Performance Regulation of Desulfurized Gypsum on Solid Waste-Based Road Base Materials: Hydration Characteristics and Environmental Performance

作     者：Wu, Pengfei Wei, Chao Liu, Xiaoming Zhang, Zengqi Liu, Xinyue Ma, Shanliang Xue, Yu 

作者机构：State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing100083 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing100083 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Sustainable development 

摘      要：Industrial zones contribute to economic development but also produce substantial amounts of industrial solid waste, which poses significant disposal challenges. These wastes not only impede regional development but also harm the ecological environment. In response to these challenges, this study utilized solid waste from aluminum oxide plants, power plants, coal washing plants, and steel mills—specifically red mud, desulfurization gypsum (DG), fly ash, coal gangue, and blast furnace slag—to prepare solid waste-based road base materials (SWB). The paper reveals the regulatory patterns and mechanisms of DG on the mechanical performance, durability, and environmental properties of SWB. The results indicate that DG not only enhances the hydration exothermic rate and total heat release of SWB but also improves its heavy metal immobilization capacity. When the SO3 content is between 2.06-2.93%, the C/S (mass ratio of Ca to Si) falls within 0.72 to 0.75 and the S/A (mass ratio of Si to Al) ranges from 1.31 to 1.32, SWB exhibits a higher degree of polymerization, accompanied by a compressive strength of 7.1-9.1 MPa at 7 days and heavy metal comprehensive solidification rate exceeding 80%. SWB’s application provides a novel approach for the sustainable development of industrial zones. © 2024, The Authors. All rights reserved.