C-S-H晶种与硫酸铝作用下PC-CSA的凝结硬化性能  

Setting and Hardening Performance of PC-CSA under C-S-H Seed and Aluminum Sulfate

作　　者：卢子臣 MOHAMMAD Mahadi Hasan 张立恒 贾亚运 孙振平[1,2] LU Zichen;MOHAMMAD Mahadi Hasan;ZHANG Liheng;JIA Yayun;SUN Zhenping(Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education,Tongji University,Shanghai 201804,China;School of Materials Science and Engineering,Tongji University,Shanghai 201804,China;Shanxi Jiawei New Material Co.,Ltd.,Yuncheng 044200,China)

机构地区：[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

出　　处：《建筑材料学报》2025年第2期95-102,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(52208282);运城市揭榜挂帅项目。

摘　　要：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.

关 键 词：喷射混凝土 C-S-H晶种 硫酸铝 硫铝酸盐水泥 水化特性 孔结构 

分 类 号：TU528.31[建筑科学—建筑技术科学]