Research Article

Experimental Study and Application of Inorganic Solidified Foam Filling Material for Coal Mines

Figure 8

SEM scan grams on materials at different curing ages.
(a) 1 d (1,000 times)
(b) 1 d (5,000 times)
(c) 28 d (1,000 times)
(d) 28 d (5,000 times)