The recycling and sustainable utilization of reclaimed asphalt pavement (RAP) are the key method to improve resource conservation and reduce energy consumption in roadway construction. The cold-recycled technology has been regarded as a promising recycling one because it can achieve mixing at room temperature and high utilization of RAP. Investigating the mechanical mechanism of cold-recycled asphalt mixture (CRAM) is the basis for large-scale application. Thus the splitting tests were carried out to study the influencing law of the material components on the strength performance of CRAM by varying RAP, cement and asphalt content. Then the effects of material component on the strength mechanism were further revealed by the interface characteristics analysis, including void and filler parameters, binder and interface transition zone (ITZ) thickness. The results show that the CRAM with more RAP has a higher splitting strength and the aged asphalt contributes to the reduction of void number around the aggregate interface, indicating a stronger bonding effect with binder. The asphalt mixture has lower void size, void number and porosity than cement mixture, and shows more uniform distribution of binder thickness and lower void distribution difference between the ITZ and the mortar phase, which is conducive to force uniformly and prevent stress concentration within mixture. The above outcomes confirm the effects of strength improvement from RAP and the void increment from cement, and the contents could be reasonably increased for RAP and strictly controlled for cement to ensure strength performance of CRAM while promoting saving energy and environmental protection.

再生沥青路面（RAP）的循环利用和可持续利用是提高道路建设资源节约和降低能源消耗的关键方法。冷再生技术因其可以实现室温混合和RAP的高利用率而被认为是一种很有前景的再生技术。研究冷再生沥青混合料（CRAM）的力学机理是大规模应用的基础。为此进行劈裂试验，研究了材料组分在RAP、水泥和沥青含量. 然后通过界面特征分析进一步揭示了材料成分对强度机制的影响，包括空隙和填料参数、粘合剂和界面过渡区（ITZ）厚度。结果表明，RAP较多的CRAM具有较高的劈裂强度，老化沥青有助于减少骨料界面周围的空隙数，表明与粘结剂的粘结作用更强。沥青混合料具有比沥青混合料更低的空隙尺寸、空隙数和孔隙率。水泥混合料中，粘结剂厚度分布更均匀，ITZ与砂浆相间空隙分布差异更小，有利于受力均匀，防止混合料内应力集中。上述结果证实了RAP提高强度和水泥增加空隙率的效果，可以合理增加RAP的含量并严格控制水泥的含量，以确保CRAM的强度性能，同时促进节能环保。