混凝土的微观孔结构及对渗透性能的影响  

Influence of micro-pore structure on the permeability of concrete

作　　者：刘军[1] 邢锋[1] 董必钦[1] 马红岩[1] 

机构地区：[1]深圳大学土木工程系深圳市土木工程耐久性重点实验室,广东深圳518060

出　　处：《混凝土》2009年第2期32-34,共3页Concrete

基　　金：国家自然基金项目重点项目--混凝土结构耐久性及其对策的基础研究(50538060);教育部新世纪优秀人才支持计划NCET-05-0748

摘　　要：孔是混凝土微观结构中重要特性,试验采用不同水灰比的混凝土试样,测量了微观孔结构和氯离子快速渗透系数,采用氯离子快速渗透系数来表征混凝土的渗透性能。结果表明:氯离子快速扩散系数随水灰比的增大而增大,呈线性关系,采用低水灰比的混凝土,可以显著增强混凝土抗渗透的能力;平均孔径和氯离子快速渗透系数之间的相关性较强,氯离子快速渗透系数随着平均孔径的增加而增加,和混凝土的渗透性能密切相关。Porosity is an important micro-structural characteristic of concrete.The micro-pore structures and the rapid diffusion coefficients of chloride ions are determined in the experiments, and the rapid diffusion coefficient of chloride ions is used to measure the permeability of concrete.Based on data from the experiments, relation between the micro-pore structure and the rapid diffusion coefficient of chloride ions is analyzed. The results suggest that, the rapid diffusion coefficient of chloride ions is directly proportional to the water to cement ratio, in another word, low water to cement ratio leads to low permeability;mean pore diameter is well correlative to the rapid diffusion coefficient of chloride ions,the later rises with the former.

关 键 词：混凝土 孔结构 渗透性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]