SO_3含量对含三异丙醇胺水泥水化的影响  

Influence of Gypsum Content on the Hydration Properties of Cement Pastes with Triisopropanolamine

作　　者：杨长辉[1] 王巧 黄弘 YANG Chang-hui;WANG Qiao;HUANG Hong(School of Materials Science and Engineering,Chongqing University,Chongqing 400050,Chin)

机构地区：[1]重庆大学材料科学与工程学院,重庆400050

出　　处：《硅酸盐通报》2018年第7期2120-2125,共6页Bulletin of the Chinese Ceramic Society

基　　金：中央高校基金(106112015CDJXY130004);高性能土木工程材料国家重点实验室开放基金(2014CEM004)

摘　　要：通过水泥胶砂强度试验、水化热(hydration heat)测量、硬化水泥浆体的热分析(TGA)、X射线衍射分析(XRD)及定量X射线衍射分析(QXRD)、微观形貌扫描电镜(BSE)观察,研究了不同SO_3含量对含三异丙醇胺(triisopropanolamine,TIPA)硅酸盐水泥胶砂强度、水化进程和水泥浆体微观结构的影响。结果表明:SO_3含量提高有助于提高含三异丙醇胺水泥的早期强度;水化热分析结果表明在含TIPA水泥中额外加入SO_3后,水泥水化反应速率增大,水化3 d累积放热量增加,水化程度更大,且AFt-AFm的转化过程受到抑制;与含TIPA水泥水化相比,额外SO_3掺量为0.6%时,硫酸盐促进整个硅酸盐相(C_3S+C_2S)的早期水化生成更多的Ca(OH)_2(CH)参与C_4AF的水化,在一定程度上促进其反应生成更多的AFt;外掺SO_3生成的水泥石更致密。The effect of content of SO_3on mortar strength,hydration process and cement microscopic structure in the presence of TIPA were researched by measuring strength of mortar,heat of hydration,hardened cement paste thermogravimetry analysis,X-Ray Diffraction,quantitative XRD and microscopic observation by BSE.The experimental results showed that increase of SO_3content can obviously promote the Portland cement early age strength in the presence of TIPA;hydration heat with extra addition of SO_3analysis resulted in higher rate of hydration,increase of 3 d accumulation of heat,higher degree of hydration,as well as indicated that the transformation of AFt-AFm was depressed;Compared with sample with TIPA alone,the extra sulfate promoted the overall silicate（C_3S＋C_2S）reaction in early hydration which produced more CH to participate in the hydration of C_4AF,and more AFt was precipitated as well to some extent;the structure of AFt microscopic observation indicated that tendency to generate short and coarse shape,which resulted in densified paste due to twining with C-S-H gel.

关 键 词：硅酸盐水泥 三异丙醇胺 石膏 水化进程 

分 类 号：TQ172[化学工程—水泥工业]