| 摘要: |
| 测试和分析了掺复合缓凝剂（CR）的磷酸钾镁水泥（MKPC）浆体的凝结时间、水化热、液相pH值、抗压强度、物相组成和微观结构，将其与掺硼砂（NB）的MKPC浆体进行比较，研究了掺CR的MKPC浆体的水化硬化特性.结果表明：CR通过控制MKPC水化体系液相pH值，使MKPC浆体的凝结时间延长、早期水化反应速度减慢、水化体系最高温度降低、总水化放热量减少；掺CR的MKPC硬化体中主要水化产物磷酸钾镁晶体（MKP）的生成量增加、晶体生长完好、稳定性好，MKPC硬化体的微观结构更完善，后期抗压强度显著提高. |
| 关键词: 磷酸钾镁水泥 复合缓凝剂 水化热 抗压强度 微观结构 |
| DOI：10.3969/j.issn.1007 9629.2013.01.008 |
| 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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| Hydration and Hardening Characteristics of Magnesium Potassium PhosphateCement Paste Containing Composite Retarders |
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YANG Jian ming1, SHI Cai jun2, CHANG Yuan2, YANG Nan2
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1.Key Laboratory of Advanced Technology Environment Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China;2.College of Civil Engineering, Hunan University, Changsha 410082, China
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| Abstract: |
| Hydration and hardening properties of magnesium potassium phosphate cement paste(MKPC) containing composite retarders(CR) were investigated by testing and analyzing its setting time, hydration heat，compressive strength，phase component and microstructure， which were compared with those of MKPC paste with borax(NB) added. The results show that there are two heat releasing peaks on hydration temperature curve of MKPC paste with CR, and the setting time of MKPC paste is prolonged, the early hydration rate of MKPC paste is lowered, the highest temperature and total heat release of MKPC paste are decreased. The hardened MKPC paste with CR generates more main hydrates magnesium potassium phosphate hexahydrate(MgKPO4·6H2O MKP), which grows more perfectly and stably with few defects and cracks resulting in more perfect microstructure and high late compressive strength of hardened MKPC paste. |
| Key words: magnesium potassium phosphate cement(MKPC) composite retarder(CR) hydration heat compressive strength microstructure |
