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- 2018
老化对改性沥青微观结构及疲劳性能的影响
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Abstract:
为了研究老化对改性沥青微观结构及疲劳性能的影响，通过沥青常规指标测试试验、动态剪切流变（DSR）试验和AFM测试试验，从宏细观角度分析了老化前后苯乙烯-丁二烯-苯乙烯三嵌段共聚物（SBS）改性沥青和胶粉改性沥青的针入度、延度和软化点及疲劳性能、微观结构的变化情况。结果表明：随着老化程度的加深，两种改性沥青的稠度、硬度增加，高温性能得到改善，而温度敏感性变低，低温抗裂性能变差。综合分析针入度比、延度比和软化点比得出胶粉改性沥青的抗老化性能优于SBS改性沥青；随温度的降低、频率的增大和老化程度的加深，两种改性沥青的抗疲劳性能变差；微观结构观测结果显示，SBS改性沥青具有"蜂型结构"，老化后"蜂型结构"的体积增大、高度增加、数量减少；胶粉改性沥青没有"蜂型结构"，胶粉颗粒与沥青在共混共融过程中发生溶胀、脱硫和降解等行为会影响沥青中"蜂型结构"的形成；老化前后胶粉改性沥青表面形貌粗糙度和高度变化不大；胶粉改性沥青的抗疲劳、抗老化和高温性能总体优于SBS改性沥青。 In order to study the effect of aging on microstructure and fatigue properties of modified asphalt, the asphalt routine index test, the Dynamic Shear Rheometer(DSR) test and the AFM test were used to analyse penetration, ductility, softening point, fatigue performance and microstructure of styrene-butadiene-styrene tri-block copolymer(SBS) modified asphalt and rubber powder modified asphalt from the macro and micro perspective before and after aging.The results show that with the deepening of aging, the hardness of modified asphalt increases and the high temperature performance also improves, whlie the temperature sensitivity becomes lower and the low temperature crack resistance becomes worse. The anti-aging properties of rubber modified asphalt are better than that of SBS modified asphalt according to the comprehensive analysis of penetration ratio, ductility ratio and softening point ratio.With the decrease of temperature, the increase of frequency and the deepening of aging, the anti-fatigue performance of two modified asphalt is deteriorated. The microstructure observation results show that SBS modified asphalt has "bee-like structure" and the volume and height of "bee-like structure" increase after aging, but their numbers decrease.There is no "bee-like structure" in the rubber powder modified asphalt, it is due to some reactions like swelling, desulfurization and degradation occured in the blending process of asphalt and rubber powder that restricted the "bee-like structure" formation, and few changes occur in the roughness and the height of rubber powder modified asphalt surface after aging. Rubber powder modified asphalt has better fatigue resistance, aging resistance and high temperature performance than that of SBS modified asphalt. 国家自然科学基金（51568054）；道路结构与材料交通行业重点实验室（北京）开放基金课题
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