Advances in Engineering Advances in Engineering features breaking research judged by Advances in Engineering advisory team to be of key importance in the Engineering field. Papers are selected from over 10,000 published each week from most peer reviewed journals.
Cement and Concrete Composites, Volume 40, 2013, Pages 40–47.
Nilla Olsson, Véronique Baroghel-Bouny, Lars-Olof Nilsson, Mickaël Thiery.
Laboratory of Building Materials, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden &
Materials Department, IFSTTAR, 4-20 Boulevard Newton Cité Descartes, Champs sur Marne, F-77447 Marne la Vallée Cedex 2, France.
Abstract
Non-saturated ion diffusion properties of cementitious materials were evaluated in an experimental study. To assess these properties, resistivity measurements have been performed on mortars with different binders (ordinary Portland cement – OPC, OPC with 5% silica fume, 40% slag and 70% slag, respectively) and different water-to-binder ratios (w/b, 0.38 and 0.53). Specimens have been conditioned to eight different climates with relative humidity (RH) from 100% to 33% RH in order to assess an effective diffusion coefficient. The results from the resistivity measurements have been corrected for changes of the conductivity of the pore solution when drying to different degrees of saturation.
The diffusion coefficients for Portland cement binders within the range 100–59% RH are presented. They showed that the diffusion coefficient of the mortar with high w/b ratio was higher at high RH, but at low RH the opposite trend was found. By comparing these results with the corresponding desorption isotherms, it is shown that the diffusion coefficient for the two w/b ratios have the same dependency on the degree of saturation.
