【摘要】 为了确定不同老化程度下的一种90号道路石油沥青对温度敏感度的变化,以及评价不同老化程度下沥青的流变力学性能,借助剪切模量、劲度模量和车辙因子等流变性能指标,通过弯曲蠕变劲度试验(BBR)与流变性质试验(DSR)法,利用沥青路面表面温度模型,得到了沥青在不同老化程度下的流变力学性能变化与沥青适用性指标。研究结果表明,沥青老化会提高沥青车辙因子对温度的敏感程度,影响程度在52.87%左右;沥青老化会降低沥青弯曲蠕变劲度对温度的敏感程度,短期老化与压力老化的影响程度分别为5%和21%;沥青的老化使得沥青的蠕变曲线斜率m平均下降8.21%。更多还原

【Abstract】 In order to determine the change of temperature sensitivity of a No.90 th Road oil asphalt under different aging levels,and to evaluate the rheological mechanical properties of asphalt under different aging levels,by means of rheological performance indexes such as shear modulus,stiffness modulus and rutting factor,the change of rheological mechanical properties and asphalt applicability index of asphalt under different aging degree were obtained by using the surface temperature model of asphalt pavement by bending creep stiffness test(BBR)and rheological property test(DSR)method.The results show that the aging of asphalt will improve the sensitivity of asphalt rutting factor to temperature,the influence degree is about 52.87%,the aging of asphalt will reduce the sensitivity of asphalt bending creep stiffness to temperature,and the influence degree of short-term aging and pressure aging is 5% and 21%,respectively.The aging of asphalt makes the creep curve slope m of asphalt decrease by 8.21% on average.更多还原