纳米C—S—H/PCE对硅酸盐硫铝酸盐复合水泥凝结硬化的影响  

Effect of nano-C—S—H/PCE on the setting and hardening process of Portland-Sulphoaluminate composite cement

作　　者：胡建伟 谢永江[1,2] 刘子科 郑新国[1,2] 曾志 王月华[1,2] 翁智财 蒋睿[1,2] HU Jianwei;XIE Yongjiang;LIU Zike;ZHENG Xinguo;ZENG Zhi;WANG Yuehua;WENG Zhicai;JIANG Rui(China Academy of Railway Science,Beijing 100081,P.R.China;State Key Laboratory for Track Technology of High-Speed Railway,Beijing 100081,P.R.China)

机构地区：[1]中国铁道科学研究院,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《土木与环境工程学报（中英文）》2021年第2期138-147,共10页Journal of Civil and Environmental Engineering

基　　金：十三五国家重点研发计划(2017YFB0310000);中国铁道科学研究院基金(2017YJ043、2018YJ049)。

摘　　要：研究了纳米C—S—H/PCE对硅酸盐硫铝酸盐复合水泥凝结时间、早期水化历程及抗压强度的影响,采用XRD、TG、pH计和SEM等分析测试手段对早龄期水化产物和液相碱度等进行表征,探讨了纳米C—S—H/PCE对硅酸盐硫铝酸盐复合水泥的增强机理。结果表明:掺加纳米C—S—H/PCE能有效缩短硅酸盐硫铝酸盐复合水泥浆体初凝及终凝时间,当C—S—H掺量≥1.0%时,硅酸盐硫铝酸盐复合水泥的初、终凝时间差明显缩短。纳米C—S—H/PCE加快了硅酸盐硫铝酸盐复合水泥水化放热速率,提高了总的水化放热量,早期水化产物生成数量多,但对水泥水化产物类型没有影响,硅酸盐硫铝酸盐复合水泥体系8、12、16 h的抗压强度显著提高。The effects of nano-C—S—H/PCE on the setting time,early hydration and compressive strength of Portland-Sulphoaluminate composite cement were studied.XRD,TG,pH meter and SEM were used to characterize the early hydration products and liquid alkalinity.The enhancement mechanism of nano-C—S—H/PCE on Portland-Sulphoaluminate composite cement was studied.The results showed that the addition of nano-C—S—H/PCE could effectively shorten both the initial setting time and final setting time of fresh composite cement paste.When the C—S—H content was more than 1.0%,the initial time difference of the composite cement was obviously shortened.The nano-C—S—H/PCE accelerated the hydration heat releasing rate of the composite cement,and increased the total hydration heat.The early-age hydration products were increased obviously,however,it had no effect on the type of cement hydration products.The compressive strength of the composite cement mortars at 8 h,12 h and 16 h were significantly increased.

关 键 词：硅酸盐水泥 硫铝酸盐水泥 水化硅酸钙凝胶 凝结硬化 水化反应 

分 类 号：TU528.04[建筑科学—建筑技术科学]