Dynamic Compression Properties and Deterioration of Red-Sandstone Subject to Cyclic Wet-Dry Treatment

Figure 4

SEM images of red-sandstone free from and after different numbers of wet-dry cycles: (a) untreated specimen; (b) specimen after 5 wet-dry cycles; (c) specimen after 10 wet-dry cycles; (d) specimen after 15 wet-dry cycles; (e) specimen after 20 wet-dry cycles. Note that the magnification ratio is 1200.

(a)

(b)

(c)

(d)

(e)