Evaluation Parameter Research of Asphalt Binder Fatigue
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摘要: 为了确定沥青疲劳性能的评价指标,进行了5种沥青(烯烃类、天然沥青类、硬质沥青类、A-70#沥青和SBS沥青)及沥青混合料的室内疲劳性能试验,采用模量衰减到初始值的50%Nf50、累积耗散能比偏离无损直线20%对应的Np20、累积耗散能和疲劳因子G*sinδ 指标,分析各评价指标对加载模式的依赖性和各评价指标之间的区别与联系.结果表明,疲劳因子G*sinδ和累积耗散能无法明确确定沥青的疲劳寿命,不宜作为高模量沥青结合料的疲劳性能评价指标;在相同加载条件下, Np20约为Nf50的0.725倍,建议采用Nf50评价沥青结合料的疲劳性能.Abstract: In order to determine the evaluation parameter of asphalt binder fatigue performance, fatigue performances of 5 kinds of asphalt binder (including olefin asphalt binder, natural asphalt binder, hard asphalt binder, A70# asphalt, and SBS asphalt)and asphalt mixture were tested in laboratory. Then, 4 evaluation parameters, including fatigue life at 50% initial modulus reduction (Nf50 ), fatigue life at the accumulated dissipation energy ratio deviating 20% from the lossless line (Np20 ), accumulated dissipation energy, and fatigue factor (G*sin δ) were used to analyze the dependence of each evaluation parameter on the loading mode and the relationship between the evaluation parameters. The result shows that the fatigue factor G*sinδ, dissipation energy, and accumulated dissipation energy are inappropriate to be used as evaluation parameters as they cannot determine the fatigue life exactly. The other two parameters, Nf50 and Np20 , however, are suitable to evaluate the binders fatigue performance. Np20 is about 0.725 times Nf50, and it is suggested using Nf50 to evaluate the fatigue performance of asphalt binders.
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