Study on mechanism of fire retardant agent elution and fire proof performance deterioration of fire retardant treated wood in sprinkling water and drying environment

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15153
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23020:Architectural environment and building equipment-related
• Research Institution: Tokyo University of Science
• Principal Investigator: Nishio Yuhei 東京理科大学, 理工学部建築学科, 助教 (20793334)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 難燃処理木材 / 薬剤溶脱 / 防火

Outline of Final Research Achievements

When fire retardant treated wood is used in a rainy environment such as an exterior material, there is a concern that the fire proof performance may deteriorate due to elution of fire retardant agents from the surface. Investigating the relationship between the residual state of the agents and fire proof performance of the fire retardant treated wood after the weathering test, it was clarified that the fire retardant agent elution from the surface layer was more related to the fire proof performance than the residual amount of fire retardant agents. In addition, comparing 3 years natural exposure and the accelerated weathering test in this study, it was revealed that the fire retardant agent in the wood was more eluted after natural exposure.

Free Research Field

建築学

Academic Significance and Societal Importance of the Research Achievements

難燃処理木材を外装材などの降雨環境下で使用する場合、表層部の薬剤溶脱の方が防火性能の低下と関係があることが明らかとなり、経年劣化後の難燃処理木材の防火性能を評価する上での基礎資料を示した。また、自然曝露と促進耐候性試験との薬剤溶脱の違いを確認し、経年劣化を考慮した難燃処理木材の防火性能評価に関する知見が蓄積した。今後、難燃処理木材の外装材利用の促進に寄与すると考えられる。