摘要
采用Malvern动态剪切流变仪,在应力/应变2种荷载控制模式下对90#基质沥青、SBS改性沥青、岩沥青改性沥青、胶粉改性沥青、岩沥青/SBS复合改性沥青和岩沥青/胶粉复合改性沥青(RA/CRCMA)进行了时间扫描疲劳试验;采用5种疲劳失效定义方式确定了改性沥青疲劳寿命;使用统计学分析方法评价了改性沥青疲劳破坏判定指标的适用性;采用推荐指标对比分析了改性沥青的疲劳性能。研究结果表明:基于归一化动态模量确定的指标独立于荷载控制模式和沥青种类;基于相位角和累积耗散能比确定的指标显著依赖于改性沥青种类和荷载控制模式,且不具备普适性;基于耗散能变化率确定的指标仅适用于应力控制模式的疲劳寿命判断;基于简化耗散能变化率确定的指标受沥青种类影响较小,对本研究所有试验沥青均具有较好的疲劳寿命评价效果;归一化动态模量和简化耗散能变化率确定的指标在应力/应变控制模式下的相关系数高达0.94,平均绝对误差低于20%,展现出了较好的相关性及等效的疲劳寿命排序结果,由于其计算简单,定义明确,因此,推荐其作为时间扫描疲劳试验中检测沥青疲劳失效的判定标准;采用推荐指标对本研究试验沥青的疲劳寿命排序可知,添加18%胶粉和5%岩沥青的RA/CRCMA在应力/应变2种控制模式下均展现出较优的抗疲劳性能。
The malvern dynamic shear rheometer was used to conduct the time sweep fatigue tests on the 90# original binder, SBS modified asphalt, rock asphalt modified asphalt, crumb rubber modified asphalt, rock asphalt/SBS composite modified asphalt and rock asphalt/crumb rubber composite modified asphalt(RA/CRCMA) under the stress-controlled and strain-controlled modes. The corresponding fatigue life of modified asphalt was determined according to five fatigue failure definitions. The suitability of fatigue failure determination indexes of modified asphalt was evaluated by using the statistical analysis method. The fatigue performances of modified asphalts were compared and analyzed by using the recommended indexes. Research result shows that the index determined based on the normalized dynamic modulus is not affected by the load control mode and asphalt type. The indexes determined based on the phase angle and cumulative dissipative energy ratio are significantly affected by the asphalt type and load-controlled mode, and are not universal. The index determined based on the dissipated energy change rate is only suitable for the fatigue life judgment of stress-controlled mode. The index determined based on the reduced dissipated energy change rate is less affected by the asphalt type. It exhibits a preferable fatigue life evaluation effect on all asphalts in this study. The correlation coefficients of the indexes determined by the normalized dynamic modulus and the reduced dissipated energy change rate under the stress-controlled and strain-controlled modes are up to 0.94, and the mean absolute error is less than 20%, showing a good correlation and equivalent fatigue life ranking results. Due to the simple calculation and distinct definition, they are recommended to be used as the determination standard for testing the asphalt fatigue failure in time sweep fatigue test. According to the sequence of fatigue life of asphalts tested by the recommended indexes in this study, the RA/CRCMA with 18% crumb rubber and 5% rock asph
作者
王淋
郭乃胜
温彦凯
侯一烈
俞春晖
尤占平
WANG Lin;GUO Nai-sheng;WEN Yan-kai;HOU Yi-lie;YU Chun-hui;YOU Zhan-ping(Institute of Road and Bridge Engineering,Dalian Maritime University,Dalian 116026,Liaoning,China;School of Traffic and Transportation,Dalian University of Science and Technology,Dalian 116041,Liaoning,China;Department of Civil and Environmental Engineering,Michigan Technological University,Houghton 49931,Michigan,USA)
出处
《交通运输工程学报》
EI
CSCD
北大核心
2020年第4期91-106,共16页
Journal of Traffic and Transportation Engineering
基金
国家自然科学基金项目(51308084)
中央高校基本科研业务费专项资金项目(3132016223)
辽宁省自然科学基金项目(2018030659-301)。
关键词
沥青路面
动态剪切流变仪
岩沥青复合改性沥青
疲劳破坏
荷载控制模式
归一化动态模量
累积耗散能比
asphalt pavement
dynamic shear rheometer
rock asphalt composite modified asphalt
fatigue failure
load control mode
normalized dynamic modulus
cumulative dissipative energy ratio
