Factors influencing electrochemical removal of chloride from concrete

Arya, Chanakya; Sa'id-Shawqi, Q; Vassie, P R

doi:10.1016/0008-8846(96)00067-1

Cited by 57 publications

(24 citation statements)

References 2 publications

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“…As reported by Arya et al [4], chloride removal increases with increasing applied potential, number of reinforcing bars at a particular depth and initial chloride content, although chloride remaining seems to be independent of the initial chloride content. This method requires the chloride ions to be in the pore water to be transported out of the concrete [2].…”

Section: Introductionsupporting

confidence: 64%

A contribution to the rehabilitation of reinforced concrete structures by non-destructive electrochemical methods

Olaya¹,

Tràfach²

2006

WIT Transactions on the Built Environment, Vol 85

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The aim of this work has been the study of an electrochemical treatment that allows the prevention and halting of chloride corrosion processes in passive reinforced concrete. This treatment is based on a desalination system that removes free chloride in concrete simultaneously increasing the pH around reinforcement steel until its repassivation.With this purpose a concrete has been manufactured with mixing proportions close to that used in civil engineering. The chloride attack has been carried out at room temperature, and the chloride removal process has been started at several concrete ages. Chloride ions have been determined before and after the attack, as well as the corrosion potential, in order to establish comparison between the grade of corrosion of the reinforcement steel before and after treatment, according to exposition time and initial corrosion situation. Relationships between electrochemical parameters have been determined.The studied procedure is a non-destructive and non-intrusive method that does not change either the strength of the concrete or its external appearance. The procedure uses non-pollutant materials, so no environmental damage is caused.

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Section: Introductionsupporting

confidence: 64%

A contribution to the rehabilitation of reinforced concrete structures by non-destructive electrochemical methods

Olaya¹,

Tràfach²

2006

WIT Transactions on the Built Environment, Vol 85

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“…The results of research described in [15] proved a significant rise in the mass of chloride ions removed from the concrete every time the voltage was increased. Ihekwaba and Hope [18] conducted research on the effect of current density on the intensity of chloride extraction.…”

Section: The Effect Of the Electric Current On The Extraction Intensitymentioning

confidence: 99%

“…For the assessment of the effect of the voltage applied on the extraction process Arya et al [15] tested cuboid specimens of the size 200x200x120 mm. Each specimen contained a mild steel bar of the diameter of 10 mm.…”

Section: The Effect Of the Electric Current On The Extraction Intensitymentioning

confidence: 99%

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Essential Factors For The Changes In Concrete During Electrochemical Extraction

Alsabry

2017

International Journal of Applied Mechanics and Engineering

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The objective of the article is to present one of the most significant factors affecting electrochemical removal of chloride ions from concrete. Based on the literature findings, tests were carried out on specimens containing chloride admixtures introduced to the cement grout, on elements subjected to chloride penetration from the solution in laboratory conditions and on fragments of constructions penetrated by chlorides as a result of a long-term exposure to seawater.

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“…The degree of chloride decrease was determined on the basis of their initial content in the tested concrete and the direct current density (Arya et al 1996;Polder et al 1994;. The influence of external electrolyte type on the effectiveness of extraction and on changes in pore solution components have been established (Polder et al 1995).…”

mentioning

confidence: 99%

Application of thermomechanics equations in describing chloride extraction from concrete

Ali

Zybura

2007

Transp Porous Med

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During the extraction of chlorides from concrete there occur processes involving transfer of mass and electric charge via pore solution components. On the basis of the relations which exist between the concentrations of these components, the electric field intensity, the temperature, and the mechanical stress, thermomechanics equations of a multicomponent medium have been used for analytical description. On the basis of equations for the balance of mass, electric charge, momentum, energy and entropy inequality, equations of ion flows have been determined, which are justified in the general effect of the electric field action on the concrete covering. The occurrence of processes which are recognised as dominant ones during the chloride extraction has allowed us to significantly simplify the equations and reduce them to formulas permitting a practical use. By approximating the electrochemical potentials of the leading ions via the linear function of concentration and electric field potential, a flow equation has been determined which has a shape similar to the classical diffusion equation. In order to define the electrodiffusion coefficient occurring in this equation an inverse problem has been formulated and then numerical values of this coefficient have been evaluated using the results of experimental tests.

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Factors influencing electrochemical removal of chloride from concrete

Cited by 57 publications

References 2 publications

A contribution to the rehabilitation of reinforced concrete structures by non-destructive electrochemical methods

A contribution to the rehabilitation of reinforced concrete structures by non-destructive electrochemical methods

Essential Factors For The Changes In Concrete During Electrochemical Extraction

Application of thermomechanics equations in describing chloride extraction from concrete

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