摘要
混凝土结构在使用过程中要经受荷载与环境的双重作用。应力水平及由此产生的微裂缝或宏观裂缝对钢筋混凝土结构的耐久性,尤其是有害物质的入侵有一定程度的影响。总结了轴向受拉、轴向受压、弯曲荷载作用下混凝土渗透性的变化规律,分析了不同荷载形式作用下混凝土内的氯离子传输,介绍了计算氯离子等效扩散系数和钢筋锈蚀速度的经验公式,提出了需要改进的建议与深入研究的方向。
Concrete structures are subjected to both mechanical loading and environmental attacks during their entire lifetime.The stress and induced cracks have important influences on the concrete durability,especially the ingress of aggressive agents,such as chloride.The influences of loading type on the permeability and chloride ingress,including tension,compression and bending loads, are discussed.In addition,some empirical equations for calculating equivalent chloride diffusion coefficient in stressed concrete are introduced.Based on current studies,some research topics deserved further studies are proposed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第11期2217-2224,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50809061
50920105806)
国家"863"计划(2007AA04Z437)资助项目
关键词
钢筋混凝土
荷载
渗透性
等效扩散系数
氯离子
reinforced concrete
loading
permeability
equivalent diffusion coefficient
chloride
