多孔建筑材料液态水扩散系数的简化预测方法  

A Simplified Estimation Method for Liquid Diffusion Coefficient of Porous Building Materials

作　　者：杨寒羽 黄先奇 唐鸣放[1,2] 冯驰 YANG Hanyu;HUANG Xianqi;TANG Mingfang;FENG Chi(School of Architecture and Urban Planning,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学建筑城规学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《建筑科学》2022年第4期37-43,共7页Building Science

基　　金：国家自然科学基金“多孔建筑材料全湿度区间全吸放湿过程湿迁移机理研究”(52178065)。

摘　　要：多孔建筑材料的液态水扩散系数是围护结构湿传递模型的必备输入参数之一。由于当前尚不存在统一的测试标准,已有数据库中的液态水扩散系数往往空缺或采用估计值。本文提出1种简化预测方法,仅需要材料的吸水系数和毛细含湿量即可预测其液态水扩散系数。与X射线衰减法、标尺法和Kieβ1-Künzel法的比较表明,新方法的结果较为可靠,且预测精度比Kieβ1-Künzel法更高。新方法中修正系数k的取值对中等含湿量下的液态水扩散系数有较明显的影响,且可能与材料种类相关,还需进一步深入研究。The liquid diffusion coefficient of porous building materials is one of the required input parameters to analyze the moisture transfer in building envelopes. Due to the lack of standardized test method, the liquid diffusion coefficient in the database is often vacant or estimated. This paper proposes a simplified estimation method, which only requires the capillary absorption coefficient and capillary moisture content to estimate the liquid diffusion coefficient. Compared with the X-ray attenuation method, ruler method and Kieβ1-Künzel method, the new estimation method shows reliable results and higher prediction accuracy than the Kieβ1-Künzel method. In the new method, the correction coefficient k has a significant impact on the liquid diffusion coefficient under medium moisture content. Considering that the value of k may be related to the type of material, further research is needed.

关 键 词：多孔建筑材料 液态水扩散系数 毛细吸水实验 X射线衰减法 标尺法 Kieβ1-Künzel法 

分 类 号：TU111.19[建筑科学—建筑理论]