基于DSR试验的WMA沥青结合料中温流变性能分析（英文）

Rheological properties of warm mix asphalt binder by DSR test at medium temperature

采用动态剪切流变仪（DSR）在16-40℃中等温度下测试、分析了基质沥青及其温拌沥青的复数剪切模量G＊、相位角δ等流变性能,进而建立了疲劳因子G＊sinδ与基质沥青性质、试验温度和拌剂掺量的关系模型.结果表明,复数剪切模量G＊随温度升高而减小,而相位角δ随温度升高而增大;温拌剂掺量越高,复数剪切模量G＊越大,相位角越小;疲劳因子G＊sinδ随着温度升高呈指数减少,随温拌剂掺量增加呈线性增大;在较低温度和较高掺量下,疲劳因子的变化幅度更大;基质沥青复数模量越小,温拌剂对温拌沥青流变性能的影响更为显著,而老化对基质沥青性能的影响高于对沥青-温拌剂相互作用的影响;掺量越高的温拌沥青结合料,越容易疲劳开裂。

The rheological properties including the complex modulus G＊ and the phase angle δof matrix and warm mix asphalt （WMA）binders were measured by using the dynamic shear rheometer （DSR ） test at the medium temperature ranging from 16 to 40 ℃,and the relationships between the fatigue factor G＊ sinδand the matrix binder property,WMA additive and test temperature were established.It is found that G＊ decreases with the increasing temperature while δincreases inversely,and G＊ of the asphalt binder with high WMA additive dosage is large,and δis small.G＊sinδexponentially decreases with the increasing temperature and linearly increases with the increase in additive dosage,and the amplitudes of variation are large at low temperatures and high additive dosages.The effect of WMA additive on the rheological property is more remarkable for the matrix asphalt binder with low G＊.Besides,aging has a great effect on the property of matrix asphalt binder,and a slight effect on the interaction between asphalt and additive.The high additive dosage can increase the fatigue cracking potential of the asphalt binder.