In recent years, the magnesium phosphate cement (MPC)-based polymer is a potential type of material to quickly repair existing structures due to some distinguished advantages. In this paper, a series of experimental studies were conducted to evaluate the effects of the nano-Al₂O₃ (NA) substitution rate, water glass (WG) substitution rate and immersion time on the bond behavior between the magnesium phosphate cement mortar (MPCM) and steel fiber (SF). The main properties of the pull-out specimens were examined, including the bond strength, energy consumption of steel fiber pull-out, and water stability of the MPCM-SF interface evaluated by the bond strength retention rate and relative bond strength retention rate. In addition, the micro analysis of the fiber-matrix interface transition zone (ITZ) were conducted by using the Scanning Electron Microscope (SEM), and the compositions analysis of the MPC paste with NA and WG were conducted by using X-Ray Diffraction (XRD). The experimental results indicated that regardless of the immersion time, the NA substitution rate of 4% and 6% had a clearer improvement on the bond behavior between MPCM and SF than those of other types of the specimens; the WG substitution rate of 1% and 2% had a more significant improvement on the bond behavior between MPCM and SF than those of other types of the specimens; the distance between the larger width crack and the steel fiber for the specimen with a NA substitution rate of 6% was larger than than those of other types of the specimens, which showed that the ITZ between MPCM and SF with NA substitution rate of 6% exhibited a denser micro-structure and better micro-mechanical properties; the micro-structure of the ITZ between MPCM and SF gradually deteriorated as the immersion time increased, which showed that the water stability of the MPCM-SF interface gradually decreased.

近年来，磷酸镁水泥（MPC）基聚合物由于一些显着的优点而成为一种潜在的快速修复现有结构的材料。在本文中，进行了一系列实验研究来评估纳米 Al ₂ O ₃(NA) 取代率、水玻璃 (WG) 取代率和浸泡时间对磷酸镁水泥砂浆 (MPCM) 与钢纤维 (SF) 之间粘结行为的影响。考察了拉拔试件的主要性能，包括粘结强度、钢纤维拉拔能耗以及通过粘结强度保留率和相对粘结强度保留率评价的 MPCM-SF 界面的水稳定性。此外，使用扫描电子显微镜（SEM）对纤维-基体界面过渡区（ITZ）进行了微观分析，并使用X射线衍射进行了含有NA和WG的MPC糊剂的成分分析（ XRD）。实验结果表明，无论浸泡时间长短，4%和6%的NA替代率对MPCM和SF之间的结合行为比其他类型的试样有更明显的改善；1%和2%的WG替代率对MPCM和SF之间的结合行为比其他类型的试样有更显着的改善；NA替代率为6%的试件的较大宽度裂纹与钢纤维之间的距离大于其他类型的试件，这表明NA替代率为6%的MPCM和SF之间的ITZ表现出更致密的微观结构和更好的微观力学性能；MPCM和SF之间的ITZ的微观结构随着浸泡时间的增加而逐渐恶化，这表明MPM-SF界面的水稳定性逐渐降低。