[1]胡靖,钱振东.环氧沥青混合料细观尺度水损坏特性[J].东南大学学报(自然科学版),2013,43(2):355-359.[doi:10.3969/j.issn.1001-0505.2013.02.024]
 Hu Jing,Qian Zhendong.Micro-scale moisture damage characteristics in epoxy asphalt concrete[J].Journal of Southeast University (Natural Science Edition),2013,43(2):355-359.[doi:10.3969/j.issn.1001-0505.2013.02.024]
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环氧沥青混合料细观尺度水损坏特性()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第2期
页码:
355-359
栏目:
交通运输工程
出版日期:
2013-03-20

文章信息/Info

Title:
Micro-scale moisture damage characteristics in epoxy asphalt concrete
作者:
胡靖钱振东
东南大学智能运输系统研究中心, 南京210096
Author(s):
Hu Jing Qian Zhendong
Intelligent Transport System Research Center, Southeast University, Nanjing 210096, China
关键词:
有限元细观模型 水损坏 内聚力模型 沥青混凝土
Keywords:
micro finite element model moisture damage cohesive zone model asphalt concrete
分类号:
U416.2
DOI:
10.3969/j.issn.1001-0505.2013.02.024
摘要:
基于细观尺度技术研究环氧沥青混合料(EA)早期水损破坏的力学特性,建立集料-黏结界面-沥青砂浆平面细观力学有限元模型.引入内聚力模型(CZM)对集料与沥青砂浆界面进行离散,模拟EA在水分渗透过程中集料与沥青砂浆界面裂缝的萌生、扩展直至失效的过程,分析载荷与水分耦合作用下EA出现集料剥离与裂缝的力学特性.研究表明:EA的力学响应受材料含水率的影响很大,剥落主要发生在体积较大且形状不规则的集料周围;材料含水率增加会加剧沥青混合料水损破坏的程度,集料剥离呈快速增大趋势;集料四周薄弱界面区域内的沥青砂浆在受力上最为不利,极易出现水损病害.集料体积特征对EA水损破坏存在较大的影响,应控制过粗集料在混合料中所占比例.
Abstract:
The mechanical characteristics of early moisture damage of epoxy asphalt(EA)is researched based on microscopic technology, and a micro finite element model which contains aggregate, bonding interface and asphalt mortar is established. The cohesive zone model(CZM)is introduced to discrete the interface area between aggregate and asphalt mortar, and the crack initiation, extension and failure process of interface between aggregate and asphalt mortar under moisture diffusion condition is simulated. Meanwhile, the mechanical characteristics of EA when aggregate exfoliate and break due to coupling effect of moisture and load is analyzed. The results show that the moisture saturation has a great effect on the mechanical response of EA and the debonding destroy mainly appears in the peripheral area of coarse or irregular-shaped aggregate. The degree of moisture damage of asphalt mixture is aggravated if the saturation increases, and the rate of debonding failure increases sharply in high saturation. The asphalt mortar around aggregate bears worse mechanical state, and moisture damage occurs in this area easily. The moisture damage of EA is greatly affected by the volume characteristics of aggregate, so the proportion of coarse aggregate in mixture should be controlled.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 胡靖(1987—),男,博士生;钱振东(联系人),女,博士,教授,博士生导师,qianzd@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51178114).
引文格式: 胡靖,钱振东.环氧沥青混合料细观尺度水损坏特性[J].东南大学学报:自然科学版,2013,43(2):355-359. [doi:10.3969/j.issn.1001-0505.2013.02.024]
更新日期/Last Update: 2013-03-20