Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Kurumisawa, Kiyofumi; Nawa, Toyoharu

doi:10.3151/jact.14.87

Cited by 21 publications

(9 citation statements)

References 36 publications

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“…using impedance measurements (Kurumisawa and Nawa 2016) or similar to our work -deriving resistivity based on recorded resistance values (McCarter et al 2001). The electrical resistivity of mortar in this work was measured using the "2-pin method" where the "pins" were initially cast-in brass plates with dimensions equal to the sides of the mortar cubes (i.e.…”

Section: Mortar Electrical Resistivitymentioning

confidence: 99%

The Effect of Water-to-Cement Ratio and Curing on Material Properties of Mortar Specimens in Stray Current Conditions

Susanto

Koleva

Breugel

2017

ACT

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This work reports on the synergetic effect of water-to-cement ratio, curing conditions, varying external environment and stray current on the microstructural (porosity and pore size), electrical (resistivity) and mechanical (compressive strength) properties of 28 days-cured cement-based materials. The influence of curing on porosity and pore size, in stray current conditions, was assessed by correlating the performance of 28 days cured mortar with that of fresh (24h-cured only) mortar specimens in identical environmental medium. Three different levels of electrical current density (i.e. 10mA/m 2 , 100 mA/m 2 and 1 A/m 2 ) were applied to simulate stray current flow through hardened mortar specimens with water-to-cement ratio of 0.5 and 0.35. Different environmental conditions were employed i.e. sealed conditions, partly immersed, and fully submerged in water and calcium hydroxide medium. Microstructural, mechanical and electrical properties were monitored in the course of 140 days. The outcomes suggest a potentially positive effect of the stray current, where water and/or humidity exchange with the external environment is restricted. The potential for this positive effect was experimentally supported through the recorded matrix densification and increased compressive strength of mortar specimens, subjected to stray current and treated in calcium hydroxide and/or sealed conditions, compared to equally handled and treated control cases. In contrast, for water submerged mortar specimens, subjected to stray current, coarsening of the bulk matrix and reduced compressive strength were observed. The outcomes were irrespective of w/c ratio and curing conditions. The effect of stray current was found to be predominantly determined by the current density level and increased at values > 100mA/m 2 . This would result in compromised mechanical properties and potentially reduced performance of cementbased materials within service life. Therefore, concrete curing and conditioning on site need to include considerations for the potential effect of stray currents.

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Section: Mortar Electrical Resistivitymentioning

confidence: 99%

The Effect of Water-to-Cement Ratio and Curing on Material Properties of Mortar Specimens in Stray Current Conditions

Susanto

Koleva

Breugel

2017

ACT

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“…The electrical conductivity and microstructure of cement paste over a range of water to cement ratios was investigated in the study [8]. It was shown that it is possible to predict the chloride ingress by measurements of the electrical conductivity.…”

Section: Methodology Selection Justificationmentioning

confidence: 99%

Non-destructive control method of the state of objects operating long time

et al. 2018

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The development of a diagnostic system is a complex engineering problem aimed at preventing damage caused by deteriorating properties of the materials and structures. This article presents the method of nondestructive testing of change control of concrete structures. The analysis of literature data shows that the overwhelming majority of studies are devoted to the change in electrical resistance of concrete in the collection of its strength, and practically no analogous studies regarding its aging are presented. Theoretical substantiation of the change in electrical concrete characteristics (conductivity, resistance) is given with a change in its strength. A work over-bridge in operation more than 30 years has been surveyed. The experimental part consisted in measuring the electrical potentials on the bridge structures, as well as in determining the strength of the material at the same points. Correlation dependence between the measured electric potential value and the strength of the samples taken from the bridge structures were obtained.

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“…However, as Diamond [11] noted, the 39 pore size distribution obtained by MIP is not a true pore size distribution because of ink-bottle effects; 40 the validity of using a total porosity with certain maximum and minimum pore sizes is unclear. 41 Hamami et al [12] used the main pore diameter D c , defined as the mean value of the normal 42 distribution fitted on the main peak of a pore size distribution, as an indicator of the pore structure and 43…”

Section: Introduction 27mentioning

confidence: 99%

“…4. The porosity measured by 208 MIP is lower than that measured by the weight difference between water-saturated and oven-dried 209 samples [40][41][42]. The determination coefficient of the air permeability coefficient and total pore 210 volume is very low at 0.07.…”

Section: Introduction 27mentioning

confidence: 99%

Correlations between Air Permeability Coefficients and Pore Structure Indicators of Cementitious Materials

Sakai¹

2018

Preprint

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Correlations between the air permeability coefficient and various pore structure indicators in cementitious materials were examined to determine the pore structure indicator that best evaluated air permeability using data from previous studies of air permeabilities and pore structures. The determination coefficients of air permeability with total pore volume, critical pore diameter, and ordinary threshold pore diameter were low, although these have often been used as indicators. The median and threshold pore diameters obtained by percolation theory showed high determination coefficients. The equation using the threshold pore diameter better estimated the air permeability coefficient than the Katz–Thompson equation.

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Electrical Conductivity and Chloride Ingress in Hardened Cement Paste

Cited by 21 publications

References 36 publications

The Effect of Water-to-Cement Ratio and Curing on Material Properties of Mortar Specimens in Stray Current Conditions

The Effect of Water-to-Cement Ratio and Curing on Material Properties of Mortar Specimens in Stray Current Conditions

Non-destructive control method of the state of objects operating long time

Correlations between Air Permeability Coefficients and Pore Structure Indicators of Cementitious Materials

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