Masters Theses

Author

Dayi Zhang

Abstract

"This study involved the spalling problem found in some partial-depth precast prestressed bridge decks in the state of Missouri. Recently, panels of several bridges have exhibited corrosion of the prestressing steel tendons causing concrete spalling at the edges of panels. Some of the exposed tendons are corroded to the point of rupture. The effect of factors, namely concrete side edge distance and concrete material type, on steel corrosion in chloride-contaminated reinforced concrete was investigated in this study. Wet-dry cycle tests and accelerated corrosion tests were carried out on sixty-three specimens designed with three different side edge distances and three different concrete mixture types. Visual inspection and gravimetric study were performed on all test specimens. For specimens subjected to wet-dry cycle test, corrosion potential measurement, electrical resistivity measurement, and chloride content analysis were also conducted. For specimens subjected to accelerated corrosion test, time from corrosion initiation to corrosion cracking was used to verify the effectiveness of various models in predicting cracking time with low impressed current. Findings indicate that, for specimens of constant thickness, concrete deterioration and tendon corrosion decreased as the side edge distance increased. In addition, experimental results showed little difference in deterioration levels between specimens of concrete with fibers and the control specimens with normal concrete. Higher levels of deterioration were found in specimens with corrosion inhibitor compared to the control specimens with normal concrete"--Abstract, page iii.

Advisor(s)

Sneed, Lesley

Committee Member(s)

LaBoube, Roger A.
Volz, Jeffery S.

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Sponsor(s)

Missouri. Department of Transportation

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2012

Pagination

xv, 107 pages

Note about bibliography

Includes bibliographical references (leaves 139-143).

Geographic Coverage

Missouri

Rights

© 2012 Dayi Zhang, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Concrete bridges -- Floors -- Corrosion -- Missouri
Tendons (Prestressed concrete) -- Corrosion

Thesis Number

T 9949

Print OCLC #

794689666

Electronic OCLC #

752530189

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