为研究生物炭与SBS复合改性对沥青热氧老化性能的影响,利用旋转薄膜加热实验(RTFOT)模拟沥青的短期老化,压力老化实验(PAV)模拟沥青的长期老化。利用针入度、软化点、延度、高低温流变实验的方法研究了基质沥青、生物炭改性沥青、SBS改性沥青和复合改性沥青老化前后的基本性能和高低温性能;并通过红外光谱和荧光显微镜研究了各组沥青老化前后的微观机理。结果表明,生物炭能够提高沥青的高温性能,降低低温性能;SBS改性沥青低温性能最优,复合改性沥青的低温性能仅次于SBS改性沥青;生物炭和SBS复合改性沥青能够显著提高沥青的抗老化性能;生物炭与沥青并没有发生化学反应,只是物理共混。可见,SBS和生物炭的复合对于沥青的热氧老化具有显著的改善作用,效果优于SBS和生物炭单独作用;5%的SBS与7.5%的生物炭为复合改性沥青的最佳掺量。
In order to investigate the impact of biochar and SBS (styrene-butadiene-styrene) composite modification on the thermo-oxidative aging properties of asphalt,the rotating thin film oven test (RTFOT) was employed to simulate short-term aging of asphalt,while the pressure aging vessel (PAV) test was used to simulate long-term aging.Basic and high/low-temperature properties of base asphalt,biochar-modified asphalt,SBS-modified asphalt,and composite-modified asphalt before and after aging were studied through methods including penetration,softening point,ductility,and high/low-temperature rheological tests.Furthermore,infrared spectroscopy and fluorescence microscopy were used to investigate the microscopic mechanisms of each asphalt group before and after aging.The results indicated that biochar could enhance the high-temperature performance of asphalt while compromising its low-temperature performance.SBS-modified asphalt exhibited the best low-temperature performance,followed closely by composite-modified asphalt.The combination of biochar and SBS in asphalt significantly improved the resistance to aging.Biochar and asphalt didn't undergo chemical reactions,rather they existed as a physical blend.It was evident that the composite of SBS and biochar significantly improved the thermo-oxidative aging resistance of asphalt,outperforming the individual effects of SBS and biochar.The optimal dosage for composite-modified asphalt was 5% SBS and 7.5% biochar.
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基金资助
国家自然科学基金青年项目(52208423)
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