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This study aims to understand how moisture, CO 2 , and chloride ions penetrate usable postfire concrete by using electrical resistivity data. Mortar and concrete specimens with water-to-cement ratios (W/Cs) of 0.35 and 0.45. Polypropylene (PP) fibers were added to the specimens with W/C of 0.35. One surface of each specimen was placed on a hot plate and exposed to 350°C for 15 min. The moisture transfer in the specimens stored at 20°C and 60% relative humidity was assessed by measuring theirdoi:10.3151/jact.17.1 fatcat:6lekoot4srh4fhdw2iaqbkjtqu