硅酸盐水泥中硫酸盐特性及其对混凝土性能的影响（英文）

发布时间：2018-06-13 10:50

本文选题：硫酸盐 + 硬石膏　；参考：《硅酸盐学报》2015年10期

【摘要】：硅酸盐水泥中硫酸盐通常以碱金属硫酸盐、硫硅酸钙、硫铝酸钙、硬石膏、二水石膏等形式存在。不同类型硫酸盐在水泥中的含量分布与溶解特性以及对混凝土性能的影响有明显差异。碱金属硫酸盐是熟料中的主要硫酸盐,以硫酸钾、硫酸钠、硫酸钠钾和钾钙复盐形式存在,在参与水泥水化时快速溶出对混凝土早期性能,包括凝结时间、水泥与减水剂相容性、早期强度等有着重要影响,其中硫酸钠和硫酸钠钾复盐的不利影响更为显著。熟料中可能含有少量硬石膏,用作混合材的固硫灰渣和粉煤灰等废渣含有较高含量的硬石膏,在水泥和混凝土中作用与二水石膏相近,但含量过高时应关注其对混凝土性能可能的不利影响。贝利特含有少量硫酸盐,随着贝利特的后期缓慢水化,释放出的硫酸盐可能有利于混凝土的后期强度发展以及体积稳定性,但在早期高温养护条件下,且贝利特含量较高时,贝利特含有的硫酸盐也有可能引起后期混凝土延迟钙矾石生成甚至膨胀开裂破坏。其他类型硫酸盐包括硫铝酸钙、硫硅酸钙和钾石膏在硅酸盐水泥中的含量分布以及对混凝土性能的影响还有待更进一步的认识。
[Abstract]:Sulphate in Portland cement is usually found in the form of alkali metal sulfate, calcium sulosilicate, calcium sulphoaluminate, anhydrite, and two gypsum. The content distribution of different types of sulphates in cement is obviously different from that of the concrete. Alkali sulphate is the main sulfate in clinker, potassium sulfate and sulphuric acid. Sodium, potassium sulfate and potassium calcium salts are in the form of compound salt, and it has important influence on the early performance of concrete, including setting time, compatibility of cement and water reducing agent, early strength and so on. The adverse effect of sodium sulfate and sodium sulfate potassium salt is more significant. The waste residue, such as solid sulphur slag and fly ash, contains a high content of anhydrite, which is similar to two water gypsum in cement and concrete. But when the content is too high, it should be concerned about the possible adverse effects on the performance of concrete. Baillet contains a small amount of sulphate. With the slow hydration of Baillet, the release of sulfate may be beneficial to mixing. The development of the later strength and the volume stability of the soil, but in the early high temperature conditions and the high bilite content, the sulphate contained in the bilite may also cause the delayed ettringite formation and even the expansion cracking of the later concrete. Other types of sulphates include calcium sulphoaluminate, calcium sulphate and potassium gypsum in Portland cement. The distribution of content and its effect on concrete performance need to be further understood.
【作者单位】：重庆大学材料科学与工程学院;
【基金】：国家自然科学基金(51132010) 重庆自然科学基金(CSTC2013JJB50002)
【分类号】：TU528

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