Analysis on fatigue cracking for asphalt surface layers based on field cores  

基于现场芯样的沥青面层疲劳开裂分析（英文）

作　　者：李强[1] 杨欢欢[1] 张帅[1] 马翔[1] 

机构地区：[1]南京林业大学土木工程学院,南京210037

出　　处：《Journal of Southeast University(English Edition)》2016年第3期356-361,共6页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51308303);the Natural Science Foundation of Jiangsu Province(No.BK20130980);Qing Lan Project,the Practice Innovation Training Program Projects for the Jiangsu College Students(No.201410298024Z);the Scientific Innovation Research of College Graduates in Jiangsu Province(No.SJLX15_0418)

摘　　要：Field cores from typical cracking locations were tested by the semi-circular bending test and the digital image correlation method to evaluate the anti-fatigue performance of different asphalt pavements. Test results were analyzed by different fatigue models. Causes of fatigue cracking for different pavement sections were determined by extraction and sieving test results. It is found that the ranking （from high to low） in terms of the anti-fatigue performance for field cores is the crumb rubber modified asphalt mixture, densegraded modified asphalt mixture, continuous graded asphalt treated base, gap-graded stone asphalt concrete, and half open-graded asphalt macadam. Compared with the half opengraded asphalt macadam, the fatigue life of the crumb rubber modified asphalt mixture improves by 2. 0 to 3. 8 times. Fatigue lives of different mixtures and distress ratios of actual pavements can be accurately predicted by the dissipated energy density ratio. Causes of fatigue cracking vary with mixture types.为了评估不同类型沥青路面的抗疲劳性能,采用半圆弯曲试验和数字图像相关法对典型裂缝处钻取 的现场芯样进行测试.分别采用不同类型疲劳模型对试验结果进行分析,并结合芯样抽提和筛分结果确定 不同路段的疲劳开裂成因. 结果表明：现场芯样的抗疲劳性能从高到低依次为改性橡胶沥青混合料、密级配改性沥青混合料、连续级配沥青稳定碎石、间断级配多碎石沥青混凝土、半开级配沥青稳定碎石;与半开级 配沥青稳定碎石相比,改性橡胶沥青混合料的疲劳寿命提高了 2 .0 -3. 8倍 ;采用耗散能密度比指标可以准 确地预估不同类型混合料的疲劳寿命和实际路面破损率;不同类型沥青混合料的疲劳开裂成因并不-致.

关 键 词：pavement engineering asphalt mixture FATIGUE 

分 类 号：U416.217[交通运输工程—道路与铁道工程]