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水化硅酸钙(C-S-H)结构形成机理的实验研究及模拟计算

发表时间:2013-07-31  浏览量:1052  下载量:279
全部作者: 何真,王磊,蔡新华
作者单位: 武汉大学水资源与水电工程科学国家重点实验室;长江科学院材料与结构研究所
摘 要: 采用傅里叶变换红外(Fourier transform infrared,FTIR)、29Si固体魔角旋转(magic-angle spinning,MAS)、核磁共振(nuclear magnetic resonance,NMR)等技术,并综合几种主要的水化硅酸钙(calcium silicate hydrate,C-S-H)凝胶纳米结构模型,分析3个龄期波特兰水化水泥浆体中C-S-H凝胶的微结构,并计算形成Q1聚合态的能量。研究发现:波特兰水泥水化生成的C-S-H与矿物1.4 nm-tobermorite(T)和jennite(J)结构存在差异;波特兰水泥水化初期形成的C-S-H是二聚体,结构中可能含有Ca—OH,质子化作用导致二聚C-S-H产生的Si—OH是C-S-H聚合度提高的关键;持续生成的单体硅酸根Q0H与具有Si—OH的二聚C-S-H发生聚合形成少量C-S-H长链;具有较少Ca—OH的链状C-S-H的产生以及Ca—OH在链状C-S-H的局部密集分别代表类T和类J环境的出现,然而在20℃水化28 d时不会大量生成链状C-S-H.
关 键 词: 水工结构;水化硅酸钙;微结构;聚合度;机理;水泥
Title: Experimental study and simulated calculation on the formation mechanism of calcium silicate hydrate (C-S-H)
Author: HE Zhen, WANG Lei, CAI Xinhua
Organization: State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University; Department of Materials and Structures, Yangtze River Scientific Research Institute
Abstract: Microstructure of calcium silicate hydrate (C-S-H) from three instars in Portland cement paste was studied by Fourier transform infrared (FTIR) spectroscopy, 29Si magic-angle spinning (MAS), nuclear magnetic resonance (NMR), respectively and from the viewpoints of several main models for the nanostructure of C-S-H. The research showed that the structure of C-S-H in Portland cement paste was different from the crystalline 1.4 nm-tobermorite(T) and jennite(J). C-S-H in cement paste at early age was dimeric and Ca—OH bonds probably occurred in it. Furthermore, the formation of Si—OH resulting from protonation of dimers was critical for increasing the polymerization degree of C-S-H gel. Polymerization between hydrated monomer formed during the hydration process and the protonated dimmers resulted in a few longer silicate chains. The chains of dreierketten with less Ca—OH bonds represented the T-like strutures and the ones with more Ca—OH bonds represented the J-like structures. However, the chains of dreierketten can not exist in a large number in the paste hydrated for 28 d at 20℃.
Key words: hydraulic structure; calcium silicate hydrate; microstructure; polymerization degree; mechanism; cement
发表期数: 2013年7月第14期
引用格式: 何真,王磊,蔡新华. 水化硅酸钙(C-S-H)结构形成机理的实验研究及模拟计算[J]. 中国科技论文在线精品论文,2013,6(14):1368-1373.
 
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