Evaluation of Rebar Corrosion from Dormant Stage to Acceleration Stage by Ultrasonic Method

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06166
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: The University of Tokushima
• Principal Investigator: WATANABE Takeshi 徳島大学, 大学院社会産業理工学研究部(理工学域), 准教授 (50332812)
• Co-Investigator(Kenkyū-buntansha): 橋本 親典 徳島大学, 大学院社会産業理工学研究部(理工学域), 教授 (10180829)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 超音波法 / 鉄筋腐食 / ひび割れ / 潜伏期 / 加速期 / アコースティックエミッション法

Outline of Final Research Achievements

In order to evaluate rebar corrosion process from dormant stage to acceleration stage by ultrasonic testing (UT) and acoustic emission method (AE), electrolytic corrosion tests ware applied to RC beam specimens.
As the results, it was clarified that amplitude and energy which were calculated form wave form in UT were increasing in dormant stage, and the parameter start to decrease due to corrosion induced cracks. The corrosion induces cracks were detected by AE. It is observed that the time to start increasing of micro cracks agreed with the decreasing of the decreasing of parameter in UT.

Free Research Field

コンクリート工学