大风环境下海工混凝土抗氯离子渗透性能及寿命预测研究

Research on anti-chloride ion penetration performance and life prediction of marine concrete in strong wind environment

为提高长时间大风、高湿、高盐雾多因素综合作用下钢筋混凝土的服役寿命,围绕室内模拟水下区(HJ1)、大气区(重度盐雾与大风耦合,HJ2)、水位变动区(HJ3)3类腐蚀环境,对混凝土中氯离子渗透性能开展相关工作。结果表明,在HJ2类环境下距混凝土表层不同深度的氯离子浓度最高;采用内掺型防腐剂和外涂型水性环氧防腐涂料提高了抗氯离子渗透性能。通过Thomas模型进一步量化分析耐久性提升措施对混凝土结构服役寿命的延长效果,为提高长时间大风、高湿、高盐雾的多因素综合作用下钢筋混凝土服役寿命提供参考。

To improve the service life of reinforced concrete under the combined action of multiple factors of long-term strong wind,high humidity and high salt spray,this paper focused on three types of corrosive environment,including indoor simulated underwater area(HJ1),atmospheric area(coupling of heavy salt spray and strong wind,HJ2)and water level fluctuation area(HJ3),and carried out related work on the permeability of chloride ions in concrete.The results show that the chloride ion concentration of different depths on the concrete surface is the highest in HJ2 environment;the anti-chloride ion penetration resistance is improved using internally-doped preservatives and externally-coated water-based epoxy anti-corrosion coatings.Finally,the Thomas model is used to analyze the effect of concrete durability improvement measures further quantitatively on the service life extension of concrete structures.This work can provide reference for improving the service life of reinforced concrete under the multi-factor comprehensive action of long-term strong wind,high humidity,and high salt spray.