The disposition of the discarded tire rubber has become a worldwide problem with the quick development of auto industry. The application of recycled tire rubber (RTR) particles in cement-based materials is effective method for large-scale treatment of discarded tire rubber. Magnesium phosphate cement (MPC) is a repairing material commonly used in road and bridge engineering. In order to investigate the effects of RTR particles on the properties of MPC, sustainable rubberized MPC mortars with three different sizes were designed and prepared. The workability, mechanical properties, capillary water absorption and durability of rubberized MPC mortars were measured, and the interface zone between RTR particles and MPC matrix was characterized by Back-scattered Electron Detector (BSE). Test results indicate that the presence of RTR particles decreases the fluidity, compressive strength and bonding strength of MPC mortar at different levels, and it also decreases the capillary water absorption, increases the water resistance and volume stability to some extent. Both the content and fineness of RTR particles are key factors influencing the properties of rubberized MPC mortar. From one perspective, the difference in the interface zone between RTR particles and MPC matrix can explain the different effects of the three types of RTR particles. And MPC mortar with middle-size RTR particles has the most homogeneous microstructure.

随着汽车工业的快速发展，废弃轮胎橡胶的处置已成为世界性的问题。在水泥基材料中使用再生轮胎橡胶（RTR）颗粒是大规模处理废弃轮胎橡胶的有效方法。磷酸镁水泥（MPC）是道路和桥梁工程中常用的修补材料。为了研究RTR颗粒对MPC性能的影响，设计并制备了三种不同尺寸的可持续橡胶MPC砂浆。测量了橡胶化MPC砂浆的可加工性，机械性能，毛细吸水率和耐久性，并通过背散射电子检测器（BSE）对RTR颗粒与MPC基质之间的界面区域进行了表征。试验结果表明，RTR颗粒的存在降低了MPC砂浆在不同水平下的流动性，抗压强度和粘结强度，还降低了毛细吸水率，在一定程度上提高了耐水性和体积稳定性。RTR颗粒的含量和细度都是影响橡胶化MPC砂浆性能的关键因素。从一个角度来看，RTR颗粒与MPC基质之间的界面区域的差异可以解释这三种类型的RTR颗粒的不同作用。具有中型RTR颗粒的MPC砂浆具有最均匀的微观结构。RTR颗粒的含量和细度都是影响橡胶化MPC砂浆性能的关键因素。从一个角度来看，RTR颗粒与MPC基质之间的界面区域的差异可以解释这三种类型的RTR颗粒的不同作用。具有中型RTR颗粒的MPC砂浆具有最均匀的微观结构。RTR颗粒的含量和细度都是影响橡胶化MPC砂浆性能的关键因素。从一个角度来看，RTR颗粒与MPC基质之间的界面区域的差异可以解释这三种类型的RTR颗粒的不同作用。具有中型RTR颗粒的MPC砂浆具有最均匀的微观结构。