This study focuses on novel technologies that provide breakthrough CO2 capture and performance. This research aims to identify the usual consistency and to set the time of geopolymer paste to ensure that cement may be substituted with calcined materials. However, it is necessary first to investigate the properties of geopolymer paste, including varied proportions of calcined materials and sodium hydroxide concentrations. According to the published studies, there is a shortage of studies on the entire replacement of fly ash with GGBS (0-100%) with varying concentrations of sodium hydroxide (8M-12M) with an SS/SH ratio of 2.5. Thus, this work might be unique. Moreover, this research work would stand as a benchmark for future researchers in this area. Thus, 198 specimens were prepared to determine the geopolymer paste’s normal consistency and setting behavior. The experimental results showed that increasing the amount of GGBS to geopolymer paste reduces the setting time of the paste and raises the standard consistency value for intermediate mixes compared to fly ash combinations. The key finding of this investigation is that an increase in sodium hydroxide concentration does not affect the normal consistency. As a result, the consistency is determined to be 37 percent when using a combination of 80 percent GGBS and 20 percent fly ash is shown to be the most effective in achieving higher performance.