Influence of concentration change of calcium ions over time on their diffusion through sandstone

25th International Conference and Meeting of Departments, CONSTRUMAT 2019

Kobetiová, K.^1 ; Medve, I.^1 ; Keppert, M.^1 ; erný, R.^1

Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, Prague

166 29, Czech Republic^1

关键词: Calcium concentration;    Calcium ions;    Concentration change;    Initial concentration;    Laboratory conditions;    Model system;    Salt transport;    Service life prediction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/549/1/012043/pdf
DOI  :  10.1088/1757-899X/549/1/012043

来源: IOP

【 摘 要 】

Diffusion is one of the most important salt transport mechanisms. The knowledge of the rate of transport of ions in the pore system of building materials is thus of primary importance for their service life prediction. In this paper, the transport of Ca2+ in sandstone Mené was studied as a model system; two types of experiment were performed: a) without addition of Ca2+ ions for the achievement of original initial concentration and b) continuous addition of Ca2+ ions. The experiment was performed under laboratory conditions in a two-side plexiglass box at the ambient temperature of (20 2) °C for a period of 426 hours. Calcium concentrations were analyzed chelatometrically.