Fig. 6

Response surface of 3-day compressive strength of the geopolymer mortar: (a) D: Oven duration = 12 h, and (b) D: Oven duration = 24 h.

Response surface of 3-day compressive strength of the geopolymer mortar: (a) D: Oven duration = 12 h, and (b) D: Oven duration = 24 h.