Corrosion-Induced Concrete Cracking, Steel-Concrete Bond Loss, and Mechanical Degradation of Steel Bars

Abstract

This study experimentally investigated corrosion-induced deterioration in reinforced concrete (RC) structures: concrete cover cracking, steel-concrete bond loss, and mechanical degradation of corroded steel bars. Pullout and RC beam specimens were prepared, subjected to accelerated corrosion in a wet sand bath, and tested under loading. A 3D laser scan was employed to measure the surface profile of corroded steel bars and determine the corrosion effect on the distribution of residual cross section area. The crack width on the concrete surface was sampled randomly and analyzed statistically. Corrosion reduced the bond strength between steel bars and concrete, particularly in the form of corrosion-induced number and width of cracks. Both the yield and ultimate strengths depended upon the critical cross sectional area of steel bars, whereas the elongation changed with the cross section distribution over the length of the steel bars. Corrosion also changed the distribution of the cross sectional area of steel bars. The crack width on the concrete surface can be well represented by a normal distribution regardless of corrosion levels.

Meeting Name

4th International Conference on Structures and Building Materials (2014: Mar. 15-16, Guangzhou, China)

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

INSPIRE - University Transportation Center

Keywords and Phrases

Corrosion; Cracking; Pullout Bond; Chlorine Compounds; Concrete Beams And Girders; Crack Initiation; Normal Distribution; Reinforced Concrete; Accelerated Corrosion; Corroded Steel Bars; Corrosion-Induced Deterioration; Cross Section Distributions; Cross Sectional Area; Mechanical Degradation; Residual Cross-Section; Bars (Metal)

International Standard Book Number (ISBN)

978-3038350859

International Standard Serial Number (ISSN)

1022-6680

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2014 Trans Tech Publications, All rights reserved.

Publication Date

01 Mar 2014

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