Fig. 6From: Effect of Silica Fume on the Volume Expansion of Metakaolin-Based Geopolymer Considering the Silicon-to-Aluminum Molar RatioSEM images of geopolymer specimens: a S/A 1.0, b S/A 1.0 - SF15, c S/A 1.4, d S/A 1.4 - SF15, e S/A 1.8, and f S/A 1.8 - SF15.Back to article page