基于介电性质的沥青抗疲劳性能试验研究

为了研究不同老化阶段沥青疲劳性能，通过对热、氧、紫外线、水耦合老化前后的90#基质沥青、SBS改性沥青进行线性振幅扫描（LAS）和介电常数测试，从损伤累积和相位角变化两个角度讨论了不同老化阶段沥青疲劳性能变化情况，并分析了基于介电性质的沥青组分与疲劳应变曲线斜率绝对值B、基于损伤的疲劳破坏参数、基于相位角的疲劳破坏参数之间的关联性。结果表明：老化程度越深，沥青疲劳寿命越短，且沥青基于抗疲劳性能的应变敏感性越大；采用基于损伤的疲劳破坏准则所定义的破坏应变和疲劳寿命评价沥青的抗疲劳性能是合理可行的，且与基于相位角的疲劳破坏准则所定义的破坏应变和疲劳寿命的分析结果一致；可见基于介电性质对沥青组分进行划分的方法合理可行，并可与沥青路用性能进行关联，进一步指导沥青改性工艺。

Experimental Study on Fatigue Resistance of Asphalt Based on Dielectric Properties

In order to study the different stages of aging asphalt fatigue performance, based on the heat and oxygen aging, ultraviolet light, and water coupling before and after the 90 # scanning linear amplitude matrix asphalt, SBS modified asphalt (LAS) and dielectric constant test, from two angles of damage accumulation and phase Angle change discussed the change of the different stages of aging asphalt fatigue performance,The relationship between the slope absolute value B of asphalt component and fatigue strain curve based on dielectric properties, fatigue failure parameters based on damage and fatigue failure parameters and based on phase Angle are analyzed. The results show that the longer the aging degree, the shorter the fatigue life of asphalt, and the greater the strain sensitivity of asphalt based on fatigue resistance. The results show that the longer the aging degree, the shorter the fatigue life of asphalt, and the greater the strain sensitivity of asphalt based on fatigue resistance.It is reasonable and feasible to use the failure strain and fatigue life defined by the damage-based fatigue failure criterion to evaluate the anti-fatigue performance of asphalt, and it is consistent with the analysis results of the failure strain and fatigue life defined by the phase Angle fatigue failure criterion.It can be seen that the method to divide asphalt components based on dielectric properties is reasonable and feasible, and can be correlated with asphalt pavement performance to further guide the asphalt modification process.