长江科学院院报

• 水工结构与材料 • 上一篇    下一篇

基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

闫小虎a,b, 杨华全a,b, 石   妍a,b, 李明霞a,b   

  1. 长江科学院  a.国家大坝安全工程技术研究中心; b.水利部水工程安全与病害防治工程技术研究中心, 武汉   430010
  • 收稿日期:2011-12-12 修回日期:2012-02-22 出版日期:2013-03-01 发布日期:2013-03-26
  • 作者简介: 闫小虎(1984-),男,安徽阜阳人,助理工程师,硕士,主要从事水工混凝土及修补新材料的研究与应用
  • 基金资助:

    国家自然科学基金重点项目(50539010);中央级公益性科研院所基本科研业务费(KSF2011018/CL)

Research on Meso-damage of Cement Emulsified Asphalt Concrete under Continuous Loading by CT Scanning

YAN Xiao-hu1,2, YANG Hua-quan1,2, SHI Yan1,2, LI Ming-xia1,2   

  1. 1.Research Center of National Dam Safety Engineering Technology, Yangtze River Scientific Research Institute, Wuhan   430010, China;  2.Research Center of Water Engineering Safety and Disaster Prevention of MWR, Yangtze River Scientific Research Institute, Wuhan   430010, China
  • Received:2011-12-12 Revised:2012-02-22 Online:2013-03-01 Published:2013-03-26

摘要:

利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。

关键词: 水泥乳化沥青混凝土,  CT试验,  , CT图像,  CT数,  , 损伤变量

Abstract:

Real-time scanning observation on the meso-damage in cement emulsified asphalt concrete was carried out by means of computerized tomography (CT). The CT images of concrete samples under continuous loading were obtained. With approaches of visual analysis, CT number analysis and analysis on the relation between CT number and damage variable, it was concluded that the damage process of the cement emulsified asphalt concrete could be divided into four stages  as follows: compression, enlargement, crack expansion, and damage. Meanwhile, the concrete has toughness in the compression process. Before the ultimate load, micro-enlargement intensified into compaction for each section of the concrete; whereas after the ultimate load, damage developed to failure steadily.  

Key words: cement emulsified asphalt concrete, CT test, CT image, CT number, damage variable           

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