Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

Figure 9

SEM images of CGCAB at day 28 and (a) 0% (C0), (b) 20% (C2), and (c) 40% (C4) substitution rates.

(a)

(b)

(c)