摘要
考虑服役水工结构混凝土中因荷载作用产生可见裂缝的非连续性和非均匀性对氯离子扩散性能的影响,取一典型带裂缝混凝土块体,假定在该混凝土块体的侧面和底面最外表面处裂缝宽度相等,建立氯离子在开裂混凝土中的扩散方程,提出与裂缝宽度、裂缝平均间距、裂缝在侧面高度和底面延伸长度相关的氯离子等效扩散系数模型。研究表明,提出的预测模型可较好反映服役水工结构开裂混凝土中氯离子等效扩散系数随荷载产生裂缝宽度的变化趋势,可用于水工结构氯离子引起的构件/结构服役寿命的预测。
Considering the influence of the discontinuity and heterogeneity of the visible load-induced cracks on chloride ion diffusion in concrete in in-service reinforced concrete elements of the hydraulic structures,a typical concrete volume with one crack was taken to establish the governing equation of chloride ion transport in it.Basing on the assumption of the equal crack width of this crack at the outer lateral and bottom surfaces,the model of the chloride equivalent diffusion coefficient in cracked concrete was put forward to consider the influence of the average crack width,crack spacing and crack extending lengths in beam height and width direction.Results show that the proposed model can better reflect the variation trend of the chloride equivalent diffusion coefficient with crack width in in-service reinforced concrete elements of the hydraulic structures and can be used to predict the service life of those elements and structures under chloride environments.
作者
胡东港
王小惠
方从启
HU Donggang;WANG Xiaohui;FANG Congqi(Department of Port Channel and Coastal Engineering,College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China;Department of Civil Engineering,School of Naval Architecture,Ocean and Civil Engineerrng,Shanghai Jiaotong University,Shanghai 200240,China;Department of Civil Engineemg,School of Civil Engineering,Shanghai Normal University,Shanghai 201418,China)
出处
《混凝土》
CAS
北大核心
2022年第7期24-28,共5页
Concrete
基金
国家自然科学基金项目(51178266)
上海市国际科技合作基金项目(18200745300)。
关键词
服役钢筋混凝土构件
氯离子等效扩散系数
裂缝宽度
裂缝间距
裂缝延伸长度
in-service hydraulic structures
chloride equivalent diffusion coefficient
crack width
crack spacing
crack extending length
