Modelling of Corrosion Protection for Reinforced Concrete Structures With Surface Coatings/Gelžbetoninių Konstrukcijų Su Paviršinėmis Dangomis Korozinės Apsaugos Modeliavimas

Abstract

Abstract. Corrosion is a serious problem for the durability of reinforced concrete structures. These structures need to be protected from corrosion in a variety of exposure conditions ranging from atmospheric to continuous immersion in water or chemicals. One of the ways to protect reinforced concrete structures from corrosion is to use protective coatings. The surface barriers of non-degradable materials are able to slow down considerably the rate of deterioration of concrete structures and to overcome most durability problems associated with external attack. Design of durability of concrete structures with protective coatings needs to be established. In this paper a general framework for service life prediction and reliability evaluation of anticorrosion protective system (CPS), which is represented by protective surface barrier, concrete cover, and steel reinforcement itself of reinforced concrete structures, is presented. This approach is based on a reasonable understanding of the main degradation processes of all components ensuring protection ability and durability of concrete structures. The effect of repair of CPS components on extending the service life of a whole protective system is considered. Numerical example for reliability verification of CPS is also given.

Modelling of Corrosion Protection as Standby System for Coated Reinforced Concrete Structures

“…In this situation the system behaviour can be represented by Markov model which is probably the most used to simulate the different stochastic processes of complex systems. Although it is possible to predict deterioration of CPS with other forms of models, including also deterministic models (Kamaitis 2008), the Markovian model is particularly suitable for condition state assessments based on inspection cycles. It requires only limited inspection data before model estimation becomes possible.…”

“…In the author's paper (Kamaitis 2008) the concept of corrosive protection system (CPS) of reinforced concrete members taking into account the performance of protective surface barrier, concrete cover and steel reinforcement itself was proposed. Degradation of CPS as multicomponent protection system begins, in general, from the top layer.…”

Chloride Penetration Resistance of Concrete Sealer and Coating Systems

“…Moreover, Kamaitis (2007b) recommended the use of polymer protective coatings onto concrete surfaces where special protection against aggressive attack is necessary and demonstrated that polymer coatings can protect concrete from a variety of aggressive chemicals; his proposed models can be efficiently applied to assess the service life and performance of polymer protective coatings under different chemical exposure conditions. Kamaitis (2008) also took into account protective surface coating, concrete cover, and steel reinforcement in a whole to study the corrosion protection and service life of reinforced concrete structures. Recently, Yoon (2012) studied the effect of coating on chloride penetration through cracks in high-strength concrete with and without steel fibres; he concluded that coating can substantially reduce the chloride penetration into concrete.…”

Modelling the Carbonated Concrete Realkalization

“…The influence of the atmosphere on reinforced concrete structures causes the carbonation of concrete (Kamaitis 2008). As a result of this process, a reduction in the concrete cover protective properties occurs, along with an increased corrosion hazard for the reinforcement.…”