ASSESSMENT OF CONCRETE EXPOSED TO SALT CORROSIVE ENVIRONMENT AND USING GROUND GRANULATED BLAST-FURNACE SLAG (GGBFS) AND EPOXY-COATED REINFORCING BARS

In recent years, deteriorated concrete slabs have been renewed, and precast concrete slabs have been used to shorten the construction period because of the need to regulate roads in service. Further, ground granulated blast-furnace slag (GGBFS) concrete, and epoxy-coated reinforcing bars are used for the precast concrete slabs to enhance durability. However, few studies were conducted on the results of exposure test with GGBFS concrete, and there is a risk of deterioration of epoxy-coated reinforcing bars by ultraviolet rays when precast slabs are placed and the bars are temporarily exposed. In this paper, an exposure test was carried out in Okinawa to assess the performance of concrete incorporating GGBFS and epoxy-coated reinforcing bars. As a result, GGBFS has high durability even in the long-term exposure condition, and epoxy-coated reinforcing bars also satisfies the standard in the temporary placement.