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疲劳荷载下冻融循环对CR WMA开裂特性的影响
Effect of Freeze Thaw Cycle on Cracking Characteristics of CR WMA under the Fatigue Load
投稿时间:2018-05-04  修订日期:2018-06-14
DOI:103969/j.issn.1007 9629201902011
中文关键词:  数字图像技术  冻融循环  温拌胶粉改性沥青混合料  抗裂  损伤变量
英文关键词:digital image correlation (DIC) technique  freeze thaw cycle  warm mix crumb rubber modified asphalt mixture(CR WMA)  crack resistance  damage variable
基金项目:国家自然科学基金资助项目(11762012);内蒙古交通科技项目(NJ 2015 1)
        
作者单位
王岚
WANG Lan
内蒙古工业大学土木工程学院,内蒙古呼和浩特010051
School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
罗鑫
LUO Xin
内蒙古工业大学土木工程学院,内蒙古呼和浩特010051
School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
常春清
CHANG Chunqing
内蒙古工业大学土木工程学院,内蒙古呼和浩特010051
School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
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中文摘要:
      以温拌胶粉改性沥青混合料(CRWMA)和热拌胶粉改性沥青混合料(CRHMA)为研究对象,对经盐冻融循环和水冻融循环作用下的半圆试件进行三点弯曲重复加载试验,同时利用数字图像(DIC)相关技术对其开裂特性进行研究.结果表明:采用开裂位置附近点的水平应变(EXX)和以全场水平应变定义的损伤变量均可反映CRWMA和CRHMA在疲劳荷载作用下的抗开裂性能;CRWMA和CRHMA的抗疲劳开裂性能随着盐冻融循环和水冻融循环作用次数的增加而降低,且盐冻融作用对其影响大于水冻融作用;无论盐冻融还是水冻融作用,CRWMA的抗疲劳开裂性能均优于CRHMA.
英文摘要:
      A three point bending repeated loading test was carried out on semi circular asphalt mixture with crumb rubber modified by warm mixing (CR WMA) and hot mixing (CR HMA), which was subjected to salt solution freeze thaw cycles and water solution freeze thaw cycles. At the same time, the cracking characteristics were studied by digital image correlation (DIC) technique. The results show that both the horizontal strain (EXX) and the damage variable defined by full field horizontal strain can reflect the cracking resistance of CR WMA and CR HMA under the fatigue load. The fatigue cracking resistance of CR WMA and CR HMA decreases with the increase of salt solution freeze thaw cycles and water solution freeze thaw cycles. And the effect of salt solution freeze thaw cycles is greater than that of water solution freeze thaw cycles. For both salt solution freeze thaw cycles and water solution freeze thaw cycles, the fatigue cracking resistance of CR WMA is better than that of CR HMA.
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