减缩剂对碱激发煤矸石-矿渣胶凝材料性能的影响  

Effect of Shrinkage Reducing Agent on Properties of Alkali-Activated Coal Gangue-Slag Cementitious Material

作　　者：张文艳[1] 林华夏 王帅 薛孟芬 冉俊生 朱建平[1] ZHANG Wenyan;LIN Huaxia;WANG Shuai;XUE Mengfen;RAN Junsheng;ZHU Jianping(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Henan Institute of Architectural Sciences Co.,Ltd.,Zhengzhou 450053,China)

机构地区：[1]河南理工大学材料科学与工程学院,焦作454000 [2]河南省建筑科学研究院有限公司,郑州450053

出　　处：《硅酸盐通报》2022年第2期526-535,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51908198);中国博士后科学基金第63批面上基金(2018M632774);河南省博士后面上项目(001802025);河南省住房城乡建设科技计划(HNJS-2020-K26)。

摘　　要：本文探讨了减缩剂(SRA)对碱激发煤矸石-矿渣(AACGS)胶凝材料力学性能和干燥收缩的影响,进一步分析掺入SRA后水化热、水化产物及微观结构的变化规律。结果表明:掺入3%(质量分数)SRA明显降低了AACGS胶凝材料的力学性能,但随着水化的进行,降低幅度逐渐减小;随着SRA掺量的增加,干燥收缩显著减小。微观分析表明,SRA的掺入没有导致新的水化产物生成,但延缓了水化反应,抑制了碱激发材料早期的聚合反应,增加了碱激发胶凝材料的孔隙率,这也是SRA使AACGS胶凝材料力学性能降低的原因。SRA并没有明显改变孔隙溶液中碱金属离子的浓度,水化进程的延缓和固相结构的形成是其降低AACGS砂浆干燥收缩的主要原因。In this paper, the effect of shrinkage reducing agent(SRA) on the mechanical property and drying shrinkage of alkali-activated coal gangue-slag(AACGS) cementitious materials was investigated. And the variation of hydration heat, hydration products and microstructure with incorporating SRA was further discussed. The results show that incorporation of 3%(mass fraction) SRA significantly reduces the mechanical property of AACGS cementitious materials, but the reduction amplitude gradually decreases with the progress of hydration. The drying shrinkage decreases significantly with the increase of SRA content. Microscopic analysis shows that the addition of SRA does not lead to the formation of new hydration products, but delayes the hydration reaction, inhibites the early polymerization of alkali-activated materials and increases the porosity of alkali-activated cementious materials, which causes the decrease of mechanical property of AACGS cementious materials with SRA. In addition, SRA does not significantly change the concentration of alkali metal ions in pore solution. The delay of hydration process and the formation of solid phase structure caused by the addition of SRA are the main reasons for reducing the drying shrinkage of AACGS mortar.

关 键 词：碱激发胶凝材料 矿渣 煤矸石 力学性能 干燥收缩 孔隙溶液 微观结构 

分 类 号：TU528.1[建筑科学—建筑技术科学]