This work focused on the development and characterization of fly ash based polyvinyl alcohol fiber reinforced Engineered Geopolymer Composites incorporating Metakaolin (MFA-EGC). Both mechanical properties and microstructural characteristics were studied. The optimal mix design of the MFA-EGC was selected using the Taguchi method. The tensile strain capacities of the optimal mix at 3d, 7d and 28d can reach 6.8%, 6.4% and 5.2%, respectively. Multi-cracking is a pronounced phenomenon of the MFA-EGC. The cracks are uniformly distributed, with the spacing of 2-5 μm and the average crack width of only ∼25 μm. It was demonstrated that the MFA-EGC can meet both the energy and the strength criteria required to achieve tensile strain hardening behavior, and saturated multi-cracking is expected. The microstructural analyses using XRD, FT-IR and SEM indicate that the reaction products of the hardened MFA-EGC were mainly amorphous aluminosilicate phases, while new crystalline phases were concluded insignificant.

这项工作的重点是结合了偏高岭土（MFA-EGC）的粉煤灰基聚乙烯醇纤维增强工程地质聚合物复合材料的开发和表征。研究了机械性能和微观结构特征。使用Taguchi方法选择了MFA-EGC的最佳混合设计。最佳混合物在3d，7d和28d时的拉伸应变能力分别可以达到6.8％，6.4％和5.2％。多重裂纹是MFA-EGC的明显现象。裂纹分布均匀，间距为2-5μm，平均裂纹宽度仅为〜25μm。结果表明，MFA-EGC可以满足实现拉伸应变硬化行为所需的能量和强度标准，并且有望实现饱和多裂纹。使用XRD进行微观结构分析，