海港码头混凝土表面氯离子质量分数随季节变化规律  

Concrete surface chloride ion concentration varying with seasons in marine environment

作　　者：赵羽习[1] 高祥杰[1] 许晨[1] 金伟良[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310029

出　　处：《浙江大学学报（工学版）》2009年第11期2120-2124,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金重点资助项目(50538070);国家自然科学基金资助项目(50808157);浙江省重大科技专项资助项目(2006C13090);交通部西部交通建设科技项目(200631822302-06);国家科技支撑计划课题(2006BAJ03A03-03)

摘　　要：分别在一年内的4个季节对某使用多年的海港码头同一区域结构进行现场取样,采用氯化物快速测定法分析混凝土表面和内部氯离子质量分数,并应用Fick第二定理,回归得到混凝土名义表面氯离子质量分数.据此得出海港码头混凝土表面氯离子质量分数随季节变化的规律:表面氯离子质量分数随季节变化曲线呈明显的单峰高斯分布,夏季达到峰值,而冬季最低.通过统一的数据建立基于单峰高斯方程的海港码头混凝土表面氯离子质量分数的季节影响系数经验表达式.用温度作为主要影响指标来描述海港码头混凝土表面氯离子质量分数随季节变化的规律是可行的.Concrete power collected in-situ from a 5-year-old concrete dock in four seasons respectively was tested by rapid chloride test （RCT） to analyze the chloride ion concentration in surface and inner concrete. By Fick＇s second law, the nominal chloride ion concentration in concrete surface was derived based on the inspected data. Accordingly, the law of the concrete surface chloride ion concentration varying with seasons in marine environment was concluded： the levels of surface chloride ion concentration of spring and autumn are similar and higher than that of winter; while the peak of surface chloride ion concentration appears during summer due to higher temperature, faster wind speed and longer daily immersing （wetting） time in seawater. The law can be described with temperature as main impact indicator. According to the unitary data, an empirical equation was proposed to describe the influence of seasons on surface chloride ion concentration based on a single-peak Gaussian function.

关 键 词：混凝土 表面氯离子质量分数 季节 高斯方程 

分 类 号：U657.3[交通运输工程—港口、海岸及近海工程]