Numerical modelling for predicting corrosion initiation life of reinforced concrete square piles under reverse-seepage pressure
王荣波 1吴文兵 2何思宏 3肖良 4闻敏杰 5梅国雄6
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作者信息
1. Faculty of Engineering,China University of Geosciences,Wuhan 430074,China
2. Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China
4. College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China
5. Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China
6. Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Ocean College,Zhejiang University,Zhoushan 316021,China
Square piles of reinforced concrete(RC)in marine environments are susceptible to chloride-induced corrosion.A novel reverse-seepage technique(RST)is applied to square piles to block the intrusion of chlorides.This research introduces a computational model designed to predict the lifespan of corrosion initiation in reinforced concrete square piles when applied reverse-seepage pressure.The model considers the impacts of chloride binding and the triple time-dependence property among the permeability,the corrected surface chloride concentration,and the diffusion coefficient.The proposed numerical model is solved using the alternating direction implicit(ADI)approach,and its accuracy and reliability are evaluated by contrasting the computational outcomes with the analytical solution and experimental results.Furthermore,the primary factors contributing to the corrosion of reinforced concrete square piles are analyzed.The results indicate that applying RST can decrease the chloride penetration depth and prolong the lifespan of corrosion initiation in square piles.The water-cement ratio and reverse seepage pressure are the most influential factors.A water pressure of 0.4 MPa can double the life of concrete,and the durable life of concrete with a water-cement ratio of 0.3 can reach 100 years.
关键词
反渗防腐技术/氯离子侵蚀/交替隐式差分方法/钢筋混凝土方桩/耐久性寿命
Key words
reverse-seepage technique/chloride ion intrusion/alternating direction implicit method/reinforced concrete square pile/corrosion initiation life
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