Electrochemical Behaviour And Corrosion
Sensitivity Of Prestressed Steel In Cement Grout
Author(s)
E. Blactot, C. Brunet-Vogel, F. Farcas, L. Gaillet, I. Mabille,
T. Chaussadent & E. Sutter
Abstract
The durability of prestressed concrete bridges primarily depends on the steel
wire cables. Several disorders in these bridges are well known, such as fracture
of these cables by stress corrosion cracking due to water penetration in the
prestressing ducts. This water can contain various aggressive constituents with
respect to corrosion (like chlorides). Its penetration inside the duct is due to the
presence of sealing defects of the structure or in the concrete (like cracks).
The second category of defects relates to the cement grout injection, which
protects cables. This occurs due to a degradation of the grout in contact with
water (problems of bleeding and segregation) leading to brittle fractures of steels.
The first step of the study consisted in obtaining a corrosive liquid typical of a
segregated cement paste on which electrochemical tests were done.
Electrochemical tests in synthetic solutions defined from a bibliographical study
and analysis of real cases of segregated cement grout were also realized.
High strength and ordinary steel specimens were used and all the tests were
mainly done in deaerated conditions. The main results can lead one to consider
that, in oxygen free conditions, steel specimens surface can be either in active or
passive state. The susceptibility of steels to stress corrosion cracking was
determined by the means of models applied to potentiodynamic polarisation.
Keywords: prestressed steel, corrosion, segregation, synthetic solution.
1 Introduction
In prestressed concrete structures, cement grout is injected in high-density
polyethylene ducts containing the steel cables with the objective to ensure a
Keywords
prestressed steel, corrosion, segregation, synthetic solution.
Related Book
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