| 摘要: |
| 推导了分别含氯离子和硫酸根的水滑石热力学参数，并采用热力学模拟研究了单一氯化钠或单一硫酸镁侵蚀，以及二者耦合侵蚀下碱矿渣水泥的相演变过程.结果表明：碱矿渣水泥在单一氯化钠侵蚀下生成Friedel盐，在单一硫酸镁侵蚀下生成单硫型水化硫铝酸钙（AFm）、钙矾石（AFt）、石膏、水化硅酸镁和含硫酸根水滑石；氯化钠与硫酸镁耦合侵蚀不仅具有单一氯化钠或单一硫酸镁侵蚀的特点，还显示出耦合效应，促使含氯离子水滑石生成，抑制Friedel盐和水化硅酸镁的生成；提高硫酸镁耦合比例会降低碱矿渣水泥固化氯离子的能力. |
| 关键词: 碱矿渣水泥 氯化钠 硫酸镁 耦合侵蚀 相演变 热力学模拟 |
| DOI：10.3969/j.issn.1007-9629.2023.01.002 |
| 分类号:TQ172 |
| 基金项目:中央高校基本科研业务费专项资金资助项目（HUST：2020kfyXJJS038）；国家自然科学基金资助项目（51608402） |
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| Thermodynamic Modelling of Phase Evolution in Alkali-Activated Slag Cement upon Combined Attack of Salts |
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ZUO Yibing1, LIAO Yishun2, YE Guang3
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1.School of Civil and Hydraulic Engineering， Huazhong University of Science and Technology， Wuhan 430074， China;2.School of Urban Construction， Wuhan University of Science and Technology， Wuhan 430065， China;3.Faculty of Civil Engineering and Geosciences， Delft University of Technology， Delft 2628 CN， Netherlands
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| Abstract: |
| Thermodynamic parameters of chloride and sulfate intercalated hydrotalcites were deduced. The phase evolutions in alkali-activated slag cement upon only sodium chloride or only magnesium sulfate attack and combined attack of those two salts were investigated via thermodynamic modelling. Friedel's salt was predicted to form under sodium chloride attack， while monosulfate， ettringite， gypsum， magnesium silicate hydrate and sulfate intercalated hydrotalcite were predicted to form upon magnesium sulfate attack. The combined attack of sodium chloride and magnesium sulfate exhibited not only characteristics by single attack of those two salts but also coupling effects which promoted the formation of chloride intercalated hydrotalcite and inhibited the formation of Friedel's salt and magnesium silicate hydrate. An increase of the magnesium sulfate proportion led to lower capacity of chemically binding chloride. |
| Key words: alkali-activated slag cement sodium chloride magnesium sulfate combined attack phase evolution thermodynamic modelling |
