短期老化对桥梁无缝伸缩缝沥青胶结料的影响

摘要

通过薄膜烘箱老化试验(TFOT)模拟无缝伸缩缝沥青胶结料的高温短期老化过程，分析老化后沥青胶结料的质量损失、弹性回复率以及流变性能。试验结果表明高温老化导致沥青胶结料中轻组分挥发，低温弹性回复下降，高低温复合模量增加，但相位角变化较小，车辙因子和疲劳因子大体呈增趋势。短期老化后沥青胶结料仍表现出很好的粘弹性，有利于保持其使用性能。%This paper investigates the effects of short-term aging on asphalt binders of asphalt plug joints by using thin film oven test (TFOT).Tests on mass loss,elastic recovery and rheological properties were carried out.Test re-sults indicated that light ingredients were volatilized during aging process.Aging resulted in decreased elasticity,in-creased complex modulus and a small change of phase angle.Rutting and fatigue parameters tended to increase after aging.Asphalt binders still showed good viscoelastic properties,which is helpful for the service performance.