Freezing-Thawing Processes in Building Walls

建筑墙壁的冻融过程

• 批准号: 11450216
• 负责人: HOKOI Shuichi
• 金额: $ 6.08万
• 依托单位: KYOTO UNIVFRSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450216/
• 关键词: Freezing-Thawing; Wall Made of Soil; Heat and Mass Transfer; Damage by Freezing; Potential; Nocturnal Radiation; Fiber-glass; Moisture Equilibrium; 内部結露; 降水; 非線形方程式; 発泡系断熱材

The results obtained are summarized as follows.1. In collaboration with NRC (National Research Council, Canada), a freezing-thawing experiment was carried out where a glass-fiber sample was used as a typical insulation material. By making use of Gamma ray apparatus, the moisture (ice and water) content in the test sample was continuously measured without destroying the sample. Thus, the time history of the moisture content distribution could be obtained.2. The freezing-thawing processes in the glass-fiber wall under constant external temperatures were analyzed based on the theory of simultaneous transfer of heat and mass. By taking into account the two-dimensional distribution of the moisture and temperature distributions, a satisfactory result was obtained regarding the freezing process.3. An analysis on freezing-thawing processes in the ALC wall agreed reasonably well with the experimental results where the test sample were destroyed by the stress caused by ice accumulation.4. A survey of the frost damage, especially cracks of the building wall, was carried out in Kyoto city. Many cases were found.5. The influence that the external conditions such as rain and nocturnal radiation have on freezing-thawing processes was investigated in the relatively warm area in Japan. It was shown to be significant.

主要研究结果如下：1.与NRC（加拿大国家研究理事会）合作，进行了冻融实验，其中玻璃纤维样品被用作典型的绝缘材料。通过使用伽马射线装置，在不破坏样品的情况下连续测量测试样品中的水分（冰和水）含量。从而得到含水率分布的时间历程.基于热质同时传递理论，分析了玻璃纤维墙体在恒定外界温度下的冻融过程。考虑了二维的水分和温度分布，对冻结过程进行了模拟，得到了令人满意的结果.对ALC墙体冻融过程的分析与试验结果基本一致，试验样品被积冰引起的应力破坏。4.对京都市建筑物的冻害情况，特别是墙体裂缝进行了调查。发现了许多病例。在日本相对温暖的地区，研究了降雨和夜间辐射等外部条件对冻融过程的影响。它被证明是重要的。

项目成果

C.Iba: "Freezing-Thawing Processes in a Wall Made of Soil in Relatively Warm Area in Japan, Part2 Influence of External and Indoor Climatic Conditions"Proceedings of Cold Climatic HVAC2000. (2000)

C.Iba：“日本相对温暖地区土壤墙体的冻融过程，第 2 部分外部和室内气候条件的影响”寒冷气候 HVAC2000 论文集。

S.Hokoi: "Freezing-Thawing Processes in Gkass Fiberboard"Jounal of Thermal Envelope & Building Science. Vol.23. (2000)

S.Hokoi：“Gkass 纤维板的冻融过程”热信封杂志

畑野 雅則: "ALC壁体における凍結・融解過程に関する研究"日本建築学会計画系論文集. 545号. (2001)

Masanori Hatano：“ALC墙体冷冻和解冻过程的研究”日本建筑学会会刊，规划部，第545期。（2001年）

S.Hokoi: "Freezing-Thawing Processes in Glass Fiber Board"Journal of Thermal Envelope and Building Science. Vol.24. 42-60 (2000)

S.Hokoi：“玻璃纤维板的冻融过程”热围护结构与建筑科学杂志。

S. Hokoi, M. Hatano, M. Matsumoto: "Freezing-Thawing Processes in Glass Fiber Boardy"Journal of Thermal Envelope and Building Science. Vol. 24. 42-60 (2000)

S. Hokoi、M. Hatano、M. Matsumoto：“玻璃纤维纸板的冻融过程”热围护结构与建筑科学杂志。