Fig. 8From: A Concise on the Effect of Calcium Oxide on the Properties of Alkali-Activated Materials: A Manual for Civil EngineersSEM images at the age of 7 days for AAS mortar samples cued at − 10 (a), AAS + 3% CaO cured at − 10 °C (b), AAS cured at 20 °C (c), AAS + 3% CaO cured at 20 °C (d) (Ju et al., 2020)Back to article page