Improvement on bond and anchorage properties of carbon fiber plastic rods in prestressed concrete structures

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04219
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Kanazawa Institute of Technology
• Principal Investigator: TANAKA YASUSHI 金沢工業大学, 工学部, 教授 (40377221)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: FRP / プレストレスト・コンクリート / 定着 / FEM

Outline of Final Research Achievements

In this study, we conducted research and development of mechanical anchorage devices that are necessary when FRP rods are used as concrete tensioning materials. By bonding silica sand to the rod surface to reinforce the frictional force and connecting plastic wedge-type anchors in series, it was confirmed through pull-out tests that the anchorage force could be approximately half of the tensile strength of the rods. It was also found that the metal wedge-type anchors has the same level of anchorage strength as the plastic ones by strengthening the rod surface with a hard adhesive even though the size of the anchors was much smaller. However, further improvement is needed for practical use, since premature rupture tends to occur outside the anchorage area.

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Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

従来の化学的定着具では定着作業に１週間を要するが、これが工期が遅れる原因となるので、これまでFRPロッドはプレストレスト・コンクリートに使用されてこなかった。本研究の成果を踏まえて改善をはかり、機械式定着具を開発できれば、定着作業の時間が数分に短縮される。これによって新材料であるFRPが社会インフラにも広く使用できるようになり、高耐久で軽量な構造物を製作可能となる。これまで長寿命化が難しかった海洋構造物などへの適用が期待される。