A Contribution To The Rehabilitation Of
Reinforced Concrete Structures By
Non-destructive Electrochemical Methods
Author(s)
J. L. Rovira Santa Olaya & P. Pardo Tràfach
Abstract
The aim of this work has been the study of an electrochemical treatment that
allows the prevention and halting of chloride corrosion processes in passive
reinforced concrete. This treatment is based on a desalination system that
removes free chloride in concrete simultaneously increasing the pH around
reinforcement steel until its repassivation.
With this purpose a concrete has been manufactured with mixing proportions
close to that used in civil engineering. The chloride attack has been carried out at
room temperature, and the chloride removal process has been started at several
concrete ages. Chloride ions have been determined before and after the attack, as
well as the corrosion potential, in order to establish comparison between the
grade of corrosion of the reinforcement steel before and after treatment,
according to exposition time and initial corrosion situation. Relationships
between electrochemical parameters have been determined.
The studied procedure is a non-destructive and non-intrusive method that
does not change either the strength of the concrete or its external appearance.
The procedure uses non-pollutant materials, so no environmental damage is
caused.
Keywords: electrochemical chloride extraction, steel-reinforced concrete,
repassivation.
1 Introduction
Corrosion in steel reinforcement caused by exposition to chlorides is the main
cause of deterioration in steel-reinforced concrete structures. Electrochemichal
Keywords
electrochemical chloride extraction, steel-reinforced concrete,
repassivation.
Related Book
Other papers in this volume
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