A mathematical model in charactering chloride diffusivity in unsaturated cementitious material

A mathematical model in charactering chloride diffusivity in unsaturated cementitious material

Zhang, Y. (TU Delft Materials and Environment)
Ye, G. (TU Delft Materials and Environment)

Pecur, I.B. (editor)
Baricevic, A. (editor)
Stirmer, N (editor)
Bjegovic, D. (editor)

2017

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.

Flexible mould
rheology
thixotropy
deformation
cracking

http://resolver.tudelft.nl/uuid:b8de0170-889b-4576-ac20-80f575352cea

978-953-8168-04-8

1st International Conference on Construction Materials for Sustainable Future,: 19-21 April 2017, Zadar, Croatia

1st International Conference on Construction Materials for Sustainable Future, 2017-04-19 → 2017-04-21, Zadar, Croatia

Institutional Repository

conference paper

© 2017 Y. Zhang, G. Ye