Applicability of Non-Destructive Testing Methods to Historical Buildings Focusing on Brick Structure

（1）温莎针贯入法：通过大量的试验，提出了温莎针贯入阻力与砖、水泥砂浆和熟石灰砂浆抗压强度之间的关系式。（2）电磁雷达法：在时域有限差分法的基础上，利用作者发展的解析法，提出了改善电磁雷达仪器内部成像的方法。（3）红外热像法：提出了考虑颜色参数和太阳光吸收率来消除表面颜色和表面粗糙度对热像的影响的方法，以及利用数码相机测量的照度分布来改善人工光源获得的热像的方法。 关于我们 提出了（4）用表面颜色评价砂浆力学性能的方法：研究了表面颜色与砂浆的含水量、配合比、龄期、强度、动态弹性模量等力学性能的关系，明确了颜色、含水量、配合比与砂浆力学性能之间存在着比较相关性。（5）通过钻头的切削来估计表面强度的方法：利用自行研制的钻孔锚固装置，对砂浆和陶瓦的表面强度进行了相关曲线的估算; 2.无损检测方法在历史建筑检测中的适用性研究（建于1750年，砖结构，意大利国宝），飞艇的吊架（1919年建成，钢筋混凝土结构，意大利国宝），罗坎吉大桥（1920年建成，石结构，大分县），砖烟囱（爱知县），日本大学大楼（1971年建成，钢筋混凝土结构，千叶县）等，并证实了这些无损检测方法的适用性。少

The results of this study are summarized as follows :1.Study on Various Non-Destructive Testing Methods(1)Windsor Pin Penetration Method : The equations expressing the relationship between penetration resistance of Windsor pin and compressive strength of brick, cement mortar and slaked lime mortar which was used in many historical brick structures in Europe were proposed based on a wide range of experiments.(2)Electromagnetic Radar Method : The method for improving internal image obtained by electromagnetic radar apparatus was proposed by using the analytical method developed by the authors based on the finite difference time domain method.(3)Infrared Thermography Method : The method for eliminating the effects of surface color and surface roughness on thermographic image by considering color parameters and absorption rate of sunlight, and the method for improving thermographic image obtained by artificial light by using the distribution of illumination measured by digital camera were … More proposed.(4)Method for Estimating Mechanical Characteristics of Mortar by Surface Color : The relationships between surface color and water content, mix proportion, age, mechanical characteristics of mortar such as strength and dynamic modulus of elasticity were investigated, and it was clarified that there is a comparative correlation between color, water content, mix proportion and mechanical properties.(5)Method for Estimating Surface Strength by Anchoring of Drill : Correlation curves for estimating the surface strength of mortar and terracotta by using the drill-anchoring apparatus developed by the authors.2.Study on Applicability of Non-Destructive Testing Methods to Diagnosis of Historical BuildingsNon-destructive testing methods mentioned above were applied to the diagnosis of deterioration of historical buildings such as the Sanctuary of Vicoforte (constructed at 1750, brick structure, national treasure of Italy), a hanger of airship (constructed at 1919, reinforced concrete structure, national treasure of Italy), the Rakanji bridge (constructed at 1920, stone structure, Oita Prefecture), brick chimneys (Aichi Prefecture), a building of Nihon University (constructed at 1971, reinforced concrete structure, Chiba Prefecture) etc., and the applicability of these non-destructive testing methods was confirmed. Less