When heavy vehicles load at high temperatures, the mechanical responses of asphalt binders are probable in the nonlinear viscoelastic regions. However, the nonlinear viscoelasticity of asphalts at above ambient temperatures is seldom studied. In this paper, large amplitude oscillatory shear was used to characterize the nonlinear rheological behaviors of three typical asphalt binders including base asphalt (BA), thermoplastic styrene–butadiene–styrene modified asphalt (SBA) and thermosetting epoxy asphalt (EA) at temperatures of 25, 45, 65, 85, 100 °C, respectively. The inter-cycle yielding behaviors of BA, SBA and EA were observed by strain sweep tests at relatively low temperatures. And the strong intra-cycle yielding and intra-cycle stiffening behaviors were detected for EA at 25 °C, while slight intra-cycle yielding behaviors were observed for BA and SBA through the shape of Lissajous curves. With temperature increasing, nonlinear responses of the three asphalt binders gradually disappear at different rates, which were validated by strain stiffening index S. To some extent, the strain and temperature dependence of nonlinear behaviors displayed in Lissajous curves can be manifested in strain sweep tests. The dissipation ratio φ indicates that with the increase of temperature BA and SBA gradually transform from viscoelastic solids eventually to Newtonian fluids at 100 °C, while EA nearly behaves purely elastic at 100 °C originated from the crosslinking networks. These results could be responsible for the differences of nonlinear characteristics and practical performances among the three kinds of binders.

当重型车辆在高温下装载时，沥青粘合剂的机械响应可能在非线性粘弹性区域中。然而，很少研究沥青在高于环境温度下的非线性粘弹性。在本文中，使用大振幅振荡剪切来表征三种典型的沥青粘合剂的非线性流变行为，包括基础沥青（BA），热塑性苯乙烯-丁二烯-苯乙烯改性沥青（SBA）和热固性环氧沥青（EA）在25°C的温度下，分别为45、65、85、100°C。在相对较低的温度下通过应变扫描测试观察到了BA，SBA和EA的循环间屈服行为。并且在25°C下检测到EA具有很强的周期内屈服和周期内硬化行为，而通过Lissajous曲线的形状观察到BA和SBA有轻微的周期内屈服行为。随着温度的升高，三种沥青粘合剂的非线性响应以不同的速率逐渐消失，这已通过应变硬化指数得到了验证。小号。在某种程度上，李沙育曲线中显示的非线性行为的应变和温度相关性可以在应变扫描测试中得到体现。耗散率φ表明，随着温度的升高，BA和SBA在100°C时逐渐从粘弹性固体最终转变为牛顿流体，而EA在100°C时几乎表现出纯粹的弹性，这源于交联网络。这些结果可能是三种粘合剂之间非线性特性和实际性能差异的原因。