摘要
通过Monte Carlo概率分析的方法,结合文献查阅,对3种自行研制且含不同铬含量的低合金耐蚀钢筋在海洋环境中的腐蚀起始寿命进行了预测,重点研究了温度对钢筋腐蚀起始寿命的影响规律。结果表明:温度的升高不仅降低了钢筋腐蚀的临界氯离子含量,也提高了混凝土中氯离子的扩散系数;采用低合金耐蚀钢筋可不同程度地延长混凝土中钢筋腐蚀起始寿命,提高钢筋混凝土结构在海洋环境中的耐久性,但针对极其苛刻的服役环境应采用更为严格的防腐蚀措施。
The method of Monte Carlo probability analysis together with literature survey were used to predict the corrosion initial life of 3 kinds of corrosion resistant low alloy steel rebars with different Cr content in marine environment.The influence of temperature on the corrosion initiation life was studied as a key point.The results show that the increase of temperature not only reduced the critical chloride concentration but also increased the diffusion coefficient of chloride in concrete.Using corrosion resistant low alloy steel rebars can prolong the corrosion initial life,improve the durability of steel rebar reinforced concrete structures in marine environment.But more strict anti-corrosion measures should be taken for rebars in extremely harsh service environment.
作者
刘明
程学群
李晓刚
卢天健
LIU Ming;CHENG Xuequn;LI Xiaogang;LU Tianjian(MOE Key Laboratory for Multifunctional Materials and Structures,School of Aerospace Engineering,Xi′an Jiaotong University,Xi′an 710049,China;State Key Laboratory for Strength and Vibration of Mechanical Structure,School of Aerospace Engineering,Xi′an Jiaotong University,Xi′an 710049,China;Corrosion and Protection Center,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Ningbo Institute of Material Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China;State Key Laboratory of Mechanics and Control of Mechanical Stractures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《腐蚀与防护》
CAS
北大核心
2019年第4期281-286,共6页
Corrosion & Protection
基金
中国博士后科学基金(2017M620448)
国家自然科学基金(51801149)
关键词
耐蚀钢筋
寿命预测
温度
钢筋混凝土结构
概率分析
corrosion resistant steel rebar
life prediction
temperature
steel rebar reinforced concrete structure
probabilistic analysis
