| 摘要: |
| 为了探究热老化对沥青与胶粉之间相容性的影响，采用压力老化法（PAV）制备长期老化沥青.采用四组分分析法对基质沥青与老化沥青进行分析，并在此基础上，以丁苯橡胶（SBR）作为胶粉的代表建立分子模型.结果表明：老化前后沥青的密度没有明显变化，但是老化沥青的能量由于老化后沥青中大分子比例的增加而增加；老化沥青与SBR溶解度系数差值较基质沥青与SBR溶解度系数差值更大，表明老化降低了沥青与SBR之间的相互溶解能力；老化使沥青与SBR之间的相互作用能下降，最终降低了沥青与SBR的相容性. |
| 关键词: 分子动力学 老化沥青 胶粉改性沥青 相容性 |
| DOI：103969/j.issn.1007 9629201903021 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（11762012）；内蒙古交通科技项目（NJ 2015 1） |
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| Molecular Dynamics Study on Compatibility of Asphalt and Rubber Powders before and after Aging |
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WANG Lan, ZHANG Le, LIU Yang
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School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
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| Abstract: |
| In order to investigate the effect of heat aging on the compatibility between asphalt and rubber powder, the long term aging asphalt was prepared by pressure aging vessel(PAV) accelerated aging test method, four component analysis was carried out on the matrix asphalt and the aging asphalt. Based on above experimental results, the rubber powder representative molecular model was established using styrene butadiene rubber(SBR) molecular model. The results show that the density of asphalt does not change significantly before and after aging, but the energy increases due to the increase of macromolecule ratio in asphalt after aging. The difference between the solubility parameter of aging asphalt and SBR is larger than the difference of solubility parameter between matrix asphalt and SBR. Indicating that aging reduces the mutual dissolution ability and the interaction energy between asphalt and SBR, ultimately reduces the compatibility between the asphalt and the SBR. |
| Key words: molecular dynamics aging asphalt rubber powder modified asphalt compatibility |
