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2022 Fiscal Year Final Research Report

Long-term structural performance assessment of corroded reinforced concrete structures using an integrated approach of probabilistic and finite element method

Research Project

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Project/Area Number 19K15078
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionWaseda University

Principal Investigator

LIM Sopokhem  早稲田大学, 理工学術院, 講師(任期付) (60801305)

Project Period (FY) 2019-04-01 – 2023-03-31
KeywordsMaintenance and repair / Spatial steel corrosion / Spatial corrosion cracks / Finite element analysis / Current density / Galvanostatic corrosion / Reliability
Outline of Final Research Achievements

The effects of galvanostatic (GS) and artificial chloride environment (ACE) corrosion methods on the time-dependent steel corrosion and cracks of RC beams were studied using X-ray and image processing techniques. GS method applying current density lower than 50 micro amperes per cm2 is recommended to study steel corrosion since it produces the results close to that of ACE method. However, the GS method generated significantly smaller crack widths due to leakage of corrosion products. A correction factor is needed to modify the crack widths of GS method when predicting deterioration levels of structures. For long-term structural performance assessment, it is important to model spatial steel corrosion in finite element method considering its correlation in longitudinal and transverse directions for desired prediction results. Using statistic data of steel weight loss of corroded beams with 10 micro amperes/cm2 provided conservative estimation of loading capacities.

Free Research Field

Concrete engineering

Academic Significance and Societal Importance of the Research Achievements

X-ray and image processing techniques enable a comprehensive study the time-dependent steel corrosion and crack widths and its associated structural performance. Prediction of the long-term structural performance considering spatial steel corrosion is important for better-informed maintenance plans.

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Published: 2024-01-30  

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