Repair and restoration of termite damaged CLT

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04341
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Imamoto Kei-ichi 東京理科大学, 工学部建築学科, 教授 (60337300)
• Co-Investigator(Kenkyū-buntansha): 清原 千鶴 東京理科大学, 工学部建築学科, 客員研究員 (00284787) ; 大塚 亜希子 秋田県立大学, システム科学技術学部, 助教 (00825101)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: CLT / 蟻害 / X線 / 非・微破壊診断 / 樹脂 / 補強

Outline of Final Research Achievements

CLT is an abbreviation for Cross Laminated Timber, and in recent years it has been expected to be applied to mid-to-high-rise buildings. This study examines the evaluation method of CLT damaged by ants.
The findings obtained in this study are shown below. 1) It was confirmed that independent eating scars were generated inside the deteriorated CLT. 2) In the existing methods of diagnosing deterioration, such as ultrasonic propagation velocity tests and perforation resistance tests, there is a correlation between the measured values and the mass corrosion rate, suggesting that they may be used as methods for diagnosing damage to CLT members. Shown. 3) It was confirmed that the strength of CLT damaged by ants showed a decrease in yield strength comparable to that of solid wood. This reduction was reinforced by resin injection.

Free Research Field

建築構造および材料関連

Academic Significance and Societal Importance of the Research Achievements

中・高層建築物への適用が進められているCLTの耐久性評価を行うことを目的としている。木材そのものの劣化（主に腐朽や蟻害）に関する研究はこれまでにも多数あるが，このような木質建材の蟻害などを対象とする耐久性に着目した研究はほぼ皆無であり，その意味で学術的な価値と実用性を有し，さらに今後の普及が期待される新しい建築材料において不可欠な耐久性評価を行うという言う点において独自性と創造的な価値を持つと考える。本研究を通して，より資源循環性の高い，環境負荷低減に資する社会の構築に資することができると考える。