| 摘要: |
| 通过室内试验模拟沥青混合料的多次再生过程，探讨了多次再生沥青的物理性质变化特征和组分迁移规律；通过马歇尔试验确定多次再生沥青混合料的配合比，利用单轴贯入强度试验、半圆弯拉试验和冻融劈裂试验对其使用性能进行了评价，并通过沥青混合料性能试验仪（AMPT）分析了其相位角在温度和加载频率同步耦合作用下的变化规律.结果表明：沥青经历多次再生后流变性能变差，高温性能提升，低温性能衰减显著；再生剂在旧沥青中的增溶作用随着其掺量的提高而增强，随着再生次数的增加呈指数规律衰减；再生沥青混合料的高温稳定性随再生次数增加呈对数规律增长，水稳定性对再生次数的敏感度较低，3次再生后其马歇尔体积指标均可满足规范要求；1次再生沥青混合料的动态黏弹特性与全新料较为接近，2次再生后，其弹性效应增强，低温抗裂性能劣化加速.综上所述，沥青混合料经多次再生后，应重点关注其低温性能的恢复情况. |
| 关键词: 沥青混合料 多次再生 组分分析 断裂能 动态黏弹特性 |
| DOI：103969/j.issn.1007 9629202001012 |
| 分类号: |
| 基金项目:“十三五”国家重点研发计划项目（2018YFB1600100）；中央级公益性科研院所基本科研业务费专项资金项目（2018 9008） |
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| Asphalt Component Migration and Mixture Properties for Multiply Recycled Asphalt Mixture |
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WANG Jie, QIN Yongchun, ZENG Wei, XU Jian, HUANG Songchang
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Key Laboratory of Road Structure & Materials TransportationBeijing, Research Institute of Highway Ministry of Transport, Beijing 100088, China
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| Abstract: |
| Multiply recycling process for asphalt mixture was simulated by laboratory test, then the physical properties and component content of multiply recycled asphalt were investigated. The mix design of recycled asphalt mixture was determined by Marshall test, and the properties were evaluated by uniaxial penetration strength test, semi circular bending test and freeze thaw test. And the phase angle variation of recycled mixture under the synchronous coupling of temperature and loading frequency was analyzed by asphalt mixture performance tester(AMPT). The results show that after multiply recycling of asphalt, the rheological property changes adversely, high temperature property improves and low temperature property change much adversely. The compatibilization of rejuvenating agent in the aged asphalt enhances as its content increases, and decreases exponentially as recycling cycle increases. The rutting resistance of recycled mixture enhances logarithmically as recycling cycle increases, and the moisture susceptibility is less sensitive to recycling cycle, after the third recycling for asphalt mixture, the Marshall volume parameters can meet the specification requirements. The viscoelastic property of recycled mixture for first cycle is similar to virgin mixture, after the second recycling, the elastic effect is enhanced, and the low temperature anti cracking property reduces significantly. In summary, the multiply recycling for asphalt mixture should focus on its low temperature anti cracking resistance. |
| Key words: asphalt mixture multiply recycling component analysis fracture energy dynamic visco elastic property |
