不同降黏剂对温拌超薄磨耗层性能影响

Effect of Warm Mix Additives on the Performance of Hot Mix Ultra-thin Friction Eourse

超薄磨耗层是公路预防性养护最有效的技术手段之一,热拌超薄磨耗层混合料由于生产施工温度较高,不仅会造成资源浪费,还会使混合料老化严重、性能下降。通过在高黏沥青中添加降黏剂可有效降低沥青高温条件下的黏度,从而降低拌和温度。研究表明,Sasobit、聚乙烯蜡和SZ能有效降低沥青的黏度,以1000 m Pa·s为基准黏度情况下能降低拌和温度约15℃,磨耗层混合料性能测试结果表明添加Sasobit和聚乙烯蜡可提升沥青混合料的高温稳定性,然而马歇尔稳定度、水稳定性和抗松散性能有所降低。而国产SZ降黏剂不仅能提升混合料的高温性能,还能提升马歇尔稳定度和抗水损害性能,是一种高性能降黏剂。

Hot mix ultra-thin friction course is one of the most effective technical means on highway preventive maintenance.Due to the high mixing and paving temperature of hot mix ultra-thin friction course,it will not only cause waste of energy resources,but also cause serious aging of mixture,resulting in performance degradation.Warm mix additives can effectively decrease the viscosity of high-viscosity asphalt,so as to decrease the mixing and paving temperature.The research shows that the Sasobit,PE wax and SZ can effectively reduce the viscosity of high-viscosity asphalt.The temperature of high-viscosity asphalt with warm mix additives in the viscosity of 1000 mPa·s is about 15℃lower than that of virgin high-viscosity asphalt.Results of friction course asphalt mixture show that Sasobit and PE wax can enhance the high temperature stability while the Marshall stability,moisture susceptibility and raveling resistance are deteriorated.For SZ additive,performance of high temperature,Marshall stability and moisture susceptibility are all enhanced,indicating a high performance warm mix additive.