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将胶粉深度降解为类似沥青物质,制备了橡胶转化沥青(RTA);研究了RTA在紫外线(UV)老化过程中的结构与性能变化。通过流变和常规性能表征了UV老化对RTA宏观性能的影响;采用热重和红外光谱等表征了UV老化前后沥青和橡胶的微观结构变化。结果表明,随着UV老化时间的延长,基质沥青抗车辙因子增大,RTA的车辙因子和羰基指数均呈现出先增大后减小;RTA的羰基指数变化幅度小于基质沥青。深度降解橡胶释放的炭黑使RTA耐紫外线老化能力优于基质沥青。
The rubber crumb was modified into a similar asphalt material, and the rubbery transitional bitumen (RTA) was prepared. The structure and properties of RTA during UV aging were also studied. The effects of UV aging on the macroscopic properties of RTA were characterized by rheology and conventional properties. The microstructural changes of asphalt and rubber before and after UV aging were characterized by TG-IR and IR. The results showed that rutting factor and carbonyl index of RTA increased firstly and then decreased with the increase of UV aging time. The change range of carbonyl index of RTA was less than that of matrix pitch. Depth of degradation of the rubber release of carbon black RTA UV aging better than the matrix asphalt.