UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

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

Zhang, Y; Zhang, M; Ye, G; (2018) Influence of moisture condition on chloride diffusion in partially saturated ordinary Portland cement mortar. Materials and Structures , 51 , Article 36. 10.1617/s11527-018-1162-7. Green open access

[img]
Preview
Text
Accepted_M&S_05-02-2018.pdf - Accepted version

Download (1MB) | Preview

Abstract

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-to-cement (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 Drc depends on the degree of water saturation Sw and WVDI. At a given Sw level, the Drc is larger for a higher w/c ratio. The role of the w/c ratio in the Drc–Sw 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 Drc-value tends towards infinitely small. An increase of the w/c ratio results in a decrease of the critical saturation level.

Type: Article
Title: Influence of moisture condition on chloride diffusion in partially saturated ordinary Portland cement mortar
Open access status: An open access version is available from UCL Discovery
DOI: 10.1617/s11527-018-1162-7
Publisher version: http://doi.org/10.1617/s11527-018-1162-7
Language: English
Additional information: Copyright © The Author(s) 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Keywords: Chloride diffusion, Mortar, Moisture distribution, Water saturation, Pore size distribution
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10043848
Downloads since deposit
64Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item