人工气候加速作用下胶粉再生沥青老化特征及时空演变模型  

Aging Characteristics and Spatiotemporal Evolution Model of Rubberized Reclaimed Asphalt Under Acceleration of Artificial Climate

作　　者：项迁 肖飞鹏 吴杰 何文韬 李进 XIANG Qian;XIAO Fei-peng;WU Jie;HE Wen-tao;LI Jin(Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China;Lyles School of Civil Engineering,Purdue University,West Lafayette IN 47907,Indiana,USA)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]普渡大学莱尔斯土木工程学院,印第安纳西拉斐特IN47907

出　　处：《中国公路学报》2024年第12期228-243,共16页China Journal of Highway and Transport

基　　金：国家自然科学基金国际(地区)合作与交流项目(5181101600)。

摘　　要：环境气候作用下再生沥青的老化是引起再生路面性能衰减的主要内因,精准表征与预测再生沥青的老化特征随时空的演变行为,对于识别沥青老化程度及路面服役状态具有重要意义。为此,主要研究人工气候加速作用下胶粉再生沥青在时间与空间双维度的变化规律,针对老化后的胶粉再生沥青混合料中的分层抽提沥青,通过动态剪切试验、多重蠕变恢复试验以及傅立叶红外变换光谱试验明确老化特征参数的时空变化规律及材料组成的影响,求解并建立基于菲克第二定律的老化特征参数时空演变模型,并分析基于时空演变模型的老化预测。研究结果表明:胶粉再生沥青的车辙因子、不可恢复蠕变柔量的倒数、恢复率、羰基指数、芳香环指数以及亚砜基指数等老化特征参数在时间与空间维度的演变规律呈相反趋势,并且其随深度的衰减幅度在深度0~12.5 mm最大,而后逐渐趋于0;胶粉、硬质基质沥青与RAP(Reclaimed Asphalt Pavement)等材料的掺入,使得再生沥青的车辙因子、不可恢复蠕变柔量的倒数与恢复率等老化特征参数至少增长20%,而胶粉对再生沥青的官能团指数无显著影响;时空模型能较好地还原胶粉再生沥青老化特征参数的时空演变规律,模型的决定系数主要在0.9以上。基于时空演变模型预测结果表明,当表层羰基指数与时间的关系近似为平方根函数时,服役5年与10年的再生路面铣刨深度分别为0.027 m与0.086 m。研究结果可为路面管养中确定养护时期及翻修铣刨深度提供参考。The aging of reclaimed asphalt under environmental climate conditions is the main internal factor contributing to the performance degradation of regenerated pavements.Accurately characterizing and predicting the aging characteristics of recycled asphalt with respect to temporal and spatial variations is of great significance for assessing the aging degree of asphalt and the service condition of pavements.Therefore,this study mainly investigated the variation rules of rubberized reclaimed asphalt in both time and space dimensions under accelerated aging of artificial climate.Specifically,the aging characteristics of asphalt extracted from an aged rubberized reclaimed asphalt mixture in layers were investigated.The spatiotemporal variation rules of aging characteristics and the effects of material composition were clarified through dynamic shear,multiple creep recovery,and Fourier transform infrared spectroscopy tests.Then,a spatiotemporal evolution model based on Fick's second law was established,and aging prediction based on this model was analyzed.The results indicate that the evolution of aging characteristic parameters,such as rutting factor,the reciprocal of the non-recoverable creep compliance,recovery rate,carbonyl index,aromatic ring index,and sulfoxide index,have an opposite trend in both the time and space dimensions,with the greatest reduction at 0-12.5 mm in depth,gradually approaching 0 thereafter.The incorporation of rubber powder,hard matrix asphalt,and reclaimed asphalt pavement(RAP)can increase the rutting factor,reciprocal of unrecoverable creep compliance,and recovery rate of rubberized reclaimed asphalt by at least 20%,while the addition of rubber powder has no significant effect on the functional group index of reclaimed asphalt.The spatiotemporal model effectively reflects the evolution of aging characteristic parameters,with the model's coefficient of determination mostly above 0.9.Based on the spatiotemporal evolution model,the predicted results show that when the relationship between the c

关 键 词：路面工程 胶粉再生沥青 演变模型 老化特征 人工气候 时空变化 

分 类 号：U414[交通运输工程—道路与铁道工程]