Time and cold joint effect on chloride diffusion in concrete containing GGBFS under various loading conditions

•Evaluation of time effect on chloride diffusion in concrete with cold joint.•Combined effect of time and GGBFS on chloride diffusion in normal concrete.•Combined effect of time and GGBFS on chloride diffusion in cold joint concrete.•Similar but decreasing diffusion behavior due to long term curing regardless of cold joint and GGBFS.•Effectiveness of GGBFS in tensile and compressive region with decreasing chloride diffusion.