[1111] EFFECT OF CYCLIC WETTING-AND-DRYING CONDITION ON CARBONATION-INDUCED CORROSION
Keywords:steel corrosion、 carbonation、 moisture content、 cyclic wetting and drying
Most concrete buildings are exposed to variable environment, the moisture content inside concrete may be changeable under natural weather characterized by sunshine and rainfall. In addition, such concrete buildings always suffered from carbonation especially for the buildings out of service life. The changing moisture content inside the concrete may promote the steel corrosion and increase the deterioration risk. This study investigated the effect of cyclic wetting-and-drying condition on corrosion behavior of carbonated and chloride-attacked mortar. The comparison of corrosion rate and corrosion potential among noncarbonated, carbonated mortar and chloride-contained mortar were made. Corrosion parameters of reinforcing steel bar were measured with electrochemical device. The results indicated that under cyclic wetting-and-drying condition, steel corrosion rate varies with moisture content. Steel corrosion of carbonated mortar is less susceptible to water content than that of noncarbonated ones due to the higher porosity.