| 摘要: |
| 研究了矿渣合成增强剂（SE）对水泥基材料性能的影响，并借助微量热仪、X射线衍射仪（XRD）、差示扫描量热热重分析（DSC TG）、扫描电镜（SEM）和红外测试仪（IR）等分析测试手段，对SE的矿物组成和化学结构，以及水泥水化产物和微观结构进行了分析，探讨了SE的增强机理.结果表明：掺入SE可增加水泥标准稠度的用水量，显著缩短水泥凝结时间，减小水泥净浆流动度；SE对水泥基材料早期、中期和后期强度均具有良好的增强效果；SE可显著加快水泥的水化反应速率，增加水泥浆体中钙矾石（AFt）、水化硅酸钙（C S H）等水化产物的含量，但减少了Ca(OH)2晶体含量；SE含有大量高化学活性的硅、铝水合物或溶胶粒子，可与Ca(OH)2发生火山灰反应，形成更多的C S H水化产物，有助于提高水泥硬化浆体的致密性和强度. |
| 关键词: 水泥 矿渣 增强剂 强度 机理 |
| DOI：103969/j.issn.1007 9629202006002 |
| 分类号: |
| 基金项目: |
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| Effects of Slag Synthetic Strength Enhancer on Properties of Cement Based Material and Its Mechanisms |
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HU Xuan, YANG Quanbing
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Key Lab of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China
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| Abstract: |
| Effects of slag synthetic strength enhancer（SE） on the properties of cement based materials were investigated. The mineral composition and chemical structure of the SE, as well as the hydration of cement, and its hydrates and microstructure were analyzed by microcalorimeter, X ray diffraction(XRD), differential scanning calorimetry thermogravimetric analysis(DSC TG), scanning electron microscope(SEM) and infrared spectra analysis（IR）, and the strength enhancing mechanism of the SE was discussed. The results show that the addition of SE enhances the water consumption of cement standard consistency, shortens the setting time of cement and reduces the fluidity of cement paste. SE has good strengthening effect on the strength of cement based materials at early, middle and later ages. SE can significantly accelerate the hydration reaction rate of cement, and increase the amount of hydration production such as ettringite(AFt) and calcium silicate hydrate（C S H） in cement paste. but reduce the content of Ca(OH)2. SE contains lots of silica/alumina hydrates or high activated sol, which can react with Ca(OH)2 to form more C S H hydration products, thus cement hardening paste may be more compact and stronger. |
| Key words: cement slag strength enhancer strength mechanism |
