| 摘要: |
| 通过测试磷酸钾镁水泥（MKPC）浆体的水化温度、MKPC硬化体的抗压强度和早期水稳定性，分析MKPC硬化体的物相组成和显微结构，研究了酸碱组分比例对掺复合缓凝剂的MKPC性能的影响.结果表明：酸碱组分比例对掺复合缓凝剂的MKPC的抗压强度和早期水稳定性影响显著，存在最佳酸碱组分比例（质量比1∶30～1∶25），可使MKPC硬化体的抗压强度和水养护剩余强度率最高；复合缓凝剂能有效控制MKPC浆体的早期水化反应速度；掺复合缓凝剂的MKPC的最佳酸碱组分比例较掺硼砂缓凝剂的MKPC降低50%以上，成本降低25%以上；酸碱组分比例匹配的MKPC硬化体中水化产物生成量高，水化产物晶体生长完好，缺陷少，硬化体有较完善的孔结构. |
| 关键词: 磷酸钾镁水泥 酸碱组分比例 复合缓凝剂 抗压强度 水稳定性 |
| DOI：103969/j.issn1007 9629201306001 |
| 分类号: |
| 基金项目:江苏省新型环保重点实验室开放项目（AE201022）；住房和城乡建设部科研开发项目（2010 K4 38，2011 K4 23） |
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| Influences of Ratio of Acid to Base on the Properties ofMagnesium and Potassium Phosphate Cement |
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YANG Jian ming1, SHAO Yun xia2, LIU Hai3
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1.Key Laboratory for Advanced Technology Environment Protection of Jiangsu Province,Yancheng Institute of Technology, Yancheng 224051, China;2.Jiangsu Qingyun Construction Group Limited Company,Yancheng 224005, China;3.Yanchen Jianxing Engineering Group Limited Company, Yancheng 224005, China
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| Abstract: |
| Influences of ratio of acid to base on the properties of magnesium and potassium phosphate cement（MKPC） with composite retarder were investigated through testing hydration temperature of MKPC pastes, the compressive strength and water stability of hardened MKPC pastes and analyzing the phase compositions and microstructure of hardened MKPC pastes. The results indicate that there is an optimum ratio of acid to base when hardened MKPC pastes with composite retarder have high compressive strength in natural curing condition and high residual compressive strength ratio in water curing condition. Because of the effective delaying effect of composite retarder on the early hydration rate of MKPC paste, the optimum proportion of acid component of MKPC with composite retarder is decreased above 50% compared to the MKPC paste with borate retarders，which reduces its cost above 25%. In hardened MKPC paste with matched ratio of acid to base, more hydrates are formed and grow perfectly and stably with few defects and cracks insulting in perfect microstructure. |
| Key words: magnesium and potassium phosphate cement（MKPC） ratio of acid to base composite retarder compressive strength water stability |
