硅质外加剂与络合剂协同作用对砂浆微观结构和自修复性能的影响  

Investigation on synergistic effect of siliceous admixtures andchelator on microstructure and self-healing properties of mortar

作　　者：付世祥 杨胜文 庄荣华 周紫晨[3] 余剑英[1] FU Shixiang;YANG Shengwen;ZHUANG Ronghua;ZHOU Zichen;YU Jianying(College of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;China First Metallurgical Group Co.,Ltd.,Wuhan 430080,China;Wuhan Metallurgical Construction Research Institute Co.,Ltd.,of MCC Group,Wuhan 430080,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]中国一冶集团有限公司,武汉430080 [3]中冶武汉冶金建筑研究院有限公司,武汉430080

出　　处：《功能材料》2025年第4期4016-4023,共8页Journal of Functional Materials

基　　金：国家重点研发计划项目(2022YFC3801600)。

摘　　要：为提高水泥砂浆的防水性能,研究了不同种类硅质外加剂(硅灰、沸石、硅藻土)与络合剂协同使用对砂浆微观结构、力学性能、抗渗性能和自修复性能的影响。结果表明,与单掺络合剂砂浆相比,复掺硅质外加剂与络合剂的砂浆中形成了更多的水化硅酸钙和碳酸钙产物,孔径>0.1μm的孔隙显著减少,砂浆的抗压强度、抗渗性能和裂缝自修复能力均明显提高。在3种硅质外加剂中,硅灰与络合剂协同使用对砂浆的孔结构以及抗压、抗渗和自修复性能的改善效果最好。相比单掺0.5%络合剂砂浆,复掺4%硅灰和0.5%络合剂砂浆在养护28 d后总孔隙率降低了17.2%、抗压强度提高了27.0%、氯离子扩散系数降低了23.3%。自修复性能测试表明,当预制裂缝砂浆的初始渗水率均为250 mL/min时,单掺络合剂和复掺硅灰与络合剂砂浆养护28 d后的相对渗水系数分别降低至31.8%和11.6%,对于宽度为0.30 mm的裂缝,单掺络合剂砂浆养护至28 d时完全修复,而复掺硅灰与络合剂砂浆养护至7 d时即可完全修复。In order to improve the waterproof performance of cement mortar,synergistic effect of different kinds of siliceous admixtures(silica fume,zeolite,and diatomite)and chelator on the microstructure,mechanical properties,impermeability and self-healing properties of cement mortar were investigated.The results showed that compared to mortar with chelator,more products such as C-S-H and CaCO 3 were produced in the mortar with siliceous admixture and chelator,and the pores with size larger than 0.1μm were significantly reduced.Meanwhile,the compressive strength,impermeability and self-healing properties of mortar with siliceous admixture and chelator were significantly improved.Among three kinds of siliceous admixtures,synergistic use of silica fume and chelator exhibited the best improvement effect on the pore structure,compressive strength,impermeability and self-healing properties of mortar.After standard curing for 28 d,compared to mortar with 0.5%chelator alone,the total porosity and chloride diffusion coefficient of mortar with 0.5%chelator and 4%silica fume were decreased by 17.2%and 23.3%,respectively,and the compressive strength of that was enhanced by 27.0%.Self-healing performance tests showed that when the initial water seepage rate of prefabricated cracked mortar was 250 mL/min,the relative water seepage coefficients of mortar with chelator and mortar with chelator and silica fume after curing for 28 d were 31.8%and 11.6%,respectively.Cracks with a width of 0.30 mm in mortar doped with chelator alone could be repaired at 28 d of curing,while cracks with same width in mortar with silica fume and chelator could be completely repaired at 7 d of curing.

关 键 词：防水砂浆 硅质外加剂 络合剂 微观结构 自修复 抗渗性能 

分 类 号：TU528[建筑科学—建筑技术科学]