PE改性沥青多尺度流变性能

Multiscale Rheological Properties of PE Modified Asphalt

为评价PE(聚乙烯Polyethylene,简写PE)改性沥青流变性能及不同流变指标之间相关性,基于不同PE改性剂掺量下的动态剪切流变试验和多应力蠕变恢复试验,以车辙因子、Shenoy参数、低剪切黏度、不可恢复蠕变柔量和蠕变恢复率作为PE改性沥青流变性能多尺度评价指标,分析不同流变指标相关性;以老化指数和Cole-Cole图评价PE改性剂对沥青耐老化性能和黏弹性的影响.结果表明,随着PE改性剂掺量增加,车辙因子、低剪切黏度、Shenoy参数和蠕变恢复率逐渐增加,且后三者与车辙因子呈正相关;不可恢复蠕变柔量逐渐降低,且与车辙因子呈非线性负相关.车辙因子与其余流变参数相关系数均在90%以上.PE改性沥青耐老化性能及弹性提高.PE改性剂掺量大于6%时,流变指标及老化指数受改性剂掺量影响幅度降低.

To evaluate the rheological properties of PE(Polyethylene)modified asphalt and the correlation between different rheological indicators,dynamic shear rheological tests and multi stress creep recovery tests were conducted under different PE modifier dosages.The multiscale evaluation indicators of the rheological properties of PE modified asphalt were rutting factor.By using Shenoy parameter,low shear viscosity,irrepara-ble creep flexibility,and creep recovery rate as the evaluation index,the correlation between different rheological indicators was analyzed.The effect of PE modifier on the aging resistance and viscoelasticity of asphalt was eval-uated by aging index and Cole-Cole plot.The results show that as the content of PE modifier increases,the rut-ting factor,low shear viscosity,Shenoy parameter,and creep recovery rate gradually increase,and the latter three are positively correlated with the rutting factor.The irrecoverable creep compliance gradually decreases and is non-linear and negatively correlated with the rutting factor.The correlation coefficient between the rut-ting factor and other rheological parameters is above 90%.PE modified asphalt has improved aging resistance and elasticity.When the dosage of the PE modifier is greater than 6%,the rheological index and aging index decrease significantly due to the influence of the modifier dosage.