摘要
针对LAS试验疲劳失效判定等问题,采用13种沥青,对疲劳失效点、沥青老化、应变速率、应变扫描范围进行了研究。结果表明,适用于基质沥青疲劳试验失效判定的相位角、虚应变能并不适用改性沥青,应采用PAV老化后的试验进行试验;应力峰值失效点反应沥青真实疲劳现象,可减小样品间的误差;沥青疲劳试验结果依赖于应变速率,AASHTO TP 101采用的标准速率缺乏合理依据;应变扫描范围对试验结果影响较小,评价改性沥青应采用0.1%～70%应变扫描范围。
Aim at fatigue failure judgment of Linear Amplitude Sweep Test and other issues, fatigue fail-ure point, asphalt aging, strain rate and strain sweep range were studied by using 13 kinds of asphalt. The re-sult shows that, the judgment of phase angle and virtual strain energy are not suit for modified asphalt, while they are suit for base asphalt. Asphalt sample after PAV aging should be selected for LAS test. The stress peak shows the real fatigue phen omenon of asphalt, and can reduce the deviation. As the result of LAS test rely on strain rate, it is not reasonable to choose the standard rate by AASHTO TP 101. The influence of strain sweep range on the results is very small. It should use 0. 1 % -70% strain sweep range, when evaluate modified as-phalt fatigue property.
作者
周水文
时敬涛
张蓉
张晓华
袁野
Zhou Shui - wen;Shi Jing - tao;Zhang - Rong;Zhang Xiao - hua;Yuan Ye(Sichuan Provincial Transport Department Highway Planning, Survey, Design and Research Institute, Chengdu 611141;Research and Development Center of Technologist, Materials and Equipment for Highway Construction and Maintenance, Chengdu 611130;Sichuan Engineering Laboratory for Pavement Structural Materials and Maintenance, Chengdu 611130;Research Institute,PetroChina Fuel Oil Co. L td . ,Beijing 100089)
出处
《石油沥青》
2018年第2期27-33,共7页
Petroleum Asphalt
基金
中石油燃料油有限责任公司研究院科学研究与技术开发项目RLY-2014Y-04
关键词
LAS试验
疲劳失效
应变速率
应变扫描范围
应力峰值
Linear Amplitude Sweep Test
fatigue failure
strain rate
strain sweep range
stress peak
