Chen Zining, Liu Boying, Feng Decheng, Li Gang
China Road and Bridge Corporation, Beijing 100011, China.
China Communications Construction Company, Beijing 100120, China.
Materials (Basel). 2023 Jul 27;16(15):5280. doi: 10.3390/ma16155280.
Generally, the dynamic modulus and bending stiffness modulus are used to evaluate the mechanical properties of asphalt mixture, and they are also used as basic parameters for asphalt mixture design. Therefore, a study was conducted on changes in the dynamic modulus and bending stiffness modulus of hot-recycled asphalt mixture with high levels of reclaimed asphalt pavement (RAP) under the influence of different factors: dosage of regenerant, curing temperature, and curing time. The performance of reclaimed asphalt pavement (RAP) was first evaluated. Then, the hot-recycled asphalt mixture was adjusted and designed in order to conduct modulus experiments, composed of the dynamic modulus test and three-point bending test. Finally, the influencing factors were not only qualitatively but also quantitatively analyzed to clarify the change laws of the mechanical parameters of hot-recycled asphalt mixture. The results showed that the modulus of the recycled asphalt mixture first decreased, then increased, and then decreased with increasing dosage of regenerant. As the curing time or temperature increased, the modulus first decreased and then increased. In terms of the dynamic modulus of the hot-recycled asphalt mixture, the curing time had the greatest impact, followed by dosage of the regenerant and curing temperature. For bending stiffness modulus, the influence of dosage of the regenerant was the greatest, followed by curing time and curing temperature. For the bending stiffness modulus of hot-recycled asphalt mixture, the curing conditions had a greater influence compared with the dynamic modulus.
一般来说，动模量和弯曲劲度模量用于评估沥青混合料的力学性能，它们也用作沥青混合料设计的基本参数。因此，针对不同因素（再生剂用量、养护温度和养护时间）影响下高比例旧沥青路面（RAP）热再生沥青混合料的动模量和弯曲劲度模量变化开展了一项研究。首先对旧沥青路面（RAP）的性能进行了评估。然后，对热再生沥青混合料进行调整和设计，以便开展模量试验，包括动模量试验和三点弯曲试验。最后，不仅对影响因素进行了定性分析，还进行了定量分析，以阐明热再生沥青混合料力学参数的变化规律。结果表明，随着再生剂用量的增加，再生沥青混合料的模量先降低，然后升高，随后又降低。随着养护时间或温度的增加，模量先降低后升高。就热再生沥青混合料的动模量而言，养护时间的影响最大，其次是再生剂用量和养护温度。对于弯曲劲度模量，再生剂用量的影响最大，其次是养护时间和养护温度。对于热再生沥青混合料的弯曲劲度模量，与动模量相比，养护条件的影响更大。
