Abstract
The mechanisms of reinforcement corrosion in concrete are the subject of extensive research. Although reliable methods for predicting the corrosive deterioration of concrete structures do not yet exist. This paper describes the durability problem of reinforced concrete bridges based on the mechanisms of carbonation depth or chloride profile. The deterioration model considering concrete carbonation, chloride penetration and concrete cover cracking is adopted to describe the service life of concrete structures. The corrosion models include environmental conditions, concrete carbonation or chloride diffusion rates, quality of concrete cover, steel corrosion rates and many other factors that make the predicting of service life of structures extremely difficult. Finally, the author gives the details of the methods of durabilio/ verification and the proposals for its including in the national standards and practical guides.
Highlights
Deterioration of reinforced concrete due to corrosion of steel is a worldwide problem
Reinforcement corrosion in concrete usually results in concrete cover cracking or spalling
This paper describes the durability problem of reinforced concrete bridges based on the mechanisms of carbonation depth or chloride profile
Summary
Deterioration of reinforced concrete due to corrosion of steel is a worldwide problem. Reliable methods for predicting the corrosive deterioration do not yet exist. In such case there is a need to provide a good design of durability. The corrosion of reinforcement leads to: 0 the destruction of steel-concrete bonding mechanism; 0 the reduction in the reinforcement cross-section; 0 the increase of displacements (deformations, widening of cracks); 0 the loss of ductility of members and as a result the carrying capacity or serviceability of the structures. Reinforcement corrosion in concrete usually results in concrete cover cracking or spalling. This paper describes the durability problem of reinforced concrete bridges based on the mechanisms of carbonation depth or chloride profile. The deterioration model considering concrete carbonation, chloride penetration and concrete cover cracking is adopted to describe the service life of concrete structures
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