水在混凝土中扩散系数测定方法的研究  

Research on Test Method for Water Diffusion Coefficient in Concrete

作　　者：金珊珊[1] 张金喜[1] 张江[1,2] 王德志 

机构地区：[1]北京工业大学北京市交通工程重点实验室,北京100124 [2]首都公路发展集团公司,北京100087 [3]秦皇岛市交通局,秦皇岛066000

出　　处：《武汉理工大学学报》2009年第16期31-35,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50522201);河北省交通厅科技计划项目(Y-070112)

摘　　要：水在混凝土中的渗透性一定程度上决定了混凝土的劣化速度。目前,水渗透的评价方法主要是基于达西定律设计的水压力法,然而,随着混凝土材料和施工技术的发展,混凝土孔隙率不断降低,密实性不断提高,水压力法逐渐失去了其适用性。该文基于传递学理论,设计了吸水率试验,并通过推导得出了水在砂浆中的扩散系数的计算模型。试验及计算结果表明,该测定方法能很好地评价水在砂浆及混凝土中的渗透性。Water permeability in concrete is one of the main reasons behind deterioration of concrete. Hydraulic pressure method which is designed according to Darcy＇s law is the leading method to evaluate water permeability in concrete at present. However, with the development of concrete material and construction technology, the porosity of concrete reduces and density of concrete increases gradually, hydraulic pressure method loses applicability for evaluating water permeability. Water absorption test is designed based on transport theory, and computational model of diffusion coefficient is gained by perform mathematical calculations. The results indicate that the computational diffusion coefficient could be used to evaluate water permeability in mortar or concrete.

关 键 词：混凝土 水 渗透性 扩散 

分 类 号：TU502.3[建筑科学—建筑技术科学]