Effect of Polyethylene and Sulfur on Agti-aging Performance of Asphalt
[Purposes]In order to study the influence of polyethylene and sulfur on the agti-aging perfor-mance of asphalt.[Methods]Polyethylene modified asphalt and sulfur modified asphalt with different modifier contents were prepared,and the rotating film heating aging test and pressure aging test were car-ried out for different asphalt.The penetration,softening point,and ductility of different asphalt before and after aging were tested,and the penetration and ductility aging index and softening point difference before and after aging were analyzed.The influence mechanism of polyethylene and sulfur on asphalt ag-ing resistance was explored by analyzing the functional groups in asphalt by infrared spectrum test.[Findings]The results show that under the same aging conditions,with the increase of polyethylene or sulfur content,the penetration aging index and elongation aging index of modified asphalt gradually in-crease,and the softening point difference gradually decrease,and the performance difference before and after aging decrease.The modification of asphalt by polyethylene and sulfur is mainly based on physical modification.Compared to the original matrix asphalt,the carbonyl index and sulfoxide index of modified asphalt decrease.[Conclusions]Polyethylene and sulfur can increase the antioxidant aging performance of asphalt.
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