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- 建筑石膏与胶凝材料
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磷酸镁水泥砂浆无机锚固剂的基本性能研究
作者：吴凌壹1，张洋1，戴梦希2，丁铸1
（1.深圳大学 土木与交通工程学院，广东 深圳 518060；
2.深圳市大鹏新区大鹏办事处，广东 深圳 518116）
2.深圳市大鹏新区大鹏办事处，广东 深圳 518116）
摘要：采用磷酸镁水泥（MPC）砂浆制备了一种新型无机锚固剂，研究了MPC砂浆的流动度和凝结时间，测试了磷酸镁水泥砂浆的抗压强度和单轴锚固拉拔强度。结果表明，粉煤灰在MPC中具有颗粒填充和化学结合2种作用，使得磷酸镁水泥砂浆的收缩应变显著减小。利用SEM、XCT扫描和3D重构分析发现，标准砂和未反应的MgO颗粒之间均匀分布着MPC水化产物，使得磷酸镁水泥砂浆具有较高的抗压强度和单轴锚固拉拔强度，MPC与钢筋之间同时存在着物理粘结和化学粘结。
关键词：建筑加固；锚固剂；磷酸镁水泥；拉拔强度
中图分类号：TU58+2 文献标识码：A 文章编号：1001-702X（2021）01-0040-05
Research on properties of potassium magnesium phosphate cement mortar as an inorganic anchoring adhesive
WU Lingyi1，ZHANG Yang1，DAI Mengxi2，DING Zhu1
1.College of Civil and Transportation Engineering，Shenzhen University，Shenzhen 518060，China；
2.Dapeng Office of Dapeng New District，Shenzhen 518116，China）
Abstract：A novel inorganic anchoring agent can be prepared by using magnesium phosphate cement（MPC） mortar. Through the research on the spread fluidity and the setting time of the magnesium phosphate cement mortar，the compressive strength and the uniaxial anchorage drawing strength of the magnesium phosphate cement mortar are tested. The results show due to the particle filling and the chemically bonding of the fly ash in MPC，the shrinkage strain of the magnesium phosphate cement mortar is obviously reduced；and the SEM，XCT scanning and the 3D reconstruction analysis are utilized，MPC hydration products are uniformly distributed between the standard sand and the unreacted MgO particles，so that the magnesium phosphate cement mortar has higher compressive strength and uniaxial anchorage drawing strength. Moreover，both physical adhere and chemical bonding are in the interface between MPC and bars.
Key words：building reinforcement，anchoring agent，potassium magnesium phosphate cement，drawing strength