Steel corrosion in concrete with ground granulated blast furnace slag
Kobayashi Koichi; Nakamura Shiro; Hattori Atsushi; Miyagawa Toyoaki
Abstract:This paper deals with the corrosion of steel bar in concrete with ground granulated blast furnace slag (ggbs). The steel corrosion in it were investigated with the aid of electrochemical measurement. The ability of ggbs concrete to protect steel from corrosion was superior to the one of the ordinary Portland cement concrete, although the chloride binding capacity of ggbs concrete is inferior to the one of ordinary Portland cement concrete. On the other hand, the carbonation rate of ggbs was faster and there was the risk of steel corrosion due to carbonation of ggbs concrete. And the steel corrosion in ggbs concrete exposed to both chloride and carbonation was produced earlier and more severe than the one in ordinary Portland cement concrete. Key Words:ground granulated blast furnace slag, steel corrosion, chloride, carbonation, polarization resistance