Influence of Alternation of Sulfate Attack and Freeze-Thaw on Microstructure of Concrete

Figure 7

SEM images of samples (((a), (b), (c)) erosion in 5% sodium sulfate solution for 120 days; ((d), (e), (f)) two hundred times’ freeze-thaw; ((g), (h), (i)) four times’ erosion freeze-thaw alternation).