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Prediction of movement, reaction and accumulation of multi-component medium in porous building material

多孔建筑材料中多组分介质的运动、反应和积累的预测

基本信息

批准号：
13305039
负责人：
HOKOI Shuichi
金额：
$ 20.97万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Regarding global environmental, energy and resource problems, longer life and durability of building materials and elements are strongly required in the field of architecture. Since most of the building materials are porous, the prediction and evaluation of movement and accumulation of the moisture and other diffusing substances in porous materials with a suitable precision are very important for an improvement of their durability. The objectives of this research are, to clarify how multi-component, multi-phase media exist, transfer and react in a porous building material, to propose a simplified model, and to develop measuring apparatuses of diffusivity and potential relationships.Experiments on infiltration of acid rain (solution) and diffusion of CO2 gas into concrete sample were carried out in order to investigate the position and degree of neutralization. Based on the results, difference in neutralization rates between gas diffusion and liquid infiltration was clarified. It was al … More so shown that water permeability is significantly different depending on the vertical positions of the test sample.From a viewpoint that the moisture and mass transfer through cracks have a significant influence on neutralization, and it is also affected by the external climates, the influence that the cracks have on the results was examined analytically.A gamma-ray apparatus for man-distractive moisture content measurement was designed and produced. Based on the measured results, several issues related to measurement practice were examined and measurement errors were clarified. A new theoretical approach was proposed which describes the diffusion process of multi-components in a porous material with chemical reactions. Furthermore, a simplified -method for estimating equilibrium relationships of multi-component media was proposed and its validity was examined. In particular, porous structure of and moisture transfer process in a very thin material such as clothing was studied, and an influence that the change in potential relationships caused by salt solution has on the evaporation process. Less

考虑到全球环境、能源和资源问题，在建筑领域中强烈要求建筑材料和构件具有更长的寿命和耐久性。由于大多数建筑材料都是多孔的，因此以适当的精度预测和评估水分和其他扩散物质在多孔材料中的移动和积累对于提高其耐久性是非常重要的。为了阐明多组分、多相介质在多孔建筑材料中的存在、传递和反应机理，提出了一种简化模型，并研制了扩散系数和势函数关系的测定装置，进行了酸雨（溶液）渗透和CO2气体扩散到混凝土试样中的实验，以研究中和作用的位置和程度。根据实验结果，阐明了气体扩散和液体渗透中和速率的差异。是艾尔 ...更多信息从裂缝中的水分和质量传递对中和作用有重要影响以及受外界气候影响的角度出发，分析了裂缝对中和作用结果的影响，设计并制作了γ射线人工分散式水分测定仪。根据测量结果，对测量实践中的几个问题进行了探讨，并对测量误差进行了澄清。提出了一种新的理论方法来描述多组分在多孔材料中的化学反应扩散过程。此外，还提出了一种估算多组分介质平衡关系的简化方法，并对该方法的有效性进行了检验。特别是，多孔结构和水分在一个非常薄的材料，如衣服的传输过程进行了研究，和盐溶液引起的电位关系的变化对蒸发过程的影响。少