Comparative Effect of Brick Powder and Fly Ash on the Mechanical Properties of Alkali-Activated Slag Composites

研究对比了砖粉(BP)与粉煤灰(FA)对碱激发矿渣复合材料(AASC)力学性能的影响，结果发现：在15%和30%掺量下，BP-AASC与FA-AASC极限应力接近，但FA-AASC随掺量增加极限应变显著提升，而BP-AASC变化较小。经不同温度养护后，BP-AASC在150℃时性能最优，FA-AASC则在100℃最佳。结合单轴拉伸试验、DIC裂缝分析和SEM微观表征，揭示了掺料类型与温度对AASC材料拉伸性能的协同作用机制。The effects of brick powder (BP) and fly ash (FA) on the mechanical properties of alkali-activated slag composites (AASC) were compared, and the results showed that the ultimate stress of BP-AASC and FA-AASC was close to that at 15% and 30% content, the ultimate strain of FA-AASC increased significantly with the increase of content, while the change of BP-AASC was small. After curing at different temperatures, BP-AASC had the best performance at 150˚C, and FA-AASC had the best performance at 100˚C. Combined with the uniaxial tensile test, DIC crack analysis, and SEM microscopic characterization, the synergistic mechanism of admixture type and temperature on the tensile properties of AASC materials was revealed.