| 铁尾矿加气混凝土在蒸压养护条件下反应机理 |
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| 作者姓名： | 李德忠 倪文 郑永超 钱嘉伟 李倩 |
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| 作者单位： | 1. 北京科技大学土木与环境工程学院, 北京 100083; |
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| 基金项目： | 国家高技术研究发展计划（863计划）;教育部重点实验室开放基金 |
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| 摘 要： | 通过X射线衍射、扫描电镜、红外光谱、差热扫描热重分析等测试方法,研究了铁尾矿加气混凝土在蒸压养护条件下的反应机理.未蒸压坯体中主要水化产物为钙矾石、结晶度低的水化硅酸(CSH)凝胶和Ca(OH)2,铁尾矿中部分矿物X射线衍射峰降低.经蒸压养护后,钙矾石的X射线衍射峰消失,托贝莫来石的X射线衍射峰增强,表明在高温高压和热碱激发下,铁尾矿中的矿物成分发生分解,活性组分SiO2和Al2O3结合Ca(OH)2发生反应,生成托贝莫来石。
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| 关 键 词： | 尾矿 混凝土 养护 钙矾石 托贝莫来石 |
| 收稿时间： | 2012-03-16 |
Reaction mechanism of aerated concrete prepared by iron tailings under the condition of autoclaved curing |
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| Affiliation: | 1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of Solid Waste Reuse for Building Materials, Beijing 100041, China;3. Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China |
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| Abstract: | Testing methods including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform-infrared spectroscopy (FT-IR), and thermogravimetric/differential scanning calorimetry (TG-DSC) were used to study the reaction mechanism of aerated concrete prepared by iron ore tailings (IOTs) under the condition of autoclaved curing. Without autoclaved curing, major hydration products in the green body are ettringite (AFt), calcium silicate hydrate (CSH) gels with low degree of crystallinity, and Ca(OH)2. The XRD peaks of some minerals in the iron tailings reduce. After autoclaved curing, the XRD peak of ettringite disappears, but the XRD peak of tobermorite increases. It is revealed that, mineral components in the iron railings are decomposed, and reactions between the active components of SiO2, Al203, and Ca(OH)2 cause the formation of tobermorite under the conditions of high temperature, high pressure and hot alkaline activation. |
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