港珠澳大桥沉管混凝土成熟度与氯离子扩散系数相关性研究  

Correlation of chloride diffusion coefficient and concrete maturity value of Hong Kong-Zhuhai-Macao Bridge immers concrete

作　　者：黎鹏平 范志宏[1,2] 熊建波[1,2] 王胜年 

机构地区：[1]水工构造物耐久性技术交通部重点试验室,广东广州510230 [2]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《混凝土》2014年第10期31-33,37,共4页Concrete

基　　金：交通部交通运输建设科技项目(201132849A1140);国家科技支撑计划项目(2011BAG07B01)

摘　　要：采用化学结合水法、氯离子快速测定法(RCM法)和混凝土成熟度测定法研究了56 d龄期内混凝土氯离子扩散系数和混凝土成熟度的关系,结果表明:混凝土氯离子扩散系数不仅随养护龄期的延长而降低,还随养护温度的升高而降低,延长养护龄期或提高养护温度均可提高胶凝材料的水化程度;室内养护混凝土试件的氯离子扩散系数与混凝土成熟度值之间呈幂函数关系,二者具有很好的相关性(R2=0.976),利用室外养护混凝土试件的数据进行验证计算,其理论计算值与实测值具有较好的吻合性,可根据混凝土成熟度实测值预测出混凝土的氯离子扩散系数。The correlation of chloride diffusion coefficient and concrete maturity value within 56 days of curing was investigated by the chemically combined water content method,rapid chloride migration（RCM）test and concrete maturity test,respectively.The experimental results showed the chloride diffusion coefficient of concretes decreased not only with increasing curing ages,but also with increasing curing temperature,which can promote the hydration degree of cementitous.There was a significant correlation between the chloride diffusion coefficient of indoor curing specimens and the concrete maturity value when expressed as a power function（R^2=0.976）,and the calculated values of concrete maturity for outdoor specimens which obtained by using the power function agrees well with the measured values,then it can use the measured concrete maturity value to predict the chloride diffusion coefficient of concrete.

关 键 词：混凝土成熟度 氯离子扩散系数 相关性 

分 类 号：TU528.01[建筑科学—建筑技术科学]