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Residual capacity of corroded reinforcing bars

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posted on 2023-05-18, 13:12 authored by Du, YG, Clark, LA, Andrew ChanAndrew Chan
This paper presents an experimental investigation into the residual capacity of corroded reinforcing bars. By performing both accelerated and simulated corrosion tests on bare bars and on bars embedded in concrete, the mechanism of the reduction of the capacity of corroded reinforcement was investigated. The influence of type and diameter of reinforcement on its residual capacity is discussed. The experimental results show that, due to local attack penetration, the residual cross-section of a corroded bar is no longer round and varies considerably along its circumference and its length. Although the force–extension curves of corroded bars are similar to those of noncorroded bars for up to 16% corrosion, their residual yield and ultimate forces decrease more rapidly than their average cross-sectional area and, therefore, their residual strength decreases significantly. Even though the residual capacity of corroded small diameter and/or plain bars reduces more than that of large diameter or ribbed ones, differences are not significant and can be neglected. Finally, a simple equation is proposed to predict the residual capacity of corroded reinforcing bars in practice.

History

Publication title

Magazine of Concrete Research

Volume

57

Pagination

135-147

ISSN

0024-9831

Department/School

School of Engineering

Publisher

Thomas Telford Services Ltd

Place of publication

Thomas Telford House, 1 Heron Quay, London, England, E14 4Jd

Rights statement

Copyright 2005 Thomas Telford Ltd.

Repository Status

  • Open

Socio-economic Objectives

Metals

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