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采用动态剪切流变试验,研究了废旧胶粉掺量、粒径、制备工艺等特性对橡胶沥青以及滤除胶粉后改性沥青高温性能的影响,在此基础上,探讨了胶粉与沥青的反应作用与颗粒作用对橡胶沥青高温性能的影响机理,发现基质沥青中加入废旧胶粉制备得到的橡胶沥青及滤除胶粉的改性沥青的车辙因子均出现了较大幅度的提升,增长幅度因废旧胶粉的工艺、掺量和粒径的不同而不同.常温法胶粉与沥青的反应较冷冻法胶粉与沥青的反应明显;大颗粒胶粉有利于胶粉与沥青的反应;增大胶粉掺量有利于胶粉与沥青的初期反应作用.常温胶粉改性沥青的颗粒作用大于相同条件下冷冻胶粉改性沥青的颗粒作用,常温法与冷冻法胶粉改性沥青的颗粒作用均随着胶粉掺量和目数的增加而增大.胶粉改性沥青的高温性能主要取决于废旧胶粉与沥青的反应作用,而橡胶沥青中胶粉的颗粒作用对其贡献较小.结果表明:废旧胶粉特性对橡胶沥青的高温性能影响显著,合理地选择废旧胶粉参数有助于制备高性能的橡胶沥青.
Dynamic shearing rheological tests were carried out to study the effect of rubber powder, particle size and preparation technology on rubber bitumen and high temperature performance of modified bitumen after filter rubber powder. On this basis, the effects of rubber powder and The reaction mechanism of asphalt and the effect mechanism of particles on the high temperature performance of rubber asphalt were analyzed. It was found that the rutting factors of rubber asphalt prepared by using waste rubber powder and modified asphalt filter rubber powder appeared more substantial promotion, The growth rate varies with the technology, dosage and particle size of the waste rubber powder.The reaction of the rubber powder with asphalt at normal temperature is more obvious than the reaction of the rubber powder with asphalt at the normal temperature; the rubber powder with the asphalt reaction ; Increasing the content of plastic powder is conducive to the initial reaction of rubber powder and asphalt.The particle effect of modified rubber powder at room temperature is greater than that of modified rubber powder under the same conditions, The particle effect of asphalt increases with the increase of the content and mesh number of rubber powder.The high temperature performance of rubber powder modified asphalt mainly depends on the reaction of waste rubber powder and asphalt, . The results indicate that the role of its minor contribution: Waste powder characteristics significant effect on the high temperature properties of the asphalt rubber, waste rubber powder reasonable choice of parameters contribute to the preparation of high-performance rubber asphalt.