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| 基于原料组成结构对温拌再生沥青抗裂性能的影响分析 |
| Analysis of the Effect of Raw Material Composition Structure on the Anti-cracking Performance of Warm-mix Recycled Asphalt |
| 投稿时间：2025-11-19 |
| DOI：10.16018/j.cnki.cn32-1650/n.202601002 |
| 中文关键词: 温拌再生技术 分子结构 元素分析 双边缺口拉伸试验 |
| 英文关键词: warm-mix recycling technology molecular structure elemental analysis double-edge notched tension test |
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| 中文摘要: |
| 为探究沥青原料组成结构对温拌再生沥青抗裂性能的影响，选取2种不同油源的基质沥青(70#A和70#B)，根据四组分分析、元素分析等手段解析原料沥青的化学组成与分子结构；将基质沥青制成老化沥青，在进行新旧沥青的融合再生后，分别添加5%、7%、9%的温拌再生剂制备温拌再生沥青；最后采用双边缺口拉伸试验评估几种沥青的抗裂性能。结果表明，两种原料的沥青在针入度、软化点、延度和动力黏度上差异不显著，但化学组成存在明显区别，表现为70#A的沥青质含量远高于70#B，而70#B的饱和酚和芳香酚含量较高，表明70#B具有更强的抗裂性；两种70#沥青均出现老化后脆性显著增强，峰值荷载上升的现象；温拌再生剂的加入能有效恢复沥青的延性，7%掺量的沥青抗裂性能最优。 |
| 英文摘要: |
| To investigate the effect of the composition and structure of asphalt raw materials on the crack resistance of warm-mix recycled asphalt, this study selected two base asphalts from different oil sources (70#A and 70#B). The chemical composition and molecular structure of the raw asphalt were analyzed through methods such as four-component analysis and elemental analysis. The base asphalts were aged to produce aged asphalt, and after blending new and old asphalt for recycling, 5%, 7%, and 9% of warm-mix rejuvenator were added to prepare warm-mix recycled asphalt. Finally, a double-edge notched tensile test was used to evaluate the crack resistance of the prepared asphalt blends. The results show that the two raw asphalts did not differ significantly in conventional properties (penetration, softening point, ductility) and dynamic viscosity, but their chemical compositions were significantly different. Specifically, 70#A had a much higher asphaltene content than 70#B, while 70#B had higher contents of saturates and aromatics, indicating that 70#B has stronger crack resistance. Both 70# asphalts showed significantly increased brittleness and an increase in peak load after aging. The addition of warm-mix rejuvenator effectively restored the ductility of the asphalt, and the sample with a 7% dosage exhibited the best crack resistance. |
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