Multi-species ionic diffusion in concrete with account to interaction between ions in the pore solution and the cement hydrates

摘要: The penetration and leaching of ionic species in concrete are studied by using a model based on the Nernst–Planck equations. A finite element procedure is used to solve coupled non-linear governing numerical example performed which results compared measured electron probe micro analysis (EPMA) data. close agreement simulated data found for specific example. includes Cl−, Na+, OH−, Ca2+, K+ SO 4 2− solid phases with variable composition. From EPMA measurements total concentration profiles CaO, SiO2, Na2O SO3 evaluated samples exposed 3 wt% sodium chloride solution 1 year. main task this investigation quantitatively understand underlying mechanisms find an accurate that gives good correlation experimental concerning multi-species action during penetration. In chemical interaction between ions solids pore assumed governed simple ion exchange processes only. drawback approach part lacking important physical relevance terms standard solubility thermodynamics. On other hand presented capable accurately simulate well documented peak behavior high content calcium under conditions when also chlorides present. sense established models calculations alone still incomplete.