Coupling Effect of Cryogenic Freeze-Thaw Cycles and Chloride Ion Erosion Effect in Pre-Cracked Reinforced Concrete  

作　　者：Yang Li Sibo Jiang Ruixin Lan 

机构地区：[1]School of Civil Engineering and Architecture,Hubei University of Technology,Wuhan,430068,China

出　　处：《Structural Durability & Health Monitoring》2024年第3期255-276,共22页结构耐久性与健康监测（英文）

基　　金：the Key Laboratory of Intelligent Health Perception and Lakes,Ministry of Education,Hubei University of Technology(No.2020EJB004);National Natural Science Foundation of China(No.51508171);Natural Science Foundation of Hubei Province(No.2020CFB860).

摘　　要：Chloride (Cl−) ion erosion effects can seriously impact the safety and service life of marine liquefied natural gas(LNG) storage tanks and other polar offshore structures. This study investigates the impact of different low-temperaturecycles (20°C, –80°C, and −160°C) and concrete specimen crack widths (0, 0.3, and 0.6 mm) on the Cl−ion diffusion performance through rapid erosion tests conducted on pre-cracked concrete. The results show thatthe minimum temperature and crack width of freeze-thaw cycles enhance the erosive effect of chloride ions. TheCl− ion concentration and growth rate increased with the increasing crack width. Based on the experimental modeland in accordance with Fick’s second law of diffusion, the Cl− ion diffusion equation was modified by introducingcorrection factors in consideration of the freeze-thaw temperature, crack width, and their coupling effect.The experimental and fitting results obtained from this model can provide excellent reference for practical engineeringapplications.

关 键 词：Chloride ions freeze-thaw cycles cracks 

分 类 号：TU528[建筑科学—建筑技术科学]