海洋混凝土结构环境作用等级与耐久性设计参数的中外规范对比

围绕海洋混凝土结构的环境作用等级划分和耐久性设计参数限值，对国内外现行的混凝土结构耐久性设计规范进行了系统对比分析。首先分析了国内外14个国家和地区的32部混凝土结构耐久性设计规范的技术特点，然后对比了不同规范对于海洋氯盐环境条件和环境作用等级划分的依据和差异性，进而从最低混凝土强度等级、最大水胶比、最小胶凝材料用量、最小保护层厚度、抗氯离子渗透性指标限值、最大初始氯离子含量和最大裂缝宽度等方面，系统对比分析了不同规范对于海洋混凝土结构耐久性设计参数限值的差异性，为海洋混凝土结构的耐久性设计提供了参考。

Comparison of environmental action classes and durability design parameters of marine concrete structures between Chinese and Foreign Codes

A comprehensive comparison between Chinese and foreign durability design codes for marine concrete structures was conducted by comparing the classification criteria of environmental action classes and the allowable values of durability design parameters of marine concrete structures. Technical characteristics of 32 durability design codes from 14 different countries and regions were investigated first. Then the classification criteria of marine environmental conditions and environmental action classes for different durability design codes were compared. Moreover, the allowable values of durability design parameters (including the minimum concrete strength class, the maximum water/binder ratio, the minimum binder content, the minimum concrete cover, the chloride ion penetrability requirements, the maximum initial chloride content, and the maximum crack width) for different durability design codes were investigated systematically. Analysis results provide reference for durability design of marine concrete structures.