Influence of Nano-SiO₂ on the Consistency, Setting Time, Early-Age Strength, and Shrinkage of Composite Cement Pastes

Figure 8

SEM photographs of 1#, A2, B2, and C1 samples at the age of 3 d.

(a) 1#: pure cement

(b) A2: addition of 4.0% SF

(c) B2: addition of 4.0% NS

(d) C1: addition of 30% FA