| 摘要: |
| 研究了氧化镁硫酸镁摩尔比n(MgO)/n(MgSO4),水硫酸镁摩尔比n(H2O)/n(MgSO4)对硫氧镁胶凝材料性能的影响及其微观机理.结果表明：固定n(H2O)/n(MgSO4)为19∶1，n(MgO)/n(MgSO4)为14∶1时硫氧镁胶凝材料力学性能最优；n(MgO)/n(MgSO4)超过14∶1后，硫氧镁胶硬化浆体中剩余MgO和Mg(OH)2的含量会增大，使硬化结构疏松，从而降低其力学性能；固定n(MgO)/n(MgSO4)为14∶1时，n(H2O)/n(MgSO4)的增大会延缓硬化硫氧镁浆体中碱式硫酸镁相的生成，造成微观结构中产生大量孔隙，从而导致其力学性能下降. |
| 关键词: 硫氧镁胶凝材料 轻烧氧化镁 七水硫酸镁 摩尔比 |
| DOI：103969/j.issn.1007 9629201801020 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51478227,51778302）；浙江省自然科学基金资助项目（LY17E080009）；宁波市自然科学基金资助项目（2017A610311） |
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| Influence of Molar Ratio on Properties of Magnesium Oxysulfate Cementitious Materials |
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BA Mingfang, ZHU Jiezhao, XUE Tao, LIU Junzhe
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Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China
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| Abstract: |
| Effects of n(MgO)/n(MgSO4), n(H2O)/n(MgSO4) on the properties and micro structural mechanism of magnesium oxysulfate(MOS) cemented materials were investigated. The results show that the most optimal mechanical properties are obtained when n(H2O)/n(MgSO4) is fixed to be 19∶1 and n(MgO)/n(MgSO4) equals to 14∶1. Micro structural analysis shows that once n(MgO)/n(MgSO4) is over 14∶1, the content of residual MgO and Mg(OH)2 in hardened paste of MOS will increase, which will loosen the structure of the hardened MOS and reduce its mechanical properties; With the increase of n(H2O)/n(MgSO4) the formation of basic magnesium sulfate phase in hardened MOS will be retarded, resulting in a large amount of pores in microstructure and decrease of mechanical properties, when n(MgO)/n(MgSO4) is 14∶1. |
| Key words: magnesium oxysulfate cemented material lightly burned magnesia seven water magnesium sulfate molar ratio |
