The purpose of this study is the investigation of the joint impact of various compositional parameters on the mechanical properties of metakaolin-based geopolymers using central composite design. The factors studied were the NaOH concentration, the mass ratio Na₂SiO₃/NaOH and solid/liquid mass ratio. The effect of these parameters on the compressive strength of metakaolin based geopolymers was evaluated. Seventeen experiments were undertaken to arrive at a second-order mathematical model linking the response function to the different factors and allowing better control of the formulation procedure. The obtained compressive strength was 34.81 MPa with NaOH=14 M, Na₂SiO₃/NaOH mass ratio=2.5, and solid/liquid mass ratio=1.5 as optimal operating conditions. Physicochemical properties of the metakaolin, and the elaborated specimens were analyzed using several analytical methods as XRD, FTIR, SEM and EDX methods. The results of the analysis of the specimens demonstrated that the optimal sample exhibits a formation of amorphous aluminasilicate gel which increases the compressive strength.

这项研究的目的是使用中心复合设计研究各种组成参数对偏高岭土基聚合物的力学性能的联合影响。研究的因素是NaOH浓度，Na ₂ SiO ₃ / NaOH的质量比和固/液质量比。评估了这些参数对偏高岭土基聚合物抗压强度的影响。进行了十七项实验，以得出将响应函数与不同因素联系起来并允许更好地控制配制过程的二阶数学模型。在NaOH = 14 M，Na ₂ SiO _3下获得的抗压强度为34.81 MPa/ NaOH质量比＝ 2.5，并且固/液质量比＝ 1.5作为最佳操作条件。偏高岭土的物理化学性质以及精心制作的标本使用多种分析方法进行了分析，如XRD，FTIR，SEM和EDX方法。样品的分析结果表明，最佳样品表现出无定形硅铝酸盐凝胶的形成，这增加了抗压强度。