铜尾矿改性水泥基地聚合物注浆材料性能与机理分析
Performance and mechanism analysis of copper tailings modified cement-based geopolymer grouting materials
摘要
Abstract
Copper tailings were chosen to prepare copper tailings modified cement-based geopolymer grouting materials in order to promote the green growth of geotechnical engineering and enhance the efficiency of resource exploitation of tailings.The effects of water-to-solid ratio,copper tailings doping,alkali activator doping and alkali activator modulus on the performance indicators and microscopic mechanisms of the modified slurry were investigated.The results show that adding tailings can improve the compressive strength of the modified slurry stone,and that adding alkali activator can improve the overall reaction degree of the slurry as well as reduce the water separation rate of the slurry.Taking into account the performance indicators,the optimal ratio of the modified slurry is selected as water-to-solid ratio 1.0,copper tailings doping 30%(mass fraction),alkali activator doping 4%,and alkali activator modulus 1.6.Compared with pure cement slurry,the optimum proportion viscosity of the modified slurry is reduced by 11.1%,the fluidity of the modified slurry is increased by 22.3%,the water separation rate of the modified slurry is reduced by 29.7%,and the 28 d compressive strength of the modified slurry stone is only reduced by 9.5%.The geopolymer reactions in the modified slurry result in the formation of three-dimensional network structures such as C-A-S-H gel and N-A-S-H gel,which have excellent performance.The findings of this study can provide high-performance and low-cost grouting materials for geotechnical engineering,as well as reference for resource exploitation of tailings and other solid waste materials.关键词
岩土工程/注浆材料/铜尾矿/地聚合物/碱激发/微观机理Key words
geotechnical engineering/grouting materials/copper tailings/geopolymer/alkali activation/microscopic mechanisms分类
交通工程引用本文复制引用
付宏渊,姚杰,邱祥..铜尾矿改性水泥基地聚合物注浆材料性能与机理分析[J].中南大学学报（自然科学版）,2024,55(3):1107-1119,13.基金项目
国家自然科学基金资助项目(52278439,51838001,52078066) （52278439,51838001,52078066）
湖南省科技创新计划项目(2023RC3138) （2023RC3138）
湖南省自然科学基金面上资助项目(2023JJ30035) （2023JJ30035）
湖南省教育厅自然科学青年项目(21B0317) （21B0317）
长沙理工大学专业学位研究生"实践创新与创业能力提升计划"项目(CLSJCX22004)(Projects(52278439,51838001,52078066)supported by the National Natural Science Foundation of China （CLSJCX22004）
Project(2023RC3138)supported by the Science and Technology Innovation Program of Hunan Province （2023RC3138）
Project(2023JJ30035)supported by the General Program Natural Science Foundation of Hunan Province （2023JJ30035）
Project(21B0317)supported by the Natural Science Youth Project of Hunan Provincial Education Department （21B0317）
Project(CLSJCX22004)supported by the Changsha University of Science and Technology Professional Degree Graduate Student"Practical Innovation and Entrepreneurship Enhancement Program") （CLSJCX22004）
