氙灯加速老化对沥青混合料性能的影响

为考察沥青混合料的性能受光照的影响,对三种级配类型及四种沥青的沥青混合料进行氙灯加速老化试验.用马歇尔稳定度和流值、紫外光老化前后马歇尔稳定度和流值的变化分别评价沥青混合料的高温稳定性和抗紫外光老化能力.结果表明木质素纤维能够有效改善沥青混合料的高温稳定性及抗紫外光老化性能.不同级配类型的沥青混合料的高温稳定性和抗紫外光老化性能各有差异:密级配受影响程度最小,半开级配次之,开级配最差.这些特点可以为沥青混合料紫外光老化的研究提供有益的参考,也为紫外线辐射强烈的西部地区沥青混合料的评价与选择提供依据.

Effect of Xenon Lamp Accelerated Aging on the Performance of Asphalt Concrete

Asphalt concretes with three gradation types and four kinds of asphalts are aged with the xenon lamp to study the performance of modified asphalt exposed to sunlight.Marshall stability and flow value and the change are used to evaluate respectively the high temperature stability and anti-ultraviolet aging ability.The results show that lignin fiber can improve high temperature stability and anti-ultraviolet aging ability of asphalt concretes.High temperature stability and anti-ultraviolet aging ability of asphalt concretes with different gradation types is different.High temperature stability and ultraviolet light resistance aging performance of different gradation types of asphalt mixture have differences:influence of dense gradation is the smallest,half-open gradation is the second smallest,and open gradation the worst.These features can provide helpful reference for asphalt mixture ultraviolet aging research,and provide the evaluation and selectionof the asphalt mixture in the western region of ultraviolet radiation.