纳米C-S-H的合成及其对普通硅酸盐水泥早期水化的影响  

Synthesis of nano C-S-H and its effect on early hydration of Portland cement

作　　者：赵双[1] 张丽敏 王新程 房延凤 ZHAO Shuang;ZHANG Limin;WANG Xincheng;FANG Yanfeng(Northeast University,Shenyang 110819,China;Shenyang Jianzhu University,Shenyang 110168,China;China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300457,China)

机构地区：[1]东北大学,辽宁沈阳110819 [2]沈阳建筑大学,辽宁沈阳110168 [3]中国建筑第六工程局有限公司,天津300457

出　　处：《混凝土》2024年第8期102-105,共4页Concrete

基　　金：国家自然科学基金(51808354);中国博士后科学基金(2018M641712);辽宁省教育厅2020年科研计划项目(1njc202017);辽宁省科技厅博士启动基金(2021-BS-165)。

摘　　要：为提高水泥基材料的早期强度,制备了纳米C-S-H悬浮液,并通过XRD和Zeta电位对其组成和粒度分布、稳定性进行了分析。通过水化放热、热重分析和扫描电子显微镜扫描电镜(SEM)研究了纳米C-S-H对硅酸盐水泥早期强度发展、水化放热、水化产物的影响。结果表明:合成了具有半结晶结构的稳定的纳米C-S-H悬浮液。纳米C-S-H的加入促进了C3S的水化,尤其是在前24 h,并使水泥的水化诱导期明显缩短。含有0.05%纳米C-S-H砂浆的8 h、16 h和24 h抗压强度分别提高了176.0%、145.6%和43.9%,与此同时,砂浆的3 d抗压强度没有明显减少。To improve the early strength of cement-based materials,nano C-S-H suspensions were prepared and characterized by XRD and Zeta potential.And the effects of nano C-S-H on the exothermic heat of early hydration,strength development and hydration products of Portland cement were studied by hydration exothermic,thermo gravimetry(TG)analysis and scanning electron microscope(SEM).The results showed that stable nano C-S-H with a semi-crystalline structure were prepared.The TG and SEM analysis indicated that the addition of nano C-S-H accelerate the hydration of C3S,especially in the first 24 h and the hydration induction period is significantly shortened.The 8 h,16 h and 24 h compressive strength of mortars containing nano C-S-H increased by 176.0%,145.6%and 43.9%,respectively,compared with the reference mortar.Meanwhile,there was no significant reduction in 3d compressive strength.

关 键 词：纳米C-S-H 水泥 水化 早强 微观形貌 

分 类 号：TU528.041[建筑科学—建筑技术科学]