基于旋转压实技术的RAP力学特性分析

Analysis of Mechanical Properties of RAP Based on Rotary Compaction Technique

沥青路面的养护翻修会产生大量的废旧沥青混合料(reclaimed asphalt pavement, RAP)。对RAP的性能进行科学、准确评价是提高热再生沥青混合料中RAP掺量,改善热再生沥青混合料性能的前提。基于旋转压实技术,通过调整压实速度与压实温度,研究五种不同废旧沥青混合料在旋转压实过程中的受力状态(应力、应变、压实功与工作性),分析不同压实速度与压实温度对RAP力学特性的影响。结果表明,温度升高可以提高RAP的工作性,有利于RAP的压实;在相同温度下,当压实速度为1.5 mm/s时,RAP的工作性最好,更易于压实。

The maintenance and refurbishment of asphalt pavement will generate a huge amount of reclaimed asphalt pavement (RAP). Scientific and accu-rate evaluation of RAP performance is the premise to increase the content of rap in hot recycled asphalt mixture and improve the performance of hot recycled asphalt mixture. Based on the rotary compaction technology, the mechanical properties (stress, strain, compaction work and workability) of five different RAPs in the process of rotary compaction were studied by adjusting the parameters of compaction speed and compaction temperature. The effects of different compaction speed and compaction temperature on the mechanical properties of RAP were analyzed. Results show that the workability of RAP can be enhanced by increasing compaction temperature, which is helpful for the compaction of RAP. When the temperature is the same, the workability of RAP is the best at the compaction rate of 1.5 mm/s.