鐵尾礦加氣混凝土在蒸壓養護條件下反應機理

李德忠; 倪文; 鄭永超; 錢嘉偉; 李倩

doi:10.13374/j.issn1001-053x.2013.06.003

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鐵尾礦加氣混凝土在蒸壓養護條件下反應機理

doi: 10.13374/j.issn1001-053x.2013.06.003

1. 北京科技大學土木與環境工程學院, 北京 100083;
2. 固廢資源化利用與節能建材國家重點實驗室, 北京 100041;
3. 江蘇省建筑工程質量檢測中心有限公司, 南京 210008

基金項目:

西南科技大學固體廢物處理與資源化省部共建教育部重點實驗室開放課題(10zxgk03)

國家高技術研究發展計劃資助項目(SS2012AA062405)

詳細信息

通訊作者:
倪文,E-mail:niwen@ces.ustb.edu.cn

中圖分類號: TU522.3
計量
- 文章訪問數: 255
- HTML全文瀏覽量: 81
- PDF下載量: 6
- 被引次數: 0
出版歷程
- 收稿日期: 2012-03-16

Reaction mechanism of aerated concrete prepared by iron tailings under the condition of autoclaved curing

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

摘要

摘要: 通過X射線衍射、掃描電鏡、紅外光譜、差熱掃描熱重分析等測試方法,研究了鐵尾礦加氣混凝土在蒸壓養護條件下的反應機理.未蒸壓坯體中主要水化產物為鈣礬石、結晶度低的水化硅酸(CSH)凝膠和Ca(OH)2,鐵尾礦中部分礦物X射線衍射峰降低.經蒸壓養護后,鈣礬石的X射線衍射峰消失,托貝莫來石的X射線衍射峰增強,表明在高溫高壓和熱堿激發下,鐵尾礦中的礦物成分發生分解,活性組分SiO₂和Al₂O₃結合Ca(OH)₂發生反應,生成托貝莫來石。
- 尾礦 /
- 混凝土 /
- 養護 /
- 鈣礬石 /
- 托貝莫來石
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.
- tailings /
- concrete /
- curing /
- ettringite /
- tobermorite