摘要
荷载损伤混凝土在海水干湿交替作用下,氯离子在混凝土中的扩散规律是研究混凝土结构耐久性的重要内容。基于海水干湿循环下氯离子传输机理,将水分和氯离子在混凝土中的迁移分别表示为水分扩散和氯离子对流-扩散两种形式,得出相应的扩散方程,然后考虑混凝土损伤微裂缝的影响,得出海水干湿循环下损伤混凝土的氯离子传输模型。利用所得到的氯离子传输模型,用有限元法模拟计算海水干湿交替作用下氯离子在损伤混凝土中的迁移过程,得到的氯离子的侵蚀深度和浓度与试验结果吻合较好。
Influenced by load and chlorine salt, the diffusion of chloride ions in concrete is an important part of the research on the durabil- ity of concrete structures.Based on the chloride transportation mechanism in the drying-wetting cycles, water migration was expressed as dif- fusion mode and chloride transport was expressed as diffusion and advection mode and the water diffusion equation and chloride ion convec- tion diffusion equation are obtained.Considered the influence of darnage, a chloride transportation model is built under the dry-wet cycles and damage.The finite element method was used to simulate the water and chloride migrations in concrete and cracked concrete under wet- ting-drying cycling condition.The simulation results of the erosion depth and concentration of chloride ion are agree well with the test results.
出处
《混凝土》
CAS
北大核心
2016年第6期24-26,30,共4页
Concrete
基金
国家自然科学基金(51178020
51108015)
亚热带建筑科学国家重点实验室开放课题(2016ZA03)
关键词
干湿循环
氯离子传输
损伤混凝土
drying-wetting cycles
chloride transport
damaged concrete
