Mechanical Properties and Hardening Mechanism of Magnesium Ammonium Phosphate Cements Modified by Fly Ash

Figure 6

SEM images of FA0 at 3 hr, 3, and 28 days: (a) FA0 3 hr; (b) FA0 3 days; (c) FA0 28 days.

(a)

(b)

(c)