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以嵌锁密实水泥混凝土为基础,探讨了橡胶粉掺量及表面改性对混凝土温度收缩的影响机制。同时借助SEM微观测试方法,对橡胶粉嵌锁密实混凝土微观界面结构进行研究,分析胶粉对混凝土温缩性能的改善机理。研究结果表明:合适掺量的未改性胶粉提高了混凝土的温缩性能;经改性后的胶粉具有较好的吸水性,进一步提高了混凝土的温缩性能;未改性胶粉的掺入使得胶粉-水泥石界面结构较为薄弱,出现孔洞,而改性胶粉混凝土中胶粉-水泥石界面结构较为致密。
Based on embedded concrete, the influence mechanism of rubber powder content and surface modification on concrete temperature shrinkage was discussed. At the same time, with microscopic test method of SEM, the microscopic interfacial structure of rubber powder lock-in compact concrete was studied, and the improvement mechanism of rubber powder on concrete temperature-shrinkability was analyzed. The results show that: the proper amount of unmodified rubber powder can improve the concrete’s thermal shrinkage property; the modified rubber powder has better water absorbability and further improve the concrete’s thermal shrinkage performance; the unmodified rubber powder Adulteration makes the cement-cement interface structure is weak, holes appear, while the modified cement-concrete powder cement - cement interface structure is more dense.