Ionic aqueous diffusion through unsaturated cementitious materials – A comparative study

Mercado-Mendoza, Hugo; Lorente, Sylvie; Bourbon, Xavier

doi:10.1016/j.conbuildmat.2013.10.026

Cited by 25 publications

(12 citation statements)

References 16 publications

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“…For unsaturated cementitious materials explicit descriptions on the pore structure-dependent ionic transport can hardly be found [14]. Most of the previous studies intended to measure or evaluate the chloride/moisture transport properties in unsaturated cementitious materials [15][16][17][18][19][20][21][22][23][24][25][26][27][28], only that Olsson et al [18] presented a preliminary description on the relationship between large pores, small pores and unsaturated ionic transport. In the literature the unsaturated state is characterized normally by the degree of water saturation (Sw) or relative humidity (RH).…”

Section: Introductionmentioning

confidence: 99%

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Dependence of unsaturated chloride diffusion on the pore structure in cementitious materials

Zhang

Yang

2020

Cement and Concrete Research

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Section: Introductionmentioning

confidence: 99%

“…Buchwald [24] reported that the Drc was decreased from 1 to 0.42 when the Sw decreased from 100 to 70%, while Mercado et al [25] found a drastic drop of Drc from 1 to 0.03 in this saturation range. The role of w/b ratio in unsaturated chloride diffusion remains a point of controversy.…”

Section: Introductionmentioning

confidence: 99%

Dependence of unsaturated chloride diffusion on the pore structure in cementitious materials

Zhang

Yang

2020

Cement and Concrete Research

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“…It is worthwhile to note that imposing the different chloride sources into unsaturated concretes may lead to unwanted moisture redistribution and/or microstructural alteration in the concretes. The conductivity technique, combined with the Nernst-Einstein equation, is an alternative approach to determine the chloride diffusion coefficient in the non-saturated cementitious materials [11][12][13][14][15][16]. Compared to direct diffusion tests, conductivity measurements are fast and easy to perform.…”

Section: Introductionmentioning

confidence: 99%

Influence of moisture condition on chloride diffusion in partially saturated ordinary Portland cement mortar

Zhang

2018

Mater Struct

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Experiments have been carried out to study the influence of moisture condition, including moisture content and its distribution, on the chloride diffusion in partially saturated ordinary Portland cement mortar. The mortar samples with water-tocement (w/c) ratios of 0.4, 0.5 and 0.6, cured for 1 year, were preconditioned to uniform water saturations ranging from 18 to 100%. The interior relative humidities of these partially saturated cement mortars, i.e. water vapour desorption isotherm (WVDI), were measured. The WVDI results in relation to the pore structures obtained from the mercury intrusion porosimetry tests of paste samples with the same w/ c ratios were analyzed, which provided a basic insight into the moisture distribution in the non-saturated cement mortars. The relative chloride diffusion coefficients of cement mortars at various water saturations were determined based on the Nernst-Einstein equation and conductivity technique. It is found that the relative chloride diffusion coefficient D rc depends on the degree of water saturation S w and WVDI. At a given S w level, the D rc is larger for a higher w/c ratio. The role of the w/c ratio in the D rc -S w relation, however, becomes less pronounced with increasing w/ c ratio. There exists a critical saturation, below which the water-filled capillary pores are discontinuous and the D rc -value tends towards infinitely small. An increase of the w/c ratio results in a decrease of the critical saturation level.

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“…These D rc -S w data were obtained based on the Nernst-Einstein equation and conductivity measurements. Since the information of the pore size distribution of the specimens is not available in these studies [13,17,41,42], the porosities of the specimens are given instead.…”

Section: Relative Chloride Diffusion Coefficient At Various Degrees Omentioning

confidence: 99%

A model for predicting the relative chloride diffusion coefficient in unsaturated cementitious materials

Zhang

2019

Cement and Concrete Research

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Ionic aqueous diffusion through unsaturated cementitious materials – A comparative study

Cited by 25 publications

References 16 publications

Dependence of unsaturated chloride diffusion on the pore structure in cementitious materials

Dependence of unsaturated chloride diffusion on the pore structure in cementitious materials

Influence of moisture condition on chloride diffusion in partially saturated ordinary Portland cement mortar

A model for predicting the relative chloride diffusion coefficient in unsaturated cementitious materials

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