持续荷载下混凝土的氯离子扩散性能研究  

Research on Diffusion Performance of Concrete Chloride Ion under Sustained Load

作　　者：高丽燕[1] 万小梅[2] 任心波[2] 

机构地区：[1]青岛理工大学理学院,266033 [2]青岛理工大学土木学院,266033

出　　处：《混凝土与水泥制品》2012年第4期21-25,共5页China Concrete and Cement Products

基　　金：国家重点基础研究发展计划(2009CB623203);山东省自然科学基金资助项目(ZR2011EEQ031)

摘　　要：基于实际海洋环境暴露条件,研究了力学荷载作用下混凝土中的氯离子扩散性能。以Fick第二定律理论为基础,用误差函数对混凝土中随深度变化的氯离子含量分布进行了曲线拟合,从而得到氯离子表观扩散系数,并以此表征氯离子在混凝土中的传输性。分析了氯离子的扩散系数与原材料、配合比、暴露环境以及力学荷载间的关系。结果表明,力学荷载对海洋环境下混凝土中的氯离子传输性能有显著影响,在利用氯离子扩散模型预测暴露海洋环境下混凝土结构的使用寿命时,需要考虑荷载因素的影响。The diffusion performance of chloride ion in mechanical loaded concrete is studied in the conditions of actual exposure to the marine environment. Based on Fick＇s second law and the error function, the chloride content distribution along with the depth in concrete is fitted by curves and the apparent diffusion coefficients of chloride are obtained. The relationships between the diffusion coefficient of chloride and raw material, the mix proportion, the exposed environment as well as mechanical load are discussed. The results indicate that the transportation of chloride in concrete depends on the applied mechanical load remarkably. The influence of applied load factors should be considered while using the chloride diffusion model to predict the service life of concrete structure under exposed marine environment.

关 键 词：海洋环境 混凝土 持续荷载 氯离子扩散性 FICK第二定律 

分 类 号：TU528.36[建筑科学—建筑技术科学]