Study on Mix Proportion Optimization of Red Mud-Based Geopolymer Based on RSM Mingbin Shi, Kepeng Wang, Yanhua Cao, Huawen Li, Huibo Shen and Yan Chen E3S Web Conf., 625 (2025) 02010 Published online: 17 April 2025 DOI: 10.1051/e3sconf/202562502010