【摘要】 为系统研究陕北5个典型矿源煤矸石骨料对混凝土（取代率分别为40%、70%和100%）损伤演化行为的影响，基于统计损伤理论，开展X射线荧光光谱（XRF）、X射线衍射（XRD）和扫描电子显微镜（SEM）等多尺度测试。研究结果表明：统计损伤模型能有效预测煤矸石混凝土的应力-应变关系；骨料含碳量是影响损伤演化的重要因素，当含碳量增至2.09%时，骨料压碎值增加100%，混凝土强度损失率超过36%，屈服损伤应变降低8.3%；而石英含量大于30%且SiO₂含量在50%～55%范围内时，协同活性矿物作用可使屈服损伤应变平均提升18.76%，显著抑制内部损伤扩展。基于研究成果，提出含碳量小于2%、石英含量大于30%、SiO₂含量在50%以上的煤矸石骨料优选标准，可将煤矸石混凝土强度损失降至最低。更多还原

【Abstract】 To systematically investigate the influence of coal gangue aggregates from five typical mining sources in Northern Shaanxi on the damage evolution behavior of concrete（at replacement ratios of 40%, 70%, and 100%）, multi-scale experimental techniques, including X-ray fluorescence（XRF）, X-ray diffraction（XRD）, and scanning electron microscopy（SEM）, were conducted based on statistical damage theory. The results demonstrate that the statistical damage model effectively predicts the stress-strain relationship of coal gangue aggregate concrete. The carbon content in the aggregates is identified as a critical factor affecting damage evolution. When the carbon content increases to 2. 09%, the aggregate crushing value doubles, the concrete strength loss rate exceeds 36%, and the fracture damage strain decreases by 8. 3%. In contrast, when the quartz content exceeds 30% and the SiO₂ content falls within the range of 50% ～ 55%, the synergistic effect of active minerals increases the fracture damage strain by an average of 18. 76%, significantly suppressing internal damage propagation. Based on these findings, optimal criteria for coal gangue aggregates were proposed: carbon content below 2%, quartz content above 30%, and SiO₂ content above 50%. Adhering to these standards can minimize the strength loss of coal gangue concrete.更多还原