This study aims to investigate the workability, visual appearance and mass loss, compressive, and flexural strength properties of the single and hybrid glass (GL) and basalt (BA) fiber added fly ash (FA)-based geopolymer cement (GPC) mortars after the high-temperature effect. Micro- and macro - GL and BA fibers were added to the GPC mixtures in two different volumetric ratios, 0.5% and 1%. 300, 500, and 800 °C of high temperatures were applied to the GPC mortar samples. After the high-temperature effect, microstructural variations of selected GPC mortar specimens were determined using scanning electron microscope (SEM) analysis tests. As a result of the study, it was seen that the use of GL and BA fiber had a very negative effect on the workability of the mixtures and caused a significant decrease in the spreading diameters. Compared to the control concrete, it was observed that the GPC samples with GL and BA fiber additives had considerably higher (upper 5%) residual compressive and flexural strengths after the high-temperature effect. Furthermore, the hybrid use of GL and BA fibers is somewhat more effective than single GL and BA fibers in increasing the residual compressive and flexural strengths of the GPC mortar samples after the effect of high temperature. In addition, since GL fibers are less agglomerated and exhibit a more homogeneous distribution in blends, they are slightly more effective in improving both workability and residual compressive and flexural strengths of GPC mortar samples compared to BA fibers.

本研究旨在研究添加粉煤灰 (FA) 基地质聚合物水泥 (GPC) 砂浆的单一和混合玻璃 (GL) 和玄武岩 (BA) 砂浆的可加工性、外观和质量损失、抗压和抗弯强度性能。高温效应。微观和宏观 - GL 和 BA 纤维以两种不同的体积比（0.5% 和 1% ）添加到 GPC 混合物中。对 GPC 砂浆样品施加 300、500 和 800 °C 的高温。在高温作用后，使用扫描电子显微镜确定所选 GPC 砂浆试样的微观结构变化(SEM) 分析测试。研究结果表明，使用 GL 和 BA 纤维对混合物的可加工性有非常负面的影响，并导致铺展直径显着降低。与对照混凝土相比，观察到含有 GL 和 BA 纤维添加剂的 GPC 样品在高温作用后具有显着更高的残余抗压强度和抗弯强度（高于 5%）。此外，GL 和 BA 纤维的混合使用在增加 GPC 砂浆样品在高温作用后的残余抗压强度和抗弯强度方面比单一的 GL 和 BA 纤维更有效。此外，由于 GL 纤维结块较少，并且在混合物中表现出更均匀的分布，