SBS改性沥青的复合老化机理

Composite Aging Mechanism of SBS Modified Asphalt

摘要:

通过考察沥青的纳米微观形貌、化学官能团和宏观力学指标,研究了复合老化条件下苯乙烯丁二烯苯乙烯嵌段共聚物(SBS)改性沥青的老化规律和机理.结果表明：复合紫外（UV）老化对SBS改性沥青的影响远大于短期老化,且复合UV老化对低温性能的影响更大；复合老化引起沥青“蜂形结构”数目和面积发生改变，复合老化后SBS改性沥青微观表面的杨氏模量和黏附力发生显著变化；复合老化后SBS改性沥青红外光谱中966、1376、1601cm-1处的基团发生了明显变化.

Abstract:

The aging rules and mechanism of styrene butadiene styrene block copolymer(SBS) modified asphalt under composite aging were studied by investigating the nano microscopic morphology, chemical functional groups and macro mechanical indexes of asphalt. The results show that composite ultraviolet(UV) aging has a much greater impact on SBS modified asphalt than thermal aging, and composite UV aging has a greater impact on low temperature performance, and the aging index is used as an evaluation index of asphalt aging; the number and area of asphalt “bee shaped structures” change due to aging. After composite aging, the Youngs modulus and adhesion of the microscopic surface of SBS modified asphalt changed significantly. In the infrared spectra of composite aged SBS modified asphalt, the groups at 966cm-1, 1376cm-1, and 1601cm-1 change significantly.