Doctoral Dissertations

Author

Fujian Tang

Keywords and Phrases

Electrochemical Impedance Spectroscopy

Abstract

"This study is aimed (a) to statistically characterize the corrosion-induced deterioration process of reinforced concrete structures (concrete cracking, steel mass loss, and rebar-concrete bond degradation), and (b) to develop and apply three types of enamel-coated steel bars for improved corrosion resistance of the structures. Commercially available pure enamel, mixed enamel with 50% calcium silicate, and double enamel with an inner layer of pure enamel and an outer layer of mixed enamel were considered as various steel coatings. Electrochemical tests were respectively conducted on steel plates, smooth bars embedded in concrete, and deformed bars with/without concrete cover in 3.5 wt.% NaCl or saturated Ca(OH)₂ solution. The effects of enamel microstructure, coating thickness variation, potential damage, mortar protection, and corrosion environment on corrosion resistance of the steel members were investigated. Extensive test results indicated that corrosion-induced concrete cracking can be divided into four stages that gradually become less correlated with corrosion process over time. The coefficient of variation of crack width increases with the increasing level of corrosion. Corrosion changed the cross section area instead of mechanical properties of steel bars. The bond-slip behavior between the corroded bars and concrete depends on the corrosion level and distribution of corrosion pits. Although it can improve the chemical bond with concrete and steel, the mixed enamel coating is the least corrosion resistant. The double enamel coating provides the most consistent corrosion performance and is thus recommended to coat reinforcing steel bars for concrete structures applied in corrosive environments. Corrosion pits in enamel-coated bars are limited around damage locations"--Abstract, page iii.

Advisor(s)

Chen, Genda

Committee Member(s)

Brow, Richard K.
Volz, Jeffery S.
OKeefe, Matt
Sneed, Lesley

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering

Sponsor(s)

National Science Foundation (U.S.)
Missouri. Department of Transportation
Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2013

Pagination

221 pages

Note about bibliography

Includes bibliographical references (pages 201-220).

Rights

© 2013 Fujian Tang, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Steel, Structural -- Corrosion -- Prevention
Reinforced concrete construction
Reinforced concrete -- Service life
Reinforced concrete -- Testing
Scanning electron microscopy

Thesis Number

T 10421

Electronic OCLC #

870654434

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