Determination of chloride diffusivity through partially saturated Portland cement concrete by a simplified procedure

Guimarães, A.T.C.; Climent, M.Á.; Almenar, Guillem de Vera; Vicente, F.J.; Rodrigues, Felipe Trez; Andrade, Carmen

doi:10.1016/j.conbuildmat.2010.07.005

Cited by 63 publications

(26 citation statements)

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“…The higher DCS values towards the exposed surface, indicates that there is moisture uptake from the environment in the outer part of the concrete. The lower DCS in the bulk concrete might lead to a reduced diffusion rate of chlorides in the bulk [33,34]. This might in addition to changes in surface concentration affect the evolution of the apparent diffusion coefficient with time.…”

Section: Effect Of Moisture On Chloride Ingressmentioning

confidence: 93%

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Weerdt

Orsáková

Müller

et al. 2016

Construction and Building Materials

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Section: Effect Of Moisture On Chloride Ingressmentioning

confidence: 93%

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Weerdt

Orsáková

Müller

et al. 2016

Construction and Building Materials

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“…These investigations were based on either direct diffusion tests or conductivity technique. For the direct diffusion tests, a chloride source can be imposed on the outer surface of unsaturated concretes through gaseous hydrogen chloride [7], chloride-containing solution [8] or solid crystal (sodium chloride) [9]. After a certain period of test, the chloride profiles were obtained by grinding successive parallel layers and quantifying the chloride content in each layer with potentiometric titration [10].…”

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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“…Owing to restrictions on the size of the diffusion test specimen proposed by Guimarães and Helene, 10,11 after casting the specimens for compressive strength, a portion of each one of the fresh concretes was sieved through a 9.5‐mm sieve, in order to prepare the representative small concrete specimens required for diffusion tests and mercury intrusion porosimetry (MIP). All specimens for the same mix proportion were cast from the same batch.…”

Section: Methodsmentioning

confidence: 99%

Comparison BetweenD_critConsidering the Abrupt Variation and Inﬂexion in the Concrete Mercury Intrusion Porosimetry Curve

Guimarães

Almenar

Rodrigues

et al. 2012

Experimental Techniques

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Mercury intrusion porosimetry (MIP) has been widely used to evaluate the quality of concrete through the pore size distribution parameters. Two of these parameters are the critical pore diameter (D crit ) and the percentage of the most interconnected net of pores compared to the total volume of pores. Some researchers consider D crit as the diameter obtained from the inflexion point of the cumulative mercury intrusion curve while others consider D crit as the diameter obtained from the point of abrupt variation in the same curve. This study aims to analyze two groups of concretes of varying w/c ratios, one cast with pozzolanic cement and another with high initial strength cement, in order to determine which of these diameters feature a better correlation with the quality parameters of the concretes. The concrete quality parameters used for the evaluations were (1) the w/c ratios and (2) chloride diffusion coefficients measured at approximately 90 days. MIP cumulative distributions of the same concretes were also measured at about 90 days, and D crit values were determined (1) from the point of abrupt variation and alternatively, (2) from the inflexion point of each of these plots. It was found that D crit values measured from the point of abrupt variation were useful indicators of the quality of the concrete, but the D crit values based on the inflexion points were not. Hence, it is recommended that D crit and the percentage of the most interconnected volume of pores should be obtained considering the point of abrupt variation of the cumulative curve of pore size distribution.

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Determination of chloride diffusivity through partially saturated Portland cement concrete by a simplified procedure

Cited by 63 publications

References 20 publications

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

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

Comparison BetweenD_critConsidering the Abrupt Variation and Inﬂexion in the Concrete Mercury Intrusion Porosimetry Curve

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Determination of chloride diffusivity through partially saturated Portland cement concrete by a simplified procedure

Cited by 63 publications

References 20 publications

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

Towards the understanding of chloride profiles in marine exposed concrete, impact of leaching and moisture content

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

Comparison BetweenDcritConsidering the Abrupt Variation and Inﬂexion in the Concrete Mercury Intrusion Porosimetry Curve

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Comparison BetweenD_critConsidering the Abrupt Variation and Inﬂexion in the Concrete Mercury Intrusion Porosimetry Curve