Corrosion rate and bond performance of steel reinforcement in FRP-wrapped concrete subjected to dry and wet cycling

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Corrosion rate and bond performance of steel reinforcement in FRP-wrapped concrete subjected to dry and wet cycling

 

Author: Yang, Minjie
Title: Corrosion rate and bond performance of steel reinforcement in FRP-wrapped concrete subjected to dry and wet cycling
Degree: M.Sc.
Year: 2012
Subject: Reinforcing bars -- Corrosion.
Steel -- Corrosion.
Reinforced concrete -- Corrosion.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: 65 leaves, [96] p. : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2554565
URI: http://theses.lib.polyu.edu.hk/handle/200/6860
Abstract: Corrosion of reinforcing steel in reinforced concrete is a significant problem throughout the world. It is estimated that more than a hundred billion dollars is needed for the rehabilitation of existing transportation related structures. More than half of these structures are made of reinforced concrete, and their main deficiencies are associated with reinforcement corrosion. The corrosion rate and bond performance of reinforcement in FRP-confined concrete under simulated marine environment were studied. A 0.60 water to cement ratio concrete was used and 5% NaCl solution were used to simulate the tidal cycle. There were two tests in the study. One is electrochemical method for monitoring corrosion rate; the other is pull-out test. In order to accurately monitor rebar corrosion in concrete, 12 embedded sensors are desirable for not only prevent concrete cover effect on monitoring measurement but for continuous long-term monitor. Using them three kinds of electrochemical characteristics can be measures: natural potential, polarization resistance and electrochemical resistance. There were 63 specimens for pull-out test. Test variables included the degree of corrosion (0%, 1%, 3%, 5% and 10% mass loss), wrapped or unwrapped FRP, confinement by GFRP or CFRP and FRP wrapped layers. This paper was to evaluate the effectiveness of the FRP in slowing down the corrosion rate in specimens and examine the ability of FRP to maintain the bond strength of reinforcing bars undergoing natural corrosion and to determine the bond-slip response of corroded steel reinforcement in concrete wrapped with FRP.

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