Development of corrosion evolution model and salt removal technique for life-prolonging of weathering steel

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06181
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Yamaguchi University
• Principal Investigator: Aso Toshihiko 山口大学, 大学院創成科学研究科, 教授 (30231921)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 耐候性鋼材 / 腐食 / 補修

Outline of Final Research Achievements

To properly maintain and manage weathering steel bridges and to prolong the life, it is necessary to establish the rust evaluation method which was generated on surface of steel, the subsequent rust development prediction method and effective repair technique. In this study, the early rust growth generated by salt water on weathering steel was modeled. We also formulated the water absorption behavior due to the deliquescence of sodium chloride.
In repairing corroded weathering steel, it is necessary to remove the salt on steel surface. Therefore, in this study, attempt was made to remove the intrinsic salt content by sodium carbonate. From the result of the exposure test, no remarkable re-corrosion was observed, and it is considered that the intrinsic salt content could be removed to some extent.

Free Research Field

土木工学