Investigation of Engineering Properties and Solidification Mechanism of Loess by Sodium Silicate Alkali-Activated Coal Gangue Powder

Figure 9

SEM images of the shell of each group of specimens at 28 days: (a) JC1, (b) JC2, (c) JC3, (d) JC4, and (e) JC5.

(a)

(b)

(c)

(d)

(e)