Abstract: The modified scrap rubber powder (SRP) was prepared through the surface-graft technology. The structure of SRP was tested by PyGC-MS and FTIR. The results showed that the group of －SO3 was grafted onto the surface of the scrap rubber powder (SRP). The workability and mechanical properties of SRP/mortar composites were determined. The optimum ratio of modifying agent/SRP was obtained from the test of fluidity and fluidity loss. Furthermore，the modified SRP/mortar composites showed the biggest fluidity，smallest fluidity loss and highest flexural strength in comparison with original SRP/mortar composites and control mortar. The process is simple and is easy to commercialize.

摘要： 通过表面接枝改性制备了改性胶粉SRP。利用高分辨裂解气相色谱－质谱联用仪（PyGC-MS）和FTIR对SRP的结构进行了分析，测试结果表明，SRP已接枝上磺酸基团。对改性胶粉/砂浆的工作性能和力学性能进行了研究。通过流动度及流动度损失的测定，找出了胶粉（RP）和改性剂的最佳用量比；同时结果表明，改性胶粉SRP可以有效改善砂浆的流动性，并减小流动度损失；在力学性能方面，RP/砂浆复合材料的抗压和抗折强度都大幅下降，而对SRP/砂浆复合材料在保证其抗压强度的同时，实现了抗折强度的提高，材料表现出一定的韧性。胶粉改性方法简单，有利于工业生产。