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| 粉煤灰-矿渣碱激发地聚物在霍普金森压杆下的动态力学性能研究 |
| Study on the Dynamic Mechanical Properties of Fly Ash-Slag Alkali-Activated Geopolymer Under Hopkinson Pressure Bar |
| 投稿时间：2025-12-10 修订日期：2026-04-19 |
| DOI： |
| 中文关键词: 粉煤灰 矿渣 地聚物 动态力学性能 SHPB |
| 英文关键词: Fly ash Slag Geopolymer Dynamic mechanical properties SHPB |
| 基金项目:国家自然基金青年科学(编号:52308227):安徽省高校省级自然科学研究重点项目(2022AH050261)；安徽建筑大学校引进人才及博士启动(2022QDZ23)；2025年度大学生创新创业训练项目(202510878001、202510878002)。 |
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| 中文摘要: |
| 论文探讨了在固定水料比（0.4）与碱度（6）的条件下，地聚物在霍普金森压杆（SHPB）实验中的动态力学性能。研究结果表明：制备同等体积地聚物，可通过适量增加砂与水的用量，减少其碱性激发剂的用量并提升动态力学性能。砂掺量为50%，碱性激发剂用量减少28.5%，在SHPB冲击气压为0.1 MPa时，GPM抗冲击强度最高，达到109.1 MPa，此刻弹性能储存量（UCe = 1307.85 kJ/m3）且弹性能占比最高（为69.80%)。微观结构分析表明，S0.5组试样中凝胶体致密均匀，砂-凝胶界面结合紧密，微观裂缝数量少、尺度小，有效抑制了应力集中现象。过量掺入砂与水则导致凝胶结构疏松、反应程度不足，宏观裂缝扩展显著，力学性能劣化。 |
| 英文摘要: |
| This paper investigates the dynamic mechanical properties of geopolymers in the Hopkinson bar (SHPB) test under fixed water-to-binder ratios (0.4) and alkalinity (6). The results indicate that, for a given volume of geopolymer, increasing the amounts of sand and water appropriately can reduce the required amount of alkaline activator and improve dynamic mechanical properties. With a sand content of 50% and a 28.5% reduction in the amount of alkaline activator, the GPM achieved the highest impact strength of 109.1 MPa at an SHPB impact pressure of 0.1 MPa. At this point, the elastic energy storage (UCe = 1307.85 kJ/m3) was highest, while the proportion of elastic energy was the highest ( 63.80%). Microstructural analysis indicates that in the S0.5 group, the gel matrix is dense and uniform, with a tightly bonded sand-gel interface. The number of microcracks is low and their size is small, effectively suppressing stress concentration. Excessive sand and water content, however, leads to a loose gel structure and insufficient reaction, resulting in significant macroscopic crack propagation and a deterioration in mechanical properties. |
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