摘要
以常规方法制备橡胶沥青,采用TFOT试验及PAV试验对橡胶沥青进行了短期和长期热老化模拟。利用针人度、软化点、延度、弹性恢复及黏度指标对橡胶沥青老化性能进行了评价,分析了胶粉掺量、老化时间和老化温度对橡胶沥青老化性能的影响。研究表明：胶粉掺量的增加能够改善短期老化后橡胶沥青的高低温性能,但应控制掺量不能超过28%;增加老化时间、提高老化温度,都会使橡胶沥青的老化程度更严重。当老化时间超过15 h或老化温度超过193℃后,黏度会超过施工要求范围;每延长5 h老化时间,橡胶沥青的老化程度是每提高10℃老化温度的2.5~3倍。橡胶沥青的软化点与橡胶沥青老化时间显著相关,可以用来作为建立老化动力学方程的参数;橡胶沥青受长期热老化影响比短期老化更严重,但比基质沥青具有更好的长期老化性能。
This paper Used TFOT and PAV test to simulate rubber asphalt(RA) short and long term thermal aging property. Penetration, softening point, ductility, elastic recovery and viscosity was used to evaluate RA's aging property with different powder content, aging time and aging temperature. With rubber powder content increased can improve the high and low temperature performance of RA short-term aging, but the content of rubber powder should be controlled no more than 28%. Increasing the aging time and the aging temperature, the aging degree of RA is more severe. When the aging time exceeds 15h or aging temperature exceeds 193*C, the viscosity will exceed the required range of construction. The softening point was significantly associated with the aging time, so softening point can be used as one parameter in aging kinetics equation. RA is affected more seriously by long-term aging than short-term aging, but has better long-term aging property than base asphalt.
出处
《上海公路》
2014年第1期56-60,共5页
Shanghai Highways
基金
国家自然科学基金项目(50968016)
新疆维吾尔自治区高校科研计划科学研究重点项目(20081211003056781)
新疆大学校院联合项目(2006321006)
关键词
橡胶沥青
热老化
老化动力学
Rubber Asphalt
Thermal Aging
Aging Kinetics
