溶脱处理对矿渣基胶凝材料性能的提升机理  

Enhancement Mechanism of Performance of Slag-Based Cementitious Materials By Infiltrated Process

作　　者：谢辰 陈伟[1] 王辉[3] 王栋民[4] 刘一辉 李博[2] XIE Chen;CHEN Wei;WANG Hui;WANG Dongmin;LIU Yihui;LI Bo(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;China Construction Third Engineering Bureau Group Co.Ltd.,Wuhan 430070,China;School of Chemical and Environmental Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]中国建筑第三工程局有限公司,武汉430070 [4]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《硅酸盐通报》2025年第4期1297-1305,共9页Bulletin of the Chinese Ceramic Society

基　　金：青年科学基金(52102031)。

摘　　要：具有火山灰特性的高炉矿渣,磨细后可被用于生产矿渣基胶凝材料。与传统水泥相比,矿渣基胶凝材料水化活性较低,为提升矿渣基胶凝材料中磨细高炉矿渣(GGBS)的水化活性,本文创新地提出使用聚合硫酸铝溶液溶脱处理GGBS的方法,加速GGBS玻璃网络结构解聚,以提升矿渣基胶凝材料性能。试验对比了溶脱处理GGBS与溶液搅拌GGBS的离子溶出行为、表面元素组成及微观结构形貌,并通过抗压强度、水化放热、物相变化及微观形貌测试研究了溶脱处理提升矿渣基胶凝材料性能的微观机理。结果表明,溶脱滤液的硅离子溶出量较溶液搅拌滤液的硅离子溶出量明显提升,溶脱GGBS表面的n(Ca)∶(n(Si)+n(Al))降至0.266,溶脱GGBS结构发生溶蚀。使用溶脱GGBS制备的矿渣基胶凝材料凝结时间缩短至147 min,硬化体1 d抗压强度提升至3.75 MPa。溶脱处理GGBS可促进钙矾石与水化硅铝酸钙(C-A-S-H)凝胶的生成,加快矿渣基胶凝材料水化进程,提升矿渣基胶凝材料性能。Granulated blast furnace slag with volcanic ash charateristics can be used to produce slag-based cementitious materials after grinding.Compared with traditional cement,the hydration activity of slag-based cementitious materials is low.In order to enhance the hydration activity of grind granulated blast furnace slag(GGBS)in slag-based cementitious materials,this paper innovatively proposed to use polymerized aluminum sulfate solution to infiltrate and treat GGBS,accelerated the depolymerization of GGBS glass network structure,and improved the performance of slag-based cementitious materials.The ion dissolution behavior,surface elemental composition and microstructure morphology of GGBS-infiltrate were compared to GGBS-mix.The mechanism of infiltrated process to enhance the performance of slag-based cementitious materials was also analyzed by compressive strength,exothermic hydration,phase changes,and microscopic morphology tests.The results show that the amount of silicon ions dissolved in infiltrated filtrate is significantly higher than the amount of silicon ions dissolved in the mixed filtrate,the molar ratio of n(Ca)∶((n(Si)+n(Al))on the surface of the GGBS-infiltrate is reduced to 0.266,and the structure of GGBS-infiltrate is corroded.The setting time of the slag-based cementitious material prepared using infiltrated GGBS is reduced to 147 min,and the compressive strength of samples reaches to 3.75 MPa at 1 d.The GGBS-infiltrated process can promote the generation of ettringite and C-A-S-H gel,accelerate the hydration process of slag-based cementitious materials,and improve the performance of slag-based cementitious materials.

关 键 词：聚合硫酸铝 溶脱 磨细高炉矿渣 矿渣基胶凝材料 物相分析 

分 类 号：TU526[建筑科学—建筑技术科学]