摘要
为研究热再生沥青混合料的疲劳特性,基于四点弯曲试验分析了旧沥青混合料(RAP)掺量、应变水平、加载频率等因素对热再生沥青混合料疲劳寿命的影响规律,并与APA疲劳试验结果进行了比较验证。结果表明:四点弯曲试验与APA试验结果具有一致性,随着RAP掺量增加,混合料疲劳寿命不断降低,当RAP掺量大于30%时,降低幅度尤为明显;热再生沥青混合料疲劳寿命与施加应变值满足幂函数疲劳方程,RAP掺量越高试件疲劳寿命对荷载水平变化越敏感;试验中提高加载频率,试件的疲劳寿命随之增加,且在低应变水平下,加载频率变化引起试件的疲劳寿命差异更大。
To obtain fatigue characteristics of asphalt mixture containing recycled asphalt pave- ment, the influence rule of RAP proportion, strain level and loading frequency on fatigue life of mixture were invested based on four - point bending fatigue tests whose results were compared and verified by the asphalt pavement analyser （APA）. Results show that presence of RAP in mixture causes a decrease in the mixture＇ s fatigue life, and the reduction is especially striking when the proportion of RAP is over 30%. The power function model is suitable for describing the relationship between fatigue life and strain level, which present the fact that the fatigue life is more sensitive to changes in strain level when there are more RAP in asphalt mixture. In addition, increase in loading frequency results in an increase in the fatigue lives of asphalt mixture, and the difference in fatigue lives at different loading frequencies is found to be higher at lower stress levels.
作者
张科
郑鑫
张旭
ZHANG Ke ZHENG Xin ZHANG Xu(China Petroleum Pipeline Engineering Corporation,Langfang, Hehei 065000 ,Chin)
出处
《公路工程》
北大核心
2017年第1期228-232,共5页
Highway Engineering
关键词
热再生沥青混合料
四点弯曲试验
APA疲劳试验
疲劳寿命比
加载频率
reclaimed asphalt pavement （RAP）
four-point bending fatigue test
APA fatiguetests
fatigue life ratio
loading frequency
