2 capture and elucidates the impact mechanism of carbonation curing on the performance of CBSW concrete. This study holds great significance for the utilization of CBSW in building materials and carbon reduction, particularly in regions with substantial solid waste and high CO2 emissions.

Keywords

• Coal-based solid waste
• Building materials
• CO2 curing technology