摘要
当前研究沥青老化行为广泛采用旋转薄膜烘箱(RTFOT)、压力老化容器(PAV)等试验方法,其试验温度和压力条件与实际路面环境状况差别较大.为了研究夏季野外环境条件对沥青老化进程的影响,在沥青路面温度特征分析的基础上,自行设计了60℃烘箱老化试验.通过对沥青老化前后及不同老化时间的软化点、针入度、延度、粘度以及低温劲度模量的对比分析,研究了沥青的老化衰变行为,并采用组分试验、胶体结构以及红外光谱(IR)分析,探讨了沥青的热氧老化行为和机理.结果表明,与高温条件下剧烈的热氧老化行为不同,夏季野外气候下沥青分子发生温和的缓慢氧化,生成极性含氧大分子物质,低温性能大幅衰减,这是沥青路面耐久性不足的重要原因.
At present, rolling thin film oven test （RTFOT） and pressure aging vessel （PAV） are used to study aging behavior of asphalt, whose temperature and pressure are different from field conditions of asphalt pavement. In order to analyze influence of true condition of pavement on asphalt aging, temperature characteristic of pavement was analyzed and reasonable aging temperature was chosen, Using oven aging test at 60℃ designed, authors studied thermo-oxidative aging behavior and mechanism, by comparing properties of different aged and original asphalt, such as softening point, penetration, ductility, viscosity, stiffness, constituent analysis, colloid structure and infrared spectroscopy （IR）. The results show that retarded oxidation reaction is the main aging form in the field climate, and polar big molecules with oxygen are formed, As a result, asphalt performances especially low temperature performance deteriorates gradually, which is an important reason of asphalt pavement damage.
出处
《河北工业大学学报》
CAS
2008年第4期90-95,共6页
Journal of Hebei University of Technology
基金
西部交通建设科技项目(2006-318-812-21)
