Mechanism of Thaumasite Formation in Concrete

查看全文 作　　者：[1]宋远明;ZHOU [1]Shaolong;WANG [1]Zhijuan;WANG [1]Bo;[2]钱觉时

机构地区：[1]School of Environmental and Materials Engineering, Yantai University, Yantai 264005, China;[2]School of Materials Science and Engi- neering, Chongqing University, Chongqing 400045, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》索引2017年第32卷第4期,共5页

基　　金：Funded by the National Natural Science Foundation of China(Nos.51272222 and 51132010) 摘　　要：Significant efforts have been made in revealing the mechanism of thaumasite formation in concrete, which continues to be fraught with ambiguities and dissension. Chemical method was employed to synthesize pure C_3S, C_2S, C_3A, ettringite, and thaumasite, and X-ray diffraction(XRD), Raman spectroscopy and infrared spectroscopy(IR) were used to identify thaumasite from other hydrates. To investigate the direct route of thaumasite formation, C_3S, C_2S, gypsum, and calcium carbonate were used to prepare a cement paste so that the interference of ettringite formation can be avoided. The indirect route of thaumasite formation was also studied by considering the effect of C_3A or ettringite content on thaumasite formation. Results show that thaumasite can be definitely generated in the absence of aluminium-bearing minerals or ettringite under appropriate conditions, while the ettringite presence promotes the thaumasite formation. No evidences support the heterogeneous nucleation route in this work. It is concluded that the method mentioned in this work can surely be used to investigate the mechanism of thaumasite formation, and thaumasite can form by both direct and woodfordite routes. 关键词：碳硫硅钙石混凝土机制形成机理钙矾石化学法合成 X射线衍射红外光谱

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Mechanism of Thaumasite Formation in Concrete

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