In this study, Taguchi-Grey relational analysis was used to investigate and optimize the effect of ground granulated blast furnace slag (GGBS) replacement, water to geopolymer solids (W/GPS) ratio, molarity of NaOH solution, binder content and Na₂SiO₃ to NaOH solution ratio on setting time, workability and compressive strength of fly ash - GGBS based geopolymer concrete (GPC). After arriving at the optimal combination of mix parameters, verification experiments were conducted on the proposed optimized GPC mix with respect to fresh (setting time and workability) and hardened (compressive strength, flexural strength and splitting tensile strength) properties. The microstructural studies on selected fly ash-GGBS based GPC mixes at each GGBS replacement level and the proposed optimized GPC mix were conducted through X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and Field emission scanning electron microscopy (FESEM) analyses. The obtained results showed that GGBS replacement had dominant effect on setting time and compressive strength whereas W/GPS ratio significantly influenced workability of GPC. Variations in formations of N-(C)-A-S-H and C-S-H gels in GPC were confirmed from the results of microstructure analyses. The obtained results of the verification experiment on the proposed optimized GPC mix confirmed the effectiveness of Taguchi-GRA approach for determining the optimal combination of mix parameters for the production of geopolymer concrete.

在这项研究中，使用Taguchi-Grey关系分析来研究和优化研磨粒状高炉矿渣（GGBS）替代，水与地质聚合物固体（W / GPS）的比例，NaOH溶液的摩尔浓度，粘合剂含量和Na ₂ SiO的影响₃与NaOH溶液的比例对粉煤灰-GGBS基地聚合物混凝土（GPC）的凝结时间，可加工性和抗压强度的影响。在达到最佳的混合参数组合后，针对建议的优化GPC混合料进行了新鲜（凝固时间和可加工性）和硬化（抗压强度，抗弯强度和劈裂抗拉强度）性能方面的验证实验。通过X射线衍射（XRD），傅里叶变换红外（FTIR）光谱和场发射扫描电子显微镜（FESEM）对选定的粉煤灰-GGBS基GPC混合物在每个GGBS替代水平和建议的优化GPC混合物进行了显微组织研究分析。获得的结果表明，GGBS的替代对凝结时间和抗压强度具有显着影响，而W / GPS比则显着影响GPC的可加工性。从微观结构分析的结果证实了GPC中N-（C）-ASH和CSH凝胶的形成存在差异。对建议的优化GPC混合料进行的验证实验所获得的结果证实了Taguchi-GRA方法对于确定用于生产地质聚合物混凝土的最佳混合参数组合的有效性。