Study of the chloride diffusion in mortar: A new method of determining diffusion coefficients based on impedance measurements

Díaz, Belén; Nóvoa, X.R.; Pérez, M.C.

doi:10.1016/j.cemconcomp.2006.01.009

Cited by 80 publications

(51 citation statements)

References 8 publications

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“…The diffusion flux of ion specie in porous media is expressed by the Nernst-Planck equation (Andrade 1993;Díaz et al 2006;Mercado et al 2012;Minagawa et al 2010).…”

Section: Diffusion and Electrical Conductivitymentioning

confidence: 99%

“…McCarter et al (2000) reported that the electrical conductivity and permeability and the diffusion coefficient of mortar showed a good correlation, which shows the relationship between the electrical conductivity and other properties of cement-based materials. In addition, there have been many studies investigating the correlation between the electrical conductivity and other properties of concrete (Andrade 1993;Streicher and Alexander 1995;Sánchez et al 2011;Ortega et al 2012;Shi et al 1999;Díaz et al 2006;Mercado et al 2012;Buenfeld and Newman 1987;Shane et al 2000;Vedalakshmi et al 2008;Neithalath and Jain 2010;Minagawa et al 2010). However, most studies have investigated limited ranges of water to cement ratios (W/C 0.4-0.6), and the relationship between the porosity and conductivity of mortar or concrete, which includes the effect of the interfacial transition zone (ITZ), was established as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Kurumisawa

Nawa

2016

ACT

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The transport properties of hardened cement paste (HCP) have been investigated in many studies; the AC impedance method (ACI) is a non-destructive technique employed for this purpose and has been used in investigations of the electrical characteristic and mass transport properties of HCP. However, there are relatively fewer studies investigating chloride ingress in HCP and using the ACI. In this study, the relationship between the electrical conductivity measured by the ACI and chloride ingress was investigated. Backscattered electron image analysis and mercury intrusion porosimetry and water porosity were used to measure the pore structure of HCP, and the chloride ingress depth was measured by an electron probe microanalyzer. There was a high correlation between the porosity and conductivity and between the conductivity and diffusion coefficient of the chloride ions in HCP. This implies that the diffusion coefficient of chloride ions could be estimated by the conductivity measurements.

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“…The diffusion flux of ion specie in porous media is expressed by the Nernst-Planck equation (Andrade 1993;Díaz et al 2006;Mercado et al 2012;Minagawa et al 2010).…”

Section: Diffusion and Electrical Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Kurumisawa

Nawa

2016

ACT

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“…The impedance of the cell was measured periodically between 40 MHz and 10 Hz to assess the evolution of the resistivity of the membrane, through which the diffusion coefficient can be derived [8]. The impedance measurements were performed using an Agilent 4294A…”

Section: Setup For Macroscopic Permeation Experimentsmentioning

confidence: 99%

“…Investigations based on electrochemical impedance spectroscopy, EIS, [8,9] have already evidenced the presence of several concurrent ionic-conduction phenomena in cementitious materials, which involve percolating conduction and ionic exchange between the pore's solution and pore's walls. As each phenomenon occurs at a specific frequency, it is possible to tune the frequency of the electrical signal to act on the conduction paths, thus increasing the current efficiency on the ionic transport and diminishing the structural damage [10].…”

Section: Introductionmentioning

confidence: 99%

Macro and micro aspects of the transport of chlorides in cementitious membranes

Díaz

Nóvoa

Puga

et al. 2014

Electrochimica Acta

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A study of the transport of chlorides through hardened Portland cement paste membranes is reported. The flux of chlorides was induced by migration (AC and DC fields) and diffusion.Two parallel studies were developed. A macroscopic one where the migration of chlorides was followed by Electrochemical Impedance Spectroscopy (EIS) and a microscopic one in which the natural diffusion was investigated using the scanning electrochemical microscopy (SECM). Both studies have revealed to be complementary. The local investigations performed with the SECM were successfully employed for the interpretation of the EIS data.The results have shown that the transport of chlorides occurs mainly through pores of submicrometre equivalent diameter. The study of the transition time has allowed to conclude that the diffusion coefficient approaches the usual value obtained in bulk solution. The macroscopic study has allowed presenting an explanation for the beneficial effect of the AC current in the transport of chlorides. A possible method for estimating the flux of chlorides from the percolation resistance is also discussed.

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“…Most techniques rely still today on saturated samples [1,[4][5][6][7][8][9][10][11]. Yet, in-situ structures are hardly encountered in saturated state.…”

Section: Introductionmentioning

confidence: 99%

Impact of the pore solution on the aqueous diffusion through porous materials

Mercado-Mendoza

Lorente

2015

Open Engineering

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This paper reviews the main advances of our group on the measurements of the di usion coe cient through partially saturated porous materials. The technique that we developed is based on the de nition of an equivalent electrical model reproducing the behavior of the porous microstructure. The electrical characteristics are measured by means of Electrochemical Impedance Spectroscopy. After validating the approach on saturated samples, the method was applied to partially saturated materials. We showed that the pore solution ionic composition has not impact on the results, and documented the e ect of the pore size distribution on the macroscopic diffusion coe cient.

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Study of the chloride diffusion in mortar: A new method of determining diffusion coefficients based on impedance measurements

Cited by 80 publications

References 8 publications

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Macro and micro aspects of the transport of chlorides in cementitious membranes

Impact of the pore solution on the aqueous diffusion through porous materials

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