摘要
为评价硬质沥青的疲劳性能,通过旋转薄膜烘箱试验(RTFOT)和压力老化试验(PAV),选用具有代表性的四种硬质沥青和对比试样SBS改性沥青进行了短期老化和长期老化,采用不同温度下的线性振幅扫描试验(LAS)测试了各沥青试样的储能模量、损耗模量、剪切应变、剪切应力等疲劳参数,采用粘弹连续介质损伤模型(VECD模型)计算了沥青的疲劳寿命。结果表明:不同程度的老化均会降低硬质沥青重复荷载作用下应力-应变承受能力、抵抗损伤能力和疲劳寿命;温度升高会一定程度提升硬质沥青抵抗损伤能力和疲劳寿命,降低虚模量衰减;硬质沥青标号越高,则疲劳性能越好,不同油源的同等标号硬质沥青针入度越高,则疲劳性能越好;应力-应变曲线中峰值应力处的应变可以作为评价硬质沥青路面疲劳寿命的评价指标。
To evaluate the fatigue property of hard petroleum asphalt,select the representative four kinds of hard petroleum asphalt and SBS modified asphalt of comparative sample,five kinds asphalt were subject to short-term and long-term aging by using rolling thin film oven test(RTFOT)and pressure aging vessel(PAV)test.Their fatigue parameters such as storage modulus,loss modulus,shear strain,shear stress were evaluated by linear amplitude sweep(LAS)test at different temperatures.Using viscoelastic continuum damage(VECD)model calculated the fatigue life of asphalt.The result indicate that the stress-strain withstand capacity,damage resistance and fatigue life of hard petroleum asphalt under repeated loading with aging;hard petroleum asphalt has increased resistance to damage,reduced virtual modulus attenuation,and increased fatigue life with increasing temperature;the fatigue property better with grade of hard petroleum asphalt increasing,compared with the different oil source and the same grade of hard petroleum asphalt,the fatigue property better with penetration increasing;when hard petroleum asphalt was used for low-strength pavement,it fatigue life can evaluate though strains at peak stress in stress-strain curve.
作者
张喜军
仝配配
蔺习雄
李剑新
李波
ZHANG Xijun;TONG Peipei;LIN Xixiong;LI Jianxin;LI Bo(National and Provincial Joint Engineering Laboratory of Road&Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China;Research Institute of PetroChina Fuel Oil Co.,Ltd.,Beijing 100195,China;PetroChina Karamay Petrochemical Co.,Ltd.,Karamay 834003,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第18期18083-18089,共7页
Materials Reports
基金
国家自然科学基金(51668038,51868042)
甘肃省高等学校产业支撑引导项目(2020C-13)
甘肃省杰出青年基金(1606RJDA318)
甘肃省自然科学基金(1506RJZA064)
兰州交通大学百名青年优秀人才培养计划基金
甘肃省交通建设科技项目(2010-12)。
关键词
硬质沥青
线性振幅扫描
疲劳寿命
峰值应力
剪切应变
hard petroleum asphalt
linear amplitude sweep
fatigue life
peak stress
shear strain
