Abstract
This paper reviews research carried out towards the development of a novel conductive coating for reinforced concrete structures in order to enable the application of electrochemical anti-corrosion treatments. The coating is composed of a hardened paste containing graphite powder and cement. The applied techniques were electrochemical chloride extraction (ECE), cathodic protection (CP), and cathodic prevention, as well as combined treatments such as ECE-CP. This research has demonstrated their efficiency when using the new conductive coating as an anode system. The influence of the shape of the structural elements on the performance of the electrochemical treatments was also studied. Several characteristics of the coating have been determined, such as conductivity, durability, adhesion to the concrete surfaces, and ease of application. The results demonstrate the adequacy of using this coating as the anode for anti-corrosion treatments on reinforced concrete structural elements of different shapes, for the purpose of extending service life.
Highlights
The Multifunctional Materials and Durability research teams of the Polytechnic School of the University of Alicante have been working together to develop a research line dedicated to understanding the behavior of graphite–cement pastes as a coating for reinforced concrete structures.This development starts from the certainty that the main enemy of reinforced concrete is steel rebar corrosion, and that the triggers of this corrosion are principally carbonation and chloride ion (Cl )penetration into the concrete mass.It is true that, with today’s technology and the current knowledge about corrosion processes, it is possible to manufacture reinforced concrete resistant to corrosion
The results demonstrate the adequacy of using this coating as the anode for anti-corrosion treatments on reinforced concrete structural elements of different shapes, for the purpose of extending service life
The results provide confirmation regarding the shape effect of the structural elements on the Electrochemical chloride extraction (ECE)
Summary
The Multifunctional Materials and Durability research teams of the Polytechnic School of the University of Alicante have been working together to develop a research line dedicated to understanding the behavior of graphite–cement pastes as a coating for reinforced concrete structures.This development starts from the certainty that the main enemy of reinforced concrete is steel rebar corrosion, and that the triggers of this corrosion are principally carbonation and chloride ion (Cl )penetration into the concrete mass.It is true that, with today’s technology and the current knowledge about corrosion processes, it is possible to manufacture reinforced concrete resistant to corrosion. The Multifunctional Materials and Durability research teams of the Polytechnic School of the University of Alicante have been working together to develop a research line dedicated to understanding the behavior of graphite–cement pastes as a coating for reinforced concrete structures. This development starts from the certainty that the main enemy of reinforced concrete is steel rebar corrosion, and that the triggers of this corrosion are principally carbonation and chloride ion (Cl ). It is common to find construction works of high economic and strategic value, and it is necessary to extend their service life as long as possible To achieve this goal, it is desirable to develop new methods allowing an effective preservation of these infrastructures from the reinforcement corrosion processes. All these techniques are Coatings 2016, 6, 32; doi:10.3390/coatings6030032 www.mdpi.com/journal/coatings
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