Development of a research method to magnetically explore the corrosion status of metal reinforcements buried in road structures

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04639
• 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: University of Toyama
• Principal Investigator: Tatta Naoki 富山大学, 学術研究部都市デザイン学系, 助教 (30521314)
• Co-Investigator(Kenkyū-buntansha): 酒井 英男 富山大学, 理学部, 客員教授 (30134993)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 維持管理 / 腐食 / 磁気探査 / 鋼材 / 補強材 / 補強土壁

Outline of Final Research Achievements

Metal materials such as steel may be buried underground for various purposes. If the corrosion of these metal materials can be non-destructively tested without excavation, it would greatly benefit maintenance management and enable preventive maintenance before actual damage occurs. However, there are hardly any non-destructive assessment methods available. In this study, we aim to non-destructively assess the degree of corrosion in iron materials through a magnetic survey. We investigate changes in magnetism associated with corrosion of iron products through indoor experiments and examine the effectiveness of using magnetic surveys to non-invasively investigate corrosion conditions from the ground surface through outdoor experiments. We conclude that magnetic surveys have good potential for use in non-destructive testing of corrosion of iron materials.

Free Research Field

地盤工学

Academic Significance and Societal Importance of the Research Achievements

鋼材の磁性を利用して,土中での腐食状況を効率良く把握できる非破壊の調査法を開発することが研究目的である.地表・道路面から土中の鋼材の腐食状況が調査できると,広く道路構造物のメンテナンスサイクルに役立ち,補修対策にも大きく貢献できる.
本研究に適用する磁気探査は,理学分野において遺跡等の埋設物調査や地層構造の調査等に活用されている手法である.この手法を,分野の異なる工学分野の「構造物の点検」に適用することで,これまで困難であった「土中に埋設された鋼材の腐食の程度を把握する」の課題解決を目指す.この観点は,独自性が高く,また金属腐食と磁場の関係で新たな探査手法を生み出すという創造性の高い研究である.