| 崔亚楠,于庆年,韩吉伟,陈超.复杂气候条件下胶粉改性沥青的低温性能[J].材料导报,2018,32(12):2078-2084 |
| 复杂气候条件下胶粉改性沥青的低温性能 |
| Low Temperature Performance of Rubber-modified Asphalt Under Complex Climate |
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| DOI：10.11896/j.issn.1005-023X.2018.12.026 |
| 中文关键词: 盐冻循环 热老化 胶粉改性沥青 低温流变性能 原子力显微镜 |
| 英文关键词: salt freezing cycle, thermal aging, rubber modified asphalt, low temperature rheological property, atomic force microscopy |
| 基金项目:国家自然科学基金 (11162010；51568054) |
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| 中文摘要: |
| 我国北方地区夏季高温炎热,冬季寒冷冰冻。沥青路面在施工和使用的过程中,高温易导致老化,低温易发生冻融循环,都会对沥青的性能产生影响。本研究分别对基质沥青和胶粉改性沥青进行短期、长期热老化试验和盐冻循环试验,并对环境影响后的基质沥青和胶粉改性沥青进行弯曲梁流变试验(Bending beam rheometer,BBR),通过弯曲蠕变劲度S和蠕变速率m对比其低温性能的变化规律。同时对不同环境影响后的两种沥青进行原子力显微镜(AFM)观测,比较两种沥青微细观结构的变化情况。结果表明:基质沥青和胶粉改性沥青的低温抗裂性能和抗变形能力受热老化影响严重,季节性冰冻区沥青路面铺设和使用时要注意热老化的控制和预防,从而保证道路的使用寿命；与基质沥青相比,胶粉改性沥青盐冻循环和热老化后的抗变形能力和低温柔性得到改善,其更适合北方寒冷地区使用。 |
| 英文摘要: |
| In northern China, the summer is hot and winter is cold. Asphalt pavement is prone to thermal aging easily at high temperature, and suffers freeze-thaw cycles at low temperature, which will affect the performance of asphalt. The short-term and long-term thermal aging test and freeze-thaw cycle test were carried out in this work upon the matrix asphalt and crumb-rubber-modified asphalt to simulate environmental impact, and subsequently the bending beam rheometer was employed to measure the asphalts’ bending creep stiffness S and creep rates m. We analyzed the changes of low temperature performances of these two kinds of asphalts which had experienced different salt freezing cycle times and different thermal aging modes, and moreover, observed their microstructure variations by an atomic force microscope (AFM). It can be concluded that thermal aging exerts serious influences on the low temperature anti-cracking performances and anti-deformation performances of both the matrix asphalt and rubber-modified asphalt. Therefore, it is of great importance to prevent and control thermal aging of asphalt pavement in seasonal frozen are in order to ensure the road service life. Compared with matrix asphalt, the crumb-rubber-modified asphalt exhibited a relatively better low temperature performance, including flexibility and deformation resistance, after salt freezing cycles and thermal aging, and displayed a more favorable compatibility in northern cold regions. |
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