Researchers all over the globe are still working to arrive at an intentionally standard mix design for geopolymer concrete (Singh and Kapoor, 2022). To enhance the compressive strength of geopolymer concrete, this study investigates the impact of the metakaolin content, liquid-to-solid (L/S) ratio and the sodium silicate-to-sodium hydroxide (SS/SH) ratio. 20 sets of experiments were designed and tested for the compressive strength based on the response surface methodology technique. The optimal parameters were obtained via modeling of the 3 factors (metakaolin content, L/S ratio and SS/SH ratio) and 3 levels of compressive strength (3 day, 7 day and 28 day). The optimized results showed that the highest compressive strengths of the geopolymer concrete are 16.9N/mm2 for 3 day, 30.3N/mm2 for 7 day and 44.1N/mm2 for 28 day curing when the three optimized factors are 420 grams for metakaolin content, 0.8 for L/S ratio and 1.7 for SS/SH ratio. Finally, the optimized factors (A) of 420 grams and factor C of 1.7 are higher by 5% and 13% than the actual test data of 400 grams and 1.5 for factors A and C respectively. It can then be concluded that the optimized factors setting influences the responses more than the actual test data.
Abubakar et al. (Thu,) studied this question.