多尺度纳米材料对再生沥青长期老化性能的影响

发布时间：2019-01-03 16:34

【摘要】：研究了由不同掺量有机蛭石(OEVMT)和纳米氧化锌(Nano-ZnO)组成的多尺度纳米材料对再生沥青长期热氧和光氧老化性能的影响。利用薄膜烘箱对普通基质沥青进行老化以制得老化沥青,采用熔融共混方法,先将老化沥青、普通基质沥青以及再生剂按照一定的比例混合以制得再生沥青,再将多尺度纳米材料加入到再生沥青中制得多尺度纳米材料改性再生沥青。采用压力老化箱老化(PAV)和加速紫外光老化(UV)分别模拟再生沥青的长期热氧老化和光氧老化条件。通过传统物理性能试验和动态剪切流变试验评价了再生沥青的老化性能。结果表明:添加多尺度纳米材料提高了再生沥青老化前的高温稳定性、剪切变形抵抗力和弹性行为,但一定程度上削弱了其低温塑性变形能力;多尺度纳米材料有效改善了再生沥青长期热氧和光氧老化抵抗力;综合考虑长期老化性能数据,多尺度纳米材料的推荐掺量(质量分数)为1%OEVMT+3%Nano-ZnO。
[Abstract]:The effects of multi-scale nano-materials composed of organic vermiculite (OEVMT) and nano-zinc oxide (Nano-ZnO) on the long-term thermal and photo-oxygen aging properties of recycled asphalt were studied. The aging asphalt was prepared by using the film oven to aging the common base asphalt. The asphalt was prepared by melt blending, and the aging asphalt, the ordinary base asphalt and the regenerating agent were mixed in a certain proportion to produce the recycled asphalt. Then the multi-scale nano-materials were added to the recycled asphalt to prepare the multi-scale nano-materials modified recycled asphalt. The aging conditions of regenerated asphalt were simulated by aging (PAV) in pressure aging chamber and accelerated UV aging (UV), respectively. The aging performance of recycled asphalt was evaluated by traditional physical property test and dynamic shear rheological test. The results show that the addition of multi-scale nano-materials can improve the high temperature stability, shear deformation resistance and elastic behavior of recycled asphalt before aging, but weaken its low temperature plastic deformation ability to some extent. Multi-scale nano-materials can effectively improve the resistance of regenerated asphalt to long-term thermal oxygen and photo-oxygen aging, and considering the long-term aging performance data, the recommended content (mass fraction) of multi-scale nano-materials is 1%OEVMT _ 3Nano-ZnO.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金项目(51308203) 湖南省自然科学基金项目(2017JJ3015) 湖南省交通科技进步与创新计划项目(201307) 湖南省科技计划重点项目(2015SK2063-1)
【分类号】：U414

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