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北海道北見市において発生した煉瓦の凍害現象 Frost Damage to Bricks Observed in Kitami City, Hokkaido 中村, 大 Nakamura, Dai 中村 Nakamura 大 Dai 後藤, 隆司 伊藤, 陽司 山下, 聡 Yamashita, Satoshi 山下 Yamashita 聡 Satoshi 鈴木, 輝之 山崎, 新太郎 open access c2011 一般社団法人　資源・素材学会 Brick Frost Damage Freeze-Thaw Frost Heave Temperature Distribution At two different locations in Kitami City, Hokkaido, cracks have been found in bricks, seemingly due to frost damage. In this research, the mechanism of the occurrence of the cracks in the bricks has been looked into through field investigations and exposure experiment. The field investigations have revealed that some bricks located in sun-exposed areas have a higher frequency to crack and cracks occur in the protruded part of bricks. From the exposure experiment, cracks in the bricks have been found to occur in late winter from the end of February to the end of March. It has also been confirmed that the following unique temperature distribution exists when cracks occur in bricks; in late winter, bricks melt due to the daytime heat. If bricks do not melt completely during the daytime leaving some frozen parts and these remain overnight, the melted areas created during the daytime then refreeze surrounded by the frozen parts due to the low night temperatures. In this research, this frost damage caused by such temperature distribution has been defined as closed-type freeze-thaw phenomenon. From the above results, this article describes the mechanism of frost damage to bricks in Kitami City. The research results are considered useful when brick structures are built in cold regions like Hokkaido, ensuring the appropriate use of bricks. 一般社団法人　資源・素材学会 2011 jpn journal article VoR https://kitami-it.repo.nii.ac.jp/records/8154 http://doi.org/10.2473/journalofmmij.127.219 資源と素材 127 4,5 219 229 https://kitami-it.repo.nii.ac.jp/record/8154/files/2011_北海道北見市において発生した煉瓦の凍害現象.pdf application/pdf 2.7 MB 2016-04-04