基于流变性能的SBS改性沥青老化动力性能研究

Investigation of Aging Kinetics of SBS Modified Asphalt Based on Rheological Properties

应用老化动力学模型,建立了基于复数模量的老化动力学方程。通过对SBS改性沥青和基质沥青的流变性能试验,验证了在沥青材料老化过程当中,复数模量与老化反应的反应物浓度成反比的假设。根据假设求得了基于复数模量的老化动力学常数,并采用实测数据对老化动力学方程进行检验。结果表明:SBS改性沥青具有较高的反应活化能,具有较好的抗老化性能,实测数据能够较好的与理论计算数据吻合,采用复数模量建立老化动力学方程是合理的,并且更能反映沥青在老化过程当中流变学状态的变化。

Through the application of ageing kinetics model,ageing kinetics equation has been established on the basis of complex modulus.Rheological properties test have been carried out on SBS modified asphalt and base asphalt.The results demonstrate that when asphalt material in ageing process,the hypothesis that complex modulus is inversely proportional to the concentration of reactant assumptions of ageing reaction is established,on the basis of which,ageing kinetics constant has been obtained.Ageing kinetics equation has been validated by using measured data,it shows that,SBS modified asphalt owns higher reaction activation energy,a good anti-ageing property as well,that the measured data can keep accordance with calculated data,which demonstrates ageing kinetics equation is established reasonably on the basis of complex modulus.The equation can well describe rheological state changes of asphalt in ageing process.