C oncrete, one of the most important materials in infrastructure development, is generally composed of the main composition of coarse aggregate, fine aggregate, water, Portland Cement (SP) and other additives. In the production process of the Portland Cement (SP) release of carbon dioxide (CO2) which is a major contributor to gas and greenhouse gas emissions, causes global warming. This study aims to determine the compressive strength, slump value and bonding time of C-type fly ash geopolymer concrete with the addition of viscocrete type superplasticizer. The research method uses cylindrical specimens with a diameter of 100 mm and a height of 200 mm with additional viscocrete content of 0%, 1%, 1.5%, and 2%. Compressive strength testing when it reaches 3 days, 7 days, 14 days and 28 days. From the results of the study, it was concluded that the higher the viscocrete superplasticizer content, the higher the value of the slump produced would be higher and the resulting bonding time would be longer, but the reduced compressive strength of the concrete would be reduced. The addition of viscocrete superplasticizer also affects the comparison of compressive strength values at the age of concrete 28 days of the 60 ° C curring oven, the value of the compressive strength produced is greater than 28 days of room temperature curing.