Fig. 8.

SEM micrograph of a corroding section (BSE detector, acquired at 20 kV and 85 × magnification): a overview of the corroding section made by stitching together the micrographs collected at the SCI, where the rebar is visible in white, the corrosion products in light gray, the concrete matrix in dark gray and the air voids in black (the red dotted-line box is representative of the zoomed-in area reported in Fig. 8b, while the yellow boxes are areas shown at higher magnification in Fig. 9a–b); b Corrosion site in proximity to an interfacial air void, which is partially filled by corrosion products. Note that the orientation of the reinforcement herein reported may be different from the actual orientation of the steel when it was embedded in concrete, of which no information could be obtained