Effect and Mechanism of Superplasticizers on Performance of Ultrafine Sulfoaluminate Cement-Based Grouting Materials

Figure 9

SEM photograph for each sample: (a) blank sample for 4 h; (b) sample doped with PCE for 4 h; (c) sample doped with FDN for 4 h; (d) blank sample for 7 d; (e) sample doped with PCE for 7 d; (f) sample doped with FDN for 7 d.

(a)

(b)

(c)

(d)

(e)

(f)