| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Research Abstract |
Recently, the historical value of brick buildings built during the Meiji and Taisho Eras has been recognized, and the number of buildings designated as cultural properties has increased. In order to keep the brick buildings in a good state of preservation, basic data on brick and the jointing which compose the brick buildings as well as the physical properties of the masonry structure consisting of the brick and the jointing must be collected. In this study, physical properties of bricks used in various brick buildings were investigated. Based on the results of the investigation, methods of repair for the brick buildings' long-term preservation were evaluated.
In order to obtain basic data on the physical properties of bricks, which are used for evaluating the possibility of the brick buildings' long-term preservation, bricks collected in various places in Japan were investigated. Consequently, it was found that various physical properties of the bricks changed according to the passage
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of time. Namely, the compressive strength and the Young's modulus decreased, the freeze-thaw resistance increased, the porosity decreased and the strain increased due to repeated dryness and moisture. Moreover, when the Young's modulus estimated from the ultrasonic pulse velocity was compared with various physical properties obtained in previous studies, although a clear relationship among the various physical properties of the bricks was hardly detected, it became clear that reinforcement of the bricks' compressive strength and lowering of the bricks' capillary tube and movement were effective for long-term preservation.
We have investigated the repair method of injecting repair materials into the unfilled joint parts of brick walls, a method which is generally adopted in brick buildings' preservation. In order to investigate the improvement in dynamic properties by this method, several bricks' materials and the mixing ratios of repairing materials for joint parts were provided. In addition, an unconfined compression test and a box shear test were performed using a brick masonry structure consisting of the brick and the jointing, in which various repairing materials were injected into the gaps in joint parts. Consequently, the difference in the fracture process between materials composing the masonry structure, and the great improvement of strength in the injected repairing materials, were confirmed. Less
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