Effects of Different Ratios of Fly Ash and River Sand on Mechanical Properties of Cemented Paste Backfill Materials

Figure 5

Microstructure of samples with different proportions: (a)–(d) are images of 300x F0–F0.6 magnification; (e)–(h) is an image magnified by 5,000 times F0–F0.6.

(a)

(b)

(c)

(d)

(e)

(f)

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(h)