| 摘要: |
| 针对碱矿渣水泥水化产物中不存在Ca（OH）2且碳化比较严重的现象，选择水玻璃作为碱组分，采用X 射线衍射（XRD）和可变真空扫描电子电镜（SEM）研究了碱矿渣水泥浆体的碳化产物和微观形貌，结合氮吸附方法分析了碳化对碱矿渣水泥浆体孔结构的影响.结果表明：碱矿渣水泥浆体碳化导致的孔隙溶液Ca2+浓度降低由水化硅酸钙（C S H）凝胶脱钙补偿，碳化生成的碳酸钙主要以方解石的形式存在；碳化后，C S H凝胶的钙硅比降低，浆体的比表面积增大，平均孔径降低，而累积孔体积的变化与水玻璃的模数有关. |
| 关键词: 水玻璃 碱矿渣水泥 浆体 碳化 微观结构 |
| DOI：10.3969/j.issn.10079629.2012.01.024 |
| 分类号: |
| 基金项目:国际合作项目（2009DFR50450） |
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| Influence of Carbonation on Microstructure of Alkali Activated Slag Cement Pastes |
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| Abstract: |
| In view of the phenomena that no Ca（OH）2 exsits in the hydration products of alkali slag cement and its carbonation is more serious, water glass was selected as the alkali activater, and XRD and SEM were adopted to study carbonation products and microstructure of alkali slag cement pastes, while the pore structure was researched by nitrogen adsorption. The results show that the carbonation takes place directly on the C S H gel and calcium carbonate, the carbonated product of alkali slag pastes exists mainly in the form of calcite. After carbonation, the Ca/Si of C S H gel decreases, while surface area of the pastes increases and the average pore diameter reduces. The change in cumulative volume of pores varies with mo dulus of water glass. |
| Key words: water glass alkali slag cement paste carbonation microstructure |
