Experimental study of chloride diffusivity in unsaturated ordinary Portland cement mortar

Yong Zhang, Guang Ye

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Experiments are carried out to investigate the chloride diffusivity in partially saturated ordinary Portland cement mortars with water-to-cement (w/c) ratios of 0.4, 0.5 and 0.6. Based on resistivity measurement and Nernst-Einstein equation, the chloride diffusivities of cement mortars at various water saturations are estimated. The pore structures of cement pastes obtained from mercury intrusion porosimetry tests are analysed, which provide basic insight into the moisture distribution of non-saturated cement mortars. It is found that the chloride diffusivity is highly dependent on water saturation. The dependency is closely related to the pore size distribution and pore connectivity of the material. There exists a critical saturation level at which the pore solution becomes discontinuous and ionic diffusion is impossible. An increase of the w/c ratio results in a decrease of the critical saturation level.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Advances in Construction Materials and Systems
Subtitle of host publicationChennai, India
EditorsM. Santhanam
PublisherRilem
Number of pages7
Publication statusPublished - 2017
EventInternational Conference on Advances in Construction Materials and Systems - IIT Madras & Hotel Leela Palace, Chennai, India
Duration: 3 Sep 20178 Sep 2017
http://rilem2017conference.org/

Conference

ConferenceInternational Conference on Advances in Construction Materials and Systems
Abbreviated titleICACMS-2017
CountryIndia
CityChennai
Period3/09/178/09/17
Internet address

Keywords

  • Chloride diffusivity
  • Mortar
  • Pore structure
  • Water saturation

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