Diffusion and distribution of chloride ions in carbonated concrete with fly ash

The chloride profile in carbonated concretes with fly ash were measured after rapid chloride permeability test, so as to investigate the influence of carbonation degree on chloride ions diffusion and distribution. It is found that fly ash improved the carbonation resistance of concrete with low water-to-binder ratios while reduced that with high water-to-binder ratios. The capacities of binding chloride and chloride penetration resistance were enhanced in the early stage of carbonation. However, both abilities were significantly reduced in the late carbonation stage. Moreover, in the late but not completely carbonated stage, a peak appeared in the chloride concentration profile. (C) 2019 Elsevier Ltd. All rights reserved.