摘要
采用1种无破损微裂缝估算指标-比裂缝面积来评价单轴压力作用下混凝土棱柱体的扩展微裂缝。加压卸载后试块暴露于氯离子环境中,测得试块中的氯离子含量分布。分析了单轴压力下混凝土微裂缝的发展以及荷载、微裂缝和氯离子渗透性的相关规律。试验结果表明,在大约0.3的应力水平范围内,受压并卸载后的试块表观氯离子扩散系数普遍降低,但随着应力水平的继续提高,氯离子扩散性能开始提高并超过未加载时的氯离子扩散系数。混凝土在单轴受压并卸载的情况下,其微裂缝的发展和恢复与应力水平关系密切。比裂缝面积能够较好地表征混凝土中微裂缝的发展,有助于分析混凝土在荷载作用下产生的微裂缝对氯离子传输性能的影响。
A non microcracking in also measured a -destructive method of evaluation of specific crack area was used to characterise concrete prisms during uniaxial compression loading and unloading. Chloride profiles were fter the same concretes microcracking, stress-strength ratio and experimental results. Under compr about one third of the ultimate load coefficie specific concrete nt again. There is a close were exposed to chloride envir chloride penetration of concrete load, the apparent chloride diffu onment. The relation among were analysed based on the sion coefficient decreases until ther increase of compressive load improves the chloride between microcracking and stress-strength ratio. The crack area can be used to indicate the microcracking and study chloride transport behav under the influence of microcracking.
出处
《土木建筑与环境工程》
CSCD
北大核心
2013年第1期104-110,共7页
Journal of Civil,Architectural & Environment Engineering
基金
国家重点基础研究发展计划(2009CB623203)
山东省自然科学基金(ZR2011EEQ031)
关键词
混凝土
单轴压力
微裂缝
氯离子
比裂缝面积
concrete
uniaxial compression
micro crack
chloride
specific crack area diff index of iour into
作者简介
万小梅（1974-），女，副教授，博士，主要从事混凝土结构及材料的耐久性、力学与环境因素作用下结构物的劣化机理研究，（Email）wanxiaomeiqj@126．com
