Since the Great East Japan Earthquake in 2011, the emission rate of fly ash (FA) has increased. Because FA can be used in numerous applications, such as a concrete ingredient, this study concerns the possibility of expanding the use of FA in concrete structures. The effects of the binder type, carbonation, and presence of external water on the rebar corrosion was investigated. Experimental results indicated that the use of FA had a small effect on rebar corrosion. Moreover, rebar corrosion rapidly progressed in the presence of both carbonation and external water; thus, it can be suppressed by excluding either one.
