Deterioration of interfacial bond property under combined effects and prediction of performance of members after intervenion

2016 Fiscal Year Final Research Report

• Project/Area Number: 26249064
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Hokkaido University
• Principal Investigator: UEDA Tamon 北海道大学, 工学研究院, 教授 (00151796)
• Co-Investigator(Kenkyū-buntansha): 佐藤 靖彦 北海道大学, 工学(系)研究科(研究院), 准教授 (60261327) ; 古内 仁 北海道大学, 工学(系)研究科(研究院), 助教 (60165462)
• Research Collaborator: ZHANG Dawei ; KOMORI Atsuya ; TAKAHASHI Jun ; FUJIMA Seiji
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 補強設計 / 接着付着特性 / 接着工法 / 増厚工法 / 複合劣化 / 長期性能 / 接着付着特性の向上

Outline of Final Research Achievements

This study discloses that interfacial bond strength of FRP external bonding as strengthening of concrete structures slightly reduces or slightly increases after 18-months immersion of water, and that bond strengths of overlaying reduces with increase in temperature up to 60 degree but recovers partially after lowering temperature. Prediction formula for bond properties were proposed based on the test results. As technologies for enhancement of structural performance after strengthening, analytical methods of FRP external bonding with inserted polyurea resin layer, prediction model of strengthening effect by anchor bar for overlaying and prediction model for enhanced fatigue strength by resin injection into cracks were presented.
For frost attack effects, prediction models for concrete damage under combined effect with fatigue and for accelerated frost damage under combined effect with salt attack were presented together with measuring method of frost damage distribution.

Free Research Field

維持管理工学