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Abstract—We conducted a Design of Experiments to analyze and optimize the effect of the SiO2/K2O, H2O/K2O molar ratios of a Potassium base activating solution, slag/solution, Wollastonite/Slag mass ratios and mixing amount in the compressive strength and setting time of alkali activated Ground granulated Blast Furnace Slag. It was found that the total amount mixed had little to no effect in the compressive strength and the setting time. The setting time was largely affected by the slag/solution mass ratio followed by the SiO2/K2O molar ratio in the activating solution. For the compressive strength the larges correlation was found in the joint effect of the slag/solution and Wollastonite/slag mass ratios. The optimum formulation had seventh day compressive strength of 8000 Psi (55 Mpa) and setting time of 36 minutes was found when the activating solution had molar ratios of SiO2/K2O =1, H2O/K2O =10 and mass ratios of slag/solution = 1.75 and Wollastonite/Slag=0.37