【摘要】 磷酸镁水泥（MPC）砂浆与普通混凝土（NC）的界面黏结强度和破坏机理对MPC砂浆加固NC结构性能至关重要。采用双面剪切试验，重点研究了光滑、凿毛、键槽和植筋4种界面类型对MPC砂浆-NC界面黏结性能的影响规律，观察了试件破坏过程，得到了黏结强度和滑移量之间的关系曲线，分析了试件的破坏模式和破坏机理，并通过试验对比了养护龄期分别为7 d、28 d，以及不同修补砂浆抗压强度（60 MPa、55 MPa）对界面黏结性能的影响。在理论分析的基础上，结合试验数据，提出了适用于不同界面处理条件的黏结界面抗剪承载力计算公式，建立了无植筋界面的双线型本构模型和植筋界面的三线型本构模型。更多还原

【Abstract】 The interfacial bonding strength and failure mechanism of magnesium phosphate cement(MPC) mortar and ordinary concrete(NC) are very important for the structural performance of MPC mortar to reinforce NC. In this paper, the double-sided shear test was used to study the influence of four different interface types on the bonding properties of the MPC mortar-NC interface, the failure process of the specimen was observed, the relationship curve between the bond strength and the slip amount was obtained, the failure mode and failure mechanism of the specimen were analyzed. The effects of curing ages(7 days and 28 days) as well as different compressive strengths(60 MPa and 55 MPa) on the interface bonding properties were compared. On the basis of theoretical analysis and combined with the experimental data, a calculation formula for the shear capacity of the bonded interface was proposed, suitable for different interface treatment conditions. In addition, a two-line constitutive model was established for the non-planting interface, and a three-line constitutive model was developed for the planting interface. This study provides theoretical support and design basis for the application of MPC in structural reinforcement engineering.更多还原