水道港口2024，Vol.45Issue(1)：82-91,10.
水位变动区硫酸根侵蚀对混凝土氯离子传输影响试验研究
Experimental study of the influence of sulfate attack on chloride transport in concrete in water level fluctuation zone
摘要
Abstract
The water level fluctuation zone in marine environment is the most serious zone subjected to the chloride corrosion and sulfate attack.Chloride mainly destroys the passivation film of steel bar and causes the corrosion of steel bar.Sulfate attack not only causes the deterioration of mechanical properties of concrete,but also affects the chloride transport in concrete.At present,the studies on the effects of sulfate attack on chloride transport mainly adopt the method of immersing the specimen in erosion solution,which cannot reflect the ions transport law in concrete under water level fluctuation zone where the durability problem is more serious.In this paper,the physical tests of chloride transport characteristics under single chloride solution and chloride-sulfate mixed solution were conducted under water level fluctuation zone in marine environment by the self-developed tidal cycle simulation system.The influences of sulfate attack on the chloride transport law in concrete were studied.The time-dependent formulas of concrete surface chloride concentration and apparent chloride diffusion coefficient were given.At last,the chloride diffusion model considering the effects of sulfate attack under water level fluctuation zone in marine environment was established.The results show that the chloride transport is inhibited by the filling effects of gypsum and ettringite formed by sulfate attack in concrete at the early stage,thus reducing the chloride concentration in concrete.关键词
水位变动区/混凝土/氯离子/硫酸根离子/传输特性Key words
water level fluctuation zone/concrete/chloride ion/sulfate ion/transport characteristic分类
交通工程引用本文复制引用
王栋,杜波,宋玉威,薛嘉成,王禹迟,王元战..水位变动区硫酸根侵蚀对混凝土氯离子传输影响试验研究[J].水道港口,2024,45(1):82-91,10.基金项目
国家重点研发计划项目(2022YFB2603000) （2022YFB2603000）
中央级公益性科研院所科研创新基金项目(TKS20220514) （TKS20220514）
中国路桥工程有限责任公司科研项目(2020-zlkj-10) （2020-zlkj-10）
国家自然科学基金项目(51979191) （51979191）
