全程老化沥青中温抗疲劳性能及预测模型研究  

Study on Fatigue Resistance and Prediction Model of Whole Process Aged Asphalt atMedium Temperature

作　　者：刘亚敏[1] 韩旭晖 高晨光 钟国亮 LIU Yamin;HAN Xuhui;GAO Chenguang;ZHONG Guoliang(School of Highway,Chang an University,Xi an 710064,China)

机构地区：[1]长安大学公路学院,西安710064

出　　处：《材料导报》2024年第21期131-136,共6页Materials Reports

基　　金：国家自然科学基金(52278431;51608048);福建省交通科技项目(202236)。

摘　　要：为分析老化沥青胶结料的中温抗疲劳性能,以三种基质沥青和两种改性沥青为试验材料,基于线性振幅扫描试验和黏弹性连续损伤模型,建立了预测模型。结果表明,在线性振幅扫描试验中,随着频率的增大和老化时间的延长,沥青的复合剪切模量增大,相位角减小;改性沥青的相位角明显小于基质沥青,表明改性剂可以增强沥青胶结料的弹性;基质沥青的疲劳寿命随老化时间延长而缩短,其变化存在一个平缓过渡期;精度检验结果表明,建立的非线性预估模型拟合程度高,可用于不同老化时间沥青胶结料疲劳寿命的预测;推荐采用残留疲劳寿命作为老化沥青胶结料中温抗疲劳性能工程的判断指标,并针对不同类型沥青提出了相应技术要求。In order to analyze the medium temperature fatigue resistance of aged asphalt binders,three matrix asphalts and two modified asphalts were used as test materials,based on linear amplitude scanning tests and viscoelastic continuum damage models,a prediction model was created.The findings demonstrate that in the linear amplitude scanning test,the asphalt s composite shear modulus increases with frequency and aging time while the phase angle decreases;the phase angle of the modified asphalt is significantly smaller than that of the matrix asphalt,demonstrating that the modifier can increase the elasticity of the asphalt binder;the fatigue life of the matrix asphalt decreases with the increase of aging time,and there is a gentle transition period for its change.The accuracy test results reveal that the residual fatigue life is advised as an indicator of the medium temperature fatigue resistance of ageing asphalt binders,and the corresponding technical requirements are proposed for various types of asphalt.The results of the accuracy tests demonstrate that the non-linear prediction model is a good fit and can be used to predict the fatigue life of asphalt binders at different aging times.

关 键 词：道路工程 沥青胶结料 中温抗疲劳性能 线性振幅扫描试验 黏弹性连续损伤模型 

分 类 号：U414[交通运输工程—道路与铁道工程]