摘要
为研究橡胶改性沥青的自愈性能,从橡胶沥青的黏弹特性出发,测试了温度、持续时间对橡胶沥青黏弹性能的影响,分析基于黏弹理论的橡胶沥青自愈性能。采用DSR流变仪分析研究了温度扫描和时间扫描模式下橡胶沥青的自愈性能,评价了粉胶比、应力大小、损伤度对橡胶沥青自愈性能的影响,建立了橡胶沥青的自愈指数——损伤度的数学模型。研究结果表明:温度越高,持续时间越长,沥青材料的黏度越低,从而提高了分子的流态特性,有利于沥青材料实现自愈合;随着粉胶比的增加,橡胶沥青的布氏黏度逐渐增大,自愈能力降低;作用应力越大,自愈能力越小;自愈期前后的初始模量和损伤度基本相同,表明橡胶沥青实现了自修复,自愈性能较好;沥青材料自愈合性能与损伤度成反比,损伤度越大,材料的可恢复性越小,自愈合性能越不显著;通过自愈合指数方程,能够较准确预测不同损伤度条件下沥青材料的自愈合能力。
In order to study the self-healing property of rubber modified asphalt,the influence of temperature and duration on the viscoelastic property of rubber asphalt is tested in this paper starting from the viscoelastic properties of rubber asphalt,and the self-healing property of rubber asphalt based on the viscoelastic theory is analyzed.The DSR is used to analyze and study the self-healing properties of rubber asphalt under temperature scanning and time scanning modes.The effects of filler-bitumen ratio,stress and damage degree on the self-healing property of rubber asphalt are evaluated,and the mathematical model of self-healing index to damage degree of rubber asphalt is established.The results show that the viscosity of the asphalt material will become lower under higher the temperature and longer the duration,therefore increase the flow characteristic of rubber asphalt is beneficial to realize self-healing of asphalt materials.With the increase of filler-bitumen ratio,the viscosity of rubber asphalt increases and its selfhealing ability decreases.The larger the stress is,the smaller the self-healing ability will be.The selfhealing property of asphalt materials is inversely proportional to the damage degree.The higher damage degree is,the smaller the material restorability and the less significant the self-healing property will be.Through the self-healing index equation,the self-healing ability of asphalt materials with different damage degree can be predicted more accurately.
作者
禤炜安
熊剑平
韦万峰
XUAN Wei-an;XIONG Jian-ping;WEI Wan-feng(Guangxi Key Lab of Road Structure and Materials,Nanning 530007,China;Research and Development Center on Technologies,Materials and Equipment of High Grade Highway Construction and Maintenance Ministry of Transport,Nanning 530007,China;Guangxi Transportation Research&Consulting Co.Ltd.,Nanning 530007,China)
出处
《公路》
北大核心
2020年第1期195-200,共6页
Highway
基金
国家自然基金,项目编号51878075
广西科技重大专项,项目编号桂科AA18242032
广西自然基金,项目编号2018GXNSFAA294146.
关键词
道路工程
沥青材料
自愈合
黏弹特性
损伤度
road engineering
asphalt materials
self-healing
viscoelastic properties
damage degree
