Microstructure as a key parameter for understanding chloride ingress in alkali-activated mortars

This study aims to evaluate the influence of microstructural properties on chloride diffusion resistance alkali-activated materials (AAMs) based blast furnace slag and/or fly ash, with variable activator doses (represented as Na 2 O%). Resistance penetration was tested using accelerated (NT BUILD 443) and migration 492) tests. Addition mortars mainly ash reduced porosity permeability. Chloride decreased increasing O%, but pore structure did not follow same trend. The threshold ( d th ) critical radius r crit determined by mercury intrusion porosimetry had a good correlation coefficient. Both quantification reaction products between surface area indicated that physical adsorption C-A-S-H/N-A-S-H gel surfaces predominated over chemical binding.