Study on physical properties of materials related to the deterioration of stone monuments and brick buildings.

与石碑和砖砌建筑劣化相关的材料物理性能研究。

基本信息

批准号：
11650605
负责人：
ISHIZAKI Takeshi
金额：
$ 2.24万
依托单位：
TOKYO NATIONAL RESEARCH INSTITUTE OF CULTURAL PROPERTIES
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
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

项目摘要

(1) Experimental apparatuses were developed to measure moisture retention curve and unsaturated hydraulic conductivity of brick and mortar. The moisture retention curve and hydraulic conductivities of brick and mortar used for historical brick buildings and monuments. The measured results showed that the water content is higher for mortar than that for brick at a given water suction. The unsaturated hydraulic conductivity is higher for mortar than that for brick. The water regime of historical brick buildings and monuments was calculated with finite element method software using measured data. These study were published in Sciencefor Conservation 38,39 and reported at the ASA meeting in Salt Lake City.(2) Physical properties, such as grain size distribution, pore size distribution and specific surface area of stone, brick and compacted soil taken from historical sites were measured and related to the deterioration of the materials.(3) The frost heave test apparatus was developed to study the frost susceptibility of building materials. The experimental results showed the ice lens segregation rate is related to the temperature gradient in the frozen zone of the sample. A simple evaluation method of frost susceptibility of material was proposed. This result was published in Science for Conservation, 40.(4) Mechanism of frost deterioration of Japanese traditional earthen wall was studied. The freezing temperature, water retention curve and frost heave characteristic of composing soil were measured. The experiments showed that the surface layer was less frost susceptible than the inner layer, but if the water content exceeded a critical level, the deterioration process proceeded quickly. These studies revealed the importance of obtaining physical properties of materials to build up suitable counter measures for reducing deterioration process of cultural properties.

（1）开发了实验设备以测量砖和砂浆的水分保留曲线和不饱和水力电导率。用于历史砖建筑和纪念碑的砖和砂浆的水分保留曲线和液压电导率。测得的结果表明，在给定的水吸水处的砂浆的水含量高于砖块。迫击炮的不饱和液压电导率高于砖。使用测量的数据，使用有限元方法软件计算历史砖建筑和纪念碑的水状态。这些研究发表在Science For Conservation 38,39中，并在盐湖城举行的ASA会议上进行了报道。（2）物理特性，例如晶粒尺寸分布，孔径分布和石材，砖块和从历史上获得的特定表面积测量了位点，并与材料的恶化有关。（3）开发了霜冻测试设备以研究建筑材料的霜冻敏感性。实验结果表明，冰透镜的分离速率与样品冷冻区的温度梯度有关。提出了一种简单的评估方法对材料的易感性。该结果发表在《科学保护》中，40。（4）研究了日本传统土壁的霜冻恶化的机理。测量了冻结温度，保留曲线和霜冻的组成土壤特征。实验表明，表面层比内层易感性较小，但是如果水含量超过临界水平，则降低过程很快进行。这些研究揭示了获得材料的物理特性以建立适当的反措施来减少文化特性劣化过程的重要性。