1.同济大学 先进土木工程材料教育部重点实验室，上海 201804;2.同济大学 材料科学与工程学院，上海 201804;3.山西佳维新材料股份有限公司，山西 运城 044200
卢子臣（1987—），男，河北涿州人，同济大学副教授，博士生导师，博士.E-mail：luzc@tongji.edu.cn
卢子臣（1987—），男，河北涿州人，同济大学副教授，博士生导师，博士.E-mail：luzc@tongji.edu.cn
TU528.31
国家自然科学基金资助项目（52208282）；运城市揭榜挂帅项目
1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education， Tongji University， Shanghai 201804，China;2.School of Materials Science and Engineering， Tongji University， Shanghai 201804，China;3.Shanxi Jiawei New Material Co.， Ltd.， Yuncheng 044200，China
利用凝结时间、抗压强度等测试，系统评价了水化硅酸钙（C-S-H）晶种与硫酸铝（AS）对硅酸盐-硫铝酸盐复合胶凝体系（PC-CSA）凝结硬化性能的影响，并通过水化进程、水化产物和微观结构分析探究其内在作用机理.结果表明：C-S-H晶种与AS均能显著缩短PC-CSA的凝结时间；复掺C-S-H晶种与AS显著促进了PC-CSA中硅相矿物的水化，提高了微观结构的致密性，提升了PC-CSA的抗压强度；当单掺AS时，PC-CSA中水化产物C-S-H的成核与长大过程均受抑制，而C-S-H晶种的加入通过提供成核位点，减缓了对水化产物C-S-H成核过程的抑制效果，促进了硅相矿物的反应，有助于解决喷射混凝土速凝与早强不协调的问题.
Through tests of setting time and compressive strength， the effect of calcium silicate hydrated（C-S-H） seed and aluminum sulfate （AS） on the setting and hardening performance of ordinary Portland cement-calcium sulfoaluminate cement （PC-CSA） was systematically investigated. Moreover， the mechanism was revealed with the combined techniques of hydration process， hydration product and microstructure analysis. The results show that both C-S-H seed and AS significantly shorten the setting time of PC-CSA. The combined addition of C-S-H seed and AS significantly promotes the silicate phase reaction of PC-CSA and densifies the microstructure to enhance the compressive strength of PC-CSA. When AS is doped alone， the nucleation and growth processes of hydration product C-S-H in PC-CSA are inhibited. However， the addition of C-S-H seeds mitigates the inhibition effect on the nucleation process of hydration product C-S-H by providing nucleation sites， thereby promoting the silicate phase reaction.Hence， these results address the imbalance between rapid setting and enhanced early strength of the shotcrete.
卢子臣,MOHAMMAD Mahadi Hasan,张立恒,贾亚运,孙振平.
