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为提升废弃混凝土资源化利用效率，系统探究了硅灰与熟石灰单掺及复合改性对再生混凝土力学性能的影响。采用三重搅拌技术（triple mixing,TM），通过抗压试验和劈裂抗拉试验，研究再生混凝土的基本力学性能，并借助扫描电子显微镜（scanning electron microscope,SEM）解析其微观结构特征。结果表明：单掺硅灰或熟石灰对再生混凝土的抗压强度与劈裂抗拉强度提升有限，复合硅灰与熟石灰对其提升效果显著。微观分析显示，复合体系中的微观结构致密程度显著提高，骨料与浆体的粘接强度增强。研究成果可为再生粗骨料的应用提供参考。
Abstract：To improve the recycling efficiency of waste concrete, this study systematically investigated the effects of silica fume and hydrated lime modifications(both individual and in combination) on the mechanical properties of recycled aggregate concrete(RAC). The triple mixing technique was employed during concrete preparation. Compressive and splitting tensile tests were conducted to evaluate the fundamental mechanical properties of RAC, while scanning electron microscopy(SEM) was used to analyze its microstructural characteristics. The results demonstrated that the individual incorporation of either silica fume or hydrated lime yielded only marginal improvements in compressive strength and splitting tensile strength. In contrast, the composite modification combining both silica fume and hydrated lime significantly enhanced the mechanical performance of RAC. Microscopic analysis further revealed that the composite system substantially improved microstructural compactness and the interfical bonding between aggregates and cement paste. These findings provide valuable insights for the practical application of recycled coarse aggregates, demonstrating that optimized composite modification could effectively enhance the mechanical performance of recycled concrete while advancing sustainable resource utilization in construction.
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基本信息:
中图分类号:TU528
引用信息:
[1]邢贺,李艳,赵菲,等.熟石灰与硅灰对再生混凝土力学性能的协同作用[J].海南大学学报(自然科学版中英文),2026,44(01):51-61.
基金信息:
海南省自然科学基金高层次人才项目（520RC549）支持~~
2025-07-11
2025-07-11
2025-07-11