Effect of reverse water pressure on chloride penetration within finite concrete during drying-wetting cycles

被引：29
|
作者：
Ou, Yangli [1 ]
Xu, Meijuan [1 ]
Chen, Deqiang [1 ]
Jiang, Mingjie [1 ]
Xiao, Liang [1 ]
Mei, Guoxiong [1 ,2 ]
机构：
[1] Guangxi Univ, Sch Civil Engn & Architecture, Key Lab Disaster Prevent & Struct Safety, Minist Educ, Nanning 530004, Peoples R China
[2] Guangxi Univ, Guangxi Lab Study Coral Reefs South China Sea, Nanning 530004, Peoples R China
来源：
OCEAN ENGINEERING | 2022年 / 257卷
基金：
中国国家自然科学基金;
关键词：
Finite concrete; Chloride ion invasion; Drying-wetting cycles; Seepage pressure gradient; DIFFUSION; MODEL; REINFORCEMENT; TRANSPORT; CORROSION; ENVIRONMENT; CARBONATION; BEHAVIOR; INGRESS; DEPTH;
D O I：
10.1016/j.oceaneng.2022.111606
中图分类号：
U6 [水路运输]; P75 [海洋工程];
学科分类号：
0814 ; 081505 ; 0824 ; 082401 ;
摘要：
Chloride ions invasion in a finite RC structure is significantly controlled by the hydraulic head difference between the seawater and the soil sides. In this study, the mechanism of chloride convection-diffusion penetration within the finite RC structure under the coupled effect of drying-wetting marine environment and reverse water pressure is investigated by indoor experiments and numerical modelling. The indoor exposure experiment is designed to characterize the temporal-spatial variation of chloride convection-diffusion behaviors in concrete. A chloride invasion model by considering the coupled effect of drying-wetting cycles and reverse water pressure via the COMSOL Multiphysics software is developed. The results indicated that, by comparing the application of reverse water pressure to natural drying-wetting cycles, the concrete surface chloride ion concentration is significantly reduced, and the growth of the unsaturation zone is clearly limited. Seepage pressure gradient restrains the inward transport of chloride ion in time and space within the RC structure further.
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收藏
页数：10
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