| 摘要: |
| 为探究木焦油基再生沥青的低温抗裂性能，采用室内试验，比较分析了基质沥青、木焦油基再生沥青和RA-102再生沥青的低温抗裂性能及其作用机理；采用灰色关联度分析方法，评价了沥青各性能指标与其低温抗裂性能间的相关性.结果表明：再生剂的加入可有效恢复老化沥青的低温变形能力及应力松弛能力，较大程度地抵抗低温对老化沥青产生的不利影响，但难以完全恢复至原样沥青水平；木焦油基再生剂可显著降低老化沥青的脆性和结晶度，且可在低温下抑制沥青结晶并提高分子链的柔韧性，进而改善应力松弛效应，提高延度；木焦油基再生剂可调和老化沥青组分并调节其胶体结构，有效改善沥青相对分子质量的集中程度，减弱分子间的作用力，降低大分子物质的相对含量.再生沥青各性能参数与其低温性能间的关联度差异较大，未来需建立再生剂类型与性能、再生沥青配比与再生沥青低温性能恢复间的多参数综合评价体系及指标，以实现对不同再生沥青低温抗裂性能的定向调控. |
| 关键词: 木焦油基再生沥青 低温抗裂性能 生物质材料 组分分析 红外光谱 |
| DOI：10.3969/j.issn.1007-9629.2021.06.018 |
| 分类号:U414 |
| 基金项目:湖南省重点领域研发计划项目（2019GK2244）；湖南省科技创新计划资助（2020RC4049）；湖南省交通运输科技进步与创新计划项目（201731） |
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| Low Temperature Performance Evaluation and Mechanism Analysis of Wood Tar-Based Rejuvenated Asphalt |
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LIU Chonglin1, JIANG Kang2, WU Chaofan3, LIU Kefei1
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1.Institute of Southern Green Road， Central South University of Forestry and Technology， Changsha 410004， China;2.Hunan Communications Research Institute Co.， Ltd.， Changsha 410015， China;3.Hunan Provincial Engineering Research Center for Construction Solid Wastes Recycling， Changsha 410205， China
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| Abstract: |
| To explore the low-temperature cracking resistance of wood tar-based rejuvenated asphalt， the low-temperature cracking resistance and its mechanism of base asphalt， wood tar-based rejuvenated asphalt and RA-102 rejuvenated asphalt were tested and compared . The correlation between performance indexes and low-temperature cracking resistance of asphalt was evaluated by grey relational degree analysis. Research results show that the addition of rejuvenator can effectively restore the low-temperature deformation ability and stress relaxation ability of the aged asphalt， and resist the adverse effects of low temperature on the aged asphalt to a large extent， but it is difficult to completely recover to the level of original asphalt. Wood tar-based rejuvenator can significantly decrease the brittleness and crystallinity of the aged asphalt， inhibit the crystallization of asphalt at low temperature and improve the flexibility of the molecular chain， thus improving the stress relaxation effect and increasing the ductility. Wood tar-based rejuvenator can blend the components of aged asphalt and adjust its colloidal structure， effectively improve the concentration of asphalt relative molecular mass， weaken the intermolecular force， and reduce the relative content of macromolecular substances. The correlation degree between various performance parameters of rejuvenated asphalt and its low-temperature performance is quite different. In the future， a multi-parameter comprehensive evaluation system and index between the type and performance of rejuvenator， the ratio of rejuvenated asphalt and the recovery of low-temperature performance of rejuvenated asphalt should be established to realize the directional control of low-temperature crack resistance of different rejuvenated asphalt. |
| Key words: wood tar-based rejuvenated asphalt low-temperature cracking resistance biomass material component analysis infrared spectrum |
