Research Status and Development Trend of Mechanical Properties of Red Mud Geopolymer Concrete
WANG Yongbao1, YUAN Yuan2, ZHAO Renda2, ZHANG Jinjie1
1 College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract: Red mud(RM) is a kind of alkaline waste produced in the process of extracting alumina. Because of its high alkali content and great harm to environment, it has low utilization rate. One effective way to use RM is the development of red mud geopolymer concrete (RMGC). As a new type of green building material, RMGC has many advantages, such as acceptable early strength, durability performance and comprehensive utilization of industrial waste residue. Therefore, the research on RMGC has attract the most attention among researchers. However, compared with slag and fly ash, RM has low pozzolanic reactivity. The high RM content often leads to low concrete strength. Therefore, the rate of RM utilization is low in RMGC. The strength formation mechanism and mineral composition of RMGC are different from those of ordinary concrete. And there are many factors affecting the basic mechanical properties of RMGC. The effects of different factors on basic mechanical properties of RMGC has not been unified. A reasonable design method of RMGC mix ratio has not been put forwarded. All these restrict the widely application of RMGC. In recent years, researchers have carried out experiments and theory study on basic mechanical properties of RMGC.The design method of mix proportion based on molar ratio and mass ratio was discussed. And the effects of different factors on the basic mechanical properties of RMGC has been obtained. The strength formation mechanism of RMGC is discussed. All these laid a solid foundation for development and application of RMGC. The research status of mechanical properties of RMGC at home and abroad are reviewed in this paper. And the types and mix design methods of RMGC are summarized. And the factors such as the type and content of alkali activator, RM content, sodium silicate modulus, curing type, curing temperature, RM source, RM processing methods, additives and other factors affecting mechanical properties of RMGC are also mentioned. Finally, the problems faced by researchers on mechanical properties of RMGC and the future research are investigated.
王永宝, 原元, 赵人达, 张晋杰. 赤泥地聚物混凝土力学性能研究现状及发展趋势[J]. 材料导报, 2020, 34(15): 15102-15109.
WANG Yongbao, YUAN Yuan, ZHAO Renda, ZHANG Jinjie. Research Status and Development Trend of Mechanical Properties of Red Mud Geopolymer Concrete. Materials Reports, 2020, 34(15): 15102-15109.
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