A mathematical model in charactering chloride diffusivity in unsaturated cementitious material

Yong Zhang, Guang Ye

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

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Abstract

In this paper, a new analytic model for predicting chloride diffusivity in unsaturated cementitious materials is developed based on conductivity theory and Nernst-Einstein equation. The model specifies that chloride diffusivity in unsaturated cementitious materials can be mathematically described as a function of chloride diffusivity in saturated state, water saturation and average pore diameter of the material. A series of experiments were conducted in order to validate the model. Mortar samples with varying cementitious mixtures were cast and cured for one year, followed by oven drying at 50 °C until desired water saturation levels (18 to 100 %) and homogeneous moisture distribution were obtained. The electrical conductivities of mortar specimens at various water saturations were measured and then converted into chloride diffusivities by using Nernst-Einstein equation. It is found that the experimental results can be well described by the analytic model proposed in this work.
Original languageEnglish
Title of host publication1st International Conference on Construction Materials for Sustainable Future,
Subtitle of host publication19-21 April 2017, Zadar, Croatia
EditorsI.B. Pecur, A. Baricevic, N Stirmer, D. Bjegovic
Pages804-809
Number of pages8
ISBN (Electronic) 978-953-8168-04-8
Publication statusPublished - 2017
Event1st International Conference on Construction Materials for Sustainable Future - Zadar, Croatia
Duration: 19 Apr 201721 Apr 2017
Conference number: 1
http://www.grad.hr/coms/ocs/index.php/coms/coms2017

Conference

Conference1st International Conference on Construction Materials for Sustainable Future
Abbreviated titleCoMS 2017
CountryCroatia
CityZadar
Period19/04/1721/04/17
Internet address

Keywords

  • Flexible mould
  • rheology
  • thixotropy
  • deformation
  • cracking

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