Strain-hardening geopolymer composites (SHGC) exhibit remarkable ductility, crack control and high energy dissipation capacity when subject to quasi-static tensile loading. However, their mechanical performance under dynamic loading has not yet been explored. A comprehensive assessment of possible rate effects is required to facilitate a targeted material design for various practical applications. The article presents the results of an experimental investigation on the mechanical behavior of two types of SHGC under both quasi-static and impact tensile loading. The composites were reinforced with 2% of either short polyvinyl alcohol (PVA) fiber or ultra-high molecular-weight polyethylene (UHMWPE) fiber. The experiments were performed both at the composite scale and at the fiber level. The impact tests on the plain geopolymer matrix and SHGC were performed in a gravity-driven split-Hopkinson tension bar (SHTB) at strain rates of up to 300 s⁻¹. The tests were accompanied by optical measurements to assess specimen deformation and multiple cracking by means of Digital Image Correlation (DIC). The dynamic fiber-matrix bond properties were investigated in a miniature split Hopkinson bar. Both under quasi-static tensile loading and impact tensile loading, the SHGC made with UHMWPE fibers exhibited superior mechanical performance compared to the composite made with PVA fibers. When comparing the impact tensile performance of SHGC with normal-strength SHCC from previous studies, SHGC demonstrated higher dynamic tensile strength and energy dissipation capacity, making SHGC promising for strengthening/prospective applications against highly dynamic actions.

当经受准静态拉伸载荷时，应变硬化地质聚合物复合材料（SHGC）表现出显着的延展性，裂纹控制和高耗能能力。但是，尚未研究它们在动态载荷下的机械性能。需要对可能的速率影响进行全面评估，以促进针对各种实际应用的目标材料设计。本文介绍了两种类型的SHGC在准静态和冲击拉伸载荷下的力学行为的实验研究结果。复合材料用2％的短聚乙烯醇（PVA）纤维或超高分子量聚乙烯（UHMWPE）纤维增强。实验是在复合材料规模和纤维水平上进行的。^-1。测试同时进行光学测量，以通过数字图像相关性（DIC）评估样品变形和多次破裂。在微型分裂霍普金森棒中研究了动态纤维-基体粘结性能。在准静态拉伸载荷和冲击拉伸载荷下，与由PVA纤维制成的复合材料相比，由UHMWPE纤维制成的SHGC表现出优异的机械性能。当将SHGC的冲击拉伸性能与之前研究的标准强度SHCC进行比较时，SHGC表现出更高的动态拉伸强度和能量耗散能力，这使SHGC有望在加强/预期应用中抵抗高动态作用。