基于AMPT及数学模型探究再生沥青混合料的高温性能OA

The stability of asphalt mixtures at high temperatures is a critical factor affecting their service life.It is of great importance to investigate the effects of various factors on the high-temperature performance of composite recycled asphalt mixtures with a high content of reclaimed asphalt pavement materials(RAP).In the study,atomic force microscopy(AFM)was employed to determine the optimal dosage of the rejuvenator(XT-3).Dynamic modulus(|E*|)tests were conducted to examine the influence of different RAP contents,temperatures,loading frequencies,and fiber types on the high-temperature performance of high-RAP-content composite recycled asphalt mixtures.The results indicated that when the mass fraction of XT-3 was 7.0%,the microscopic adhesion force reached its maximum value of 8.482 mN,representing an increase of 775%,and the rejuvenation effect was optimal.Under the same RAP content and loading frequency conditions,the|E*|gradually decreased with increasing temperature.Under the same temperature and loading frequency conditions,the|E*|first increased and then decreased with increasing RAP content.Under the same temperature and RAP content conditions,the|E*|of the recycled asphalt mixtures decreased with decreasing loading frequency,and the incorporation of fibers effectively enhanced the high-temperature performance of the asphalt mixtures.By combining analysis of variance,the entropy weight-grey relational analysis method,and the random forest model,the effects of temperature,RAP content,loading frequency,and fiber type on|E*|were investigated from three mathematical frameworks,among which temperature was found to have the most significant influence.