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铝硅质矿物掺合料对磷酸钾镁水泥砂浆物理力学性能的影响

作者：吴庆1，许奇1，杨建明2，王刚1

关键字：铝,硅质,矿物,掺合,料,对,磷酸,钾镁,水泥,

　
（1.江苏科技大学  土木工程与建筑学院，江苏 镇江  212000；2.盐城工学院  土木工程学院，江苏 盐城  224051）
    摘要：采用重烧氧化镁、磷酸二氢钾、复合缓凝剂、引气型减水剂和石英砂为主要原料制备磷酸钾镁水泥（MKPC）砂浆。研究了铝硅质矿物掺合料（偏高岭土、伊利石）对MKPC物理力学性能的影响。结果表明，相同水灰比下，分别掺10%偏高岭土及10%伊利石时，MKPC砂浆的流动度较未掺加分别降低了7.5%、5.0%；掺伊利石早期表现出较好的抗压性能；60 d龄期时，掺偏高岭土的MKPC砂浆抗压强度最高；掺加铝硅质矿物掺合料提高了MKPC浆体的抗折强度，其中掺偏高岭土效果更明显。偏高岭土和伊利石中活性物质SiO2和Al2O3等对水化有促进作用，形成了磷酸铝[AlPO4和Al（PO3）3]凝胶，使水化产物及整体结构更加致密，填充效果明显。
    关键词：MKPC；砂浆；抗折强度；抗压强度；微观分析
    中图分类号：TU526        文献标识码：A        文章编号：1001-702X（2019）11-0122-05
 
Effect of aluminous silica mineral admixture on physical and mechanical properties of potassium magnesium phosphate cement mortar
WU Qing1，XU Qi1，YANG Jianming2，WANG Gang1
（1.School of Civil Engineering and Architecture，Jiangsu University of Science and Technology，Zhenjiang 212000，China；
2.School of Civil Engineering，Yancheng Institute of Technology，Yancheng 224051，China）
    Abstract：Potassium magnesium phosphate cement（MKPC） mortar was prepared by using calcined magnesia，potassium dihy-
drogen phosphate，composite retarder，bleed-type water reducing agent and quartz sand as main raw materials. The effects of aluminous siliceous mineral admixtures（metakoalin，illite） on the physical and mechanical properties of MKPC were investigated. The results showed that the fluidity of MKPC mortar decreased by 7.5% and 5.0%，respectively，when 10% metakoalin and 10% illite were added in the same water-cement ratio. In the early stage，the admixture of illite exhibited better compressive properties. At the age of 60 days，the compressive strength of MKPC mortar mixed with metakoalin is the highest. The flexural strength of MKPC paste was improved by adding aluminous siliceous mineral admixture，especially metakoalin. The active substances SiO2 and Al2O3 in metakoalin and illite promoted hydration，and form aluminum phosphate [AlPO4 and Al（PO3）3] gels，which made the hydration products and the overall structure more compact and the filling effect was obvious.
    Key words：MKPC，mortar，flexural strength，compressive strength，microscopic analysis