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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 dynamic shear rheometer (DSR) was used to measure the complex shear modulus G *, phase angle δ and other rheological properties of matrix asphalt and its warm mix asphalt at medium temperature of 16 ~ 40 ℃, then the fatigue was established The results show that the complex shear modulus G * decreases with increasing temperature, while the phase angle δ increases with increasing temperature. The higher the content of warm mix, the larger the complex shear modulus G *, the smaller the phase angle. The fatigue factor G * sinδ decreases exponentially with increasing temperature, and increases linearly with the increase of temperature At lower temperature and higher dosage, the change of fatigue factor is more significant. The smaller the complex modulus of matrix asphalt, the more influence the warm mix agent has on the rheological properties of warm mix asphalt, and the effect of aging on the properties of matrix asphalt Higher than the impact of asphalt - warm agent interaction; the higher content of warm mix asphalt binder, the more easily fatigue cracking.