单轴受压混凝土的微裂缝和氯离子侵入性  

Microcracking and Chloride Penetration of Concrete under Uniaxial Compression

作　　者：万小梅[1] 苏卿[2] 赵铁军[1] 任心波[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]同济大学土木学院,上海200092

出　　处：《土木建筑与环境工程》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)

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.

关 键 词：混凝土 单轴压力 微裂缝 氯离子 比裂缝面积 

分 类 号：TU528.1[建筑科学—建筑技术科学]