Preparation of a New Borehole Sealing Material of Coal Seam Water Infusion

Figure 8

Microstructure comparison of three kinds of materials. (a) First day (×50). (b) Seventh day (×50). (c) First day (×500). (d) Seventh day (×500). (e) First day (×500). (f) Seventh day (×500).

(a)

(b)

(c)

(d)

(e)

(f)