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ABSTRACT
Repair of concrete requires not only knowledge of the support to be repaired, of repair and materials and of their environmental conditions of use, but also an understanding of the mechanisms underlying adhesion. Dimensional, electrochemical, chemical and permeability compatibilities are the keys to successful, durable repairs. Based on an analysis of the reinforced concrete building stock and possible intervention strategies, emphasis was placed in Part 1 on the effects and causes of the most prevalent surface defects. But besides the requirement for a proper condition assessment, adequate preparation, cleanliness and roughness are essential characteristics for the development of adhesion and the bonding of the repair product, thereby ensuring the durability of the repair.
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Read the articleAUTHORS
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Benoît BISSONNETTE: Professor, PhD, Engineer - Concrete Infrastructure Research Center – Université Laval (Québec, Canada)
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Luc COURARD: Professor, PhD, Civil Construction Engineer - GeMMe – Building materials laboratory – University of Liège (Liège, Belgium)
INTRODUCTION
The repair of reinforced concrete structures, buildings, roads, etc. has become a routine operation. Concrete remains a high-performance, long-lasting material, but the explosion in construction after the Second World War has been such that the number of damaged buildings and infrastructures requiring repair is increasing exponentially.
At the interface between materials science and engineering, repair systems and techniques have to be chosen with a short-term view – to restoring a structure to its original capacity – but also with a longer-term view to ensuring a new lease of life.
The compatibility of repair products with old concrete is a prerequisite for the quality and durability of repairs, which are measured in particular by the long-term adhesion of the new material to the old concrete. How successfully the various compatibility requirements can be met depends on a number of factors:
choice of material ;
substrate preparation ;
installation technique ;
quality control operations.
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KEYWORDS
building | Concrete | degradation | repair | civil engineering
This article is included in
Pathologies and building rehabilitation
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Repairing reinforced concrete structures
Fundamental principles: adhesion and compatibility
Bibliography
Standards and norms
- Products and systems for the protection and repair of concrete structures – Definitions – Requirements – Quality control and evaluation of conformity, CEN, Brussels. - EN 1504-10 - 2003
- Guide for Evaluation of Concrete Structures before Rehabilitation, Committee 364 Rehabilitation, American Concrete Institute, Detroit (MI), USA, 22 p. - ACI 364.1-R07 - 2007
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