Sol-gel method is a technique to synthesize inorganic materials based on wet-chemical reaction theory. The results have shown that reactants tetraethyl orthosilicate (TEOS) and Ca(NO_3)_2·4H_2O can form sol and gel in solution at 50-60 ℃, and the cosolvents are propyl alcohol (NPA) and H_2O, the catalyst is HNO_3. This sol-gel is burned for 12 h at 1 350-1 450 ℃ so that the organic matter, free water (moisture) in sol-gel system are removed and a solid reaction has taken place to form the resulting product. The product has been confirmed to be C_3S by XRD, SEM and ~(29)Si MAS NMR, as well as free lime content of the product which is less than 0.2% was determined by propanetriol-ethanol-method. The analysis determined by EDXA has indicated that the n(Ca)/n(Si) ratio in corresponding to micro-region is close to theoretical value of 3 : 1. This resulting product is C_3S with Si sites of Q~0 polymerization, and has higher purity and hydraulic activities at earlier age of hydration.
参考文献
| [1] | D.Stephan;H.Malcki .Influence of Cr, Ni, and Zn on the properties of pure clinker phases Part I. C3S[J].Cement and Concrete Research,1999(4):545-552. |
| [2] | H.Li;D.K.Agrawal .Formation and hydration of C3S prepared by microwave and conventional sintering[J].Cement and Concrete Research,1999(10):1611-1617. |
| [3] | LU Zhongyuan,XU Xun,XIAO Xiangqi.Effect of Grain Size of CaCO3 and SiO2 on the Formation of C3S Under Different Conditions[J].武汉理工大学学报（材料科学版）（英文版）,2007(03):533-536. |
| [4] | 冯秀平.溶胶-凝胶法合成β-C2S的早期水化[J].河海大学学报(自然科学版),2000(03):82-85. |
| [5] | 顾宇辉,古宏晨,徐宏,韩哲文.正硅酸乙酯水解过程的半经验量子化学研究[J].无机化学学报,2003(12):1301-1306. |
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