Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode

Pérez, Alicia; Climent, M.Á.; Garcés, P.

doi:10.1016/j.corsci.2010.01.016

Cited by 77 publications

(55 citation statements)

References 13 publications

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“…A graphite-cement paste anode system was successfully used to provide combined treatment without damaging the anode (Carmona et al, 2015). Similarly, Pérez et al (2010) showed that there was not sufficient damage to lead to a malfunction of their anodic system when using the combined treatment.…”

Section: Electrochemical Extraction With Subsequent Cpmentioning

confidence: 99%

State-of-the-art review of cathodic protection for reinforced concrete structures

Byrne¹,

Holmes²,

Norton³

2016

Magazine of Concrete Research

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Cathodic protection (CP) limits the corrosion of a metal surface by making it the cathode of an electrochemical cell.This can be achieved either by using a more active sacrificial anode to create a driving current, or by using inert anodes and impressing a current onto the cathode surface using an external direct current (DC) source. Impressed current cathodic protection (ICCP) is preferred where widespread protection is required, particularly in reinforced concrete structures. ICCP needs a constant DC power supply that is usually provided through a grid connection or independent generators. This paper presents the currently available CP systems for reinforced concrete, particularly ICCP, and the possibility of using self-sufficient and renewable energy systems. The potential for overcoming the mismatch (due to intermittent current) in energy provision from renewable sources with energy needs for CP (constant current) is discussed by exploring methods of storing energy and examining the level of protection provided by intermittent current. Areas that require further research to optimise the design of such systems are highlighted.

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Section: Electrochemical Extraction With Subsequent Cpmentioning

confidence: 99%

State-of-the-art review of cathodic protection for reinforced concrete structures

Byrne¹,

Holmes²,

Norton³

2016

Magazine of Concrete Research

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“…The high water-to-solid ratio (w/s = 0.8) is necessary for meeting the fluidity requirements of the spraying application system. The dosage and thickness of the GCP anodic overlay were adopted as a consequence of the good performances shown by this anode system in recent research by the same authors [21,22]. The problem of keeping the anodic systems moist (both the Ti-RuO 2 mesh embedded into layers of absorbent fabric, and the GCP overlay) during the ECE treatments was overcome by using a system that consisted of a water pump and several pipes with droppers, assembled around the surface of each specimen.…”

Section: Experimental Details Of the Ece Testsmentioning

confidence: 99%

“…Finally, the combined treatments (ECE+CP and ECE+CPrev) are tested here to represent situations in which a structure is exposed to an aggressive Cl´environment, and an analytical determination of concrete's Cl´content reveals an excessive value from the point of view of reinforcement corrosion. In these conditions the ECE technique is first applied to reduce the Cl´content, and afterwards a continuous protective treatment (CP or CPrev) is applied to preserve the steel reinforcement in protective conditions [21,27]. It must be stressed that all specimens included in Table 3, even those that were not given any of the electrochemical treatments (R and P), were subjected to the same salting regime during the 24-week period of the CP or CPrev treatments: 65 mL NaCl 0.5 M was sprayed weekly onto the concrete or anodic overlay surface, in order to simulate the continued chloride contamination due to exposure to a very aggressive environment, as mentioned above.…”

Section: Materials and Methods Used In Case Studymentioning

confidence: 99%

Graphite–Cement Paste: A New Coating of Reinforced Concrete Structural Elements for the Application of Electrochemical Anti-Corrosion Treatments

2016

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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.

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“…To set up the anode system, a graphite-cement paste (GC) was prepared by mixing graphite powder and Portland cement at 50%-50% in mass, with a water to solid mix ratio of 0.8. On that subject, the criteria stated in previous researches based on this kind of anodic system [17][18][19][20] was followed. A layer 2 mm thick of this paste was applied on the top face of each specimen, and after that all of them were placed in the curing chamber for 10 days.…”

Section: Laboratory Specimensmentioning

confidence: 99%

“…Also, assemblies composed by metal-carbon cementitious material mixes are recently proposed as anodes for CP [14][15][16]. For the present research, the anode system was basically composed of a thin layer of graphite-cement paste (GC), as was carried out initially for electrochemical chloride extraction [17][18][19], and recently adapted to cathodic protection. [20].…”

Section: Introductionmentioning

confidence: 99%

Influence of different ways of chloride contamination on the efficiency of cathodic protection applied on structural reinforced concrete elements

Calero

Climent

Terradillos

2017

Journal of Electroanalytical Chemistry

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Cathodic protection is a method to protect reinforced concrete structures located in saline environments against corrosion effect produced by Cl -penetration. But there are significant differences among these aggressive environments. The aim of this article is to show how different ways of saline contamination can affect the efficiency of cathodic protection. For this research, a series of laboratory specimens representing structural elements were subjected to two versions of cathodic protection (cathodic protection strictly speaking, and cathodic prevention), while two different ways of saline contamination were applied (permanent immersion in a NaCl solution and periodic pouring of discrete amounts of a NaCl solution in atmospheric exposure). Depending on the saline environment, differences in the efficiency of cathodic protection were detected. Results can be useful to determine the specific features of the cathodic protection to be applied in each case, taking into account both the initial Clcontent of the structural element and the particular saline environment where it is located.

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Electrochemical extraction of chlorides from reinforced concrete using a conductive cement paste as the anode

Cited by 77 publications

References 13 publications

State-of-the-art review of cathodic protection for reinforced concrete structures

State-of-the-art review of cathodic protection for reinforced concrete structures

Graphite–Cement Paste: A New Coating of Reinforced Concrete Structural Elements for the Application of Electrochemical Anti-Corrosion Treatments

Influence of different ways of chloride contamination on the efficiency of cathodic protection applied on structural reinforced concrete elements

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