基于延度的寒冷地区沥青再生剂的靶向研制与性能分析

Targeting Development and Performance Analysis of Rejuvenating Agent in Cold Areas Based on Rejuvenated Asphalt Ductility

沥青路面再生技术已取得丰硕的研究成果,但再生沥青混合料的低温性能仍不理想,对寒冷地区,这一问题更加突出。本文针对寒冷地区老化沥青的性能特点与再生需求,使用呼伦贝尔地区提供的回收沥青混合料(RAP)作为老化沥青来源,进行了适用于寒冷地区的沥青再生剂靶向研制。首先通过对老化沥青的组分和性能分析,结合再生剂的研制目标,选择了四种再生剂原材料;然后基于10℃延度,通过正交试验确定了再生剂的最佳配方为基础油A:增塑剂B:添加剂C:石油树脂D = 100:30:3:1。在此研究的基础上,建立了沥青老化时长与10℃延度的函数关系,以及再生沥青延度与再生剂中增塑剂B含量的函数关系。研究结果表明:研制的寒冷地区沥青再生剂对老化沥青再生效果好,特别是低温性能显著提升,再生沥青的10℃延度比原基质沥青还要优越;根据沥青的不同老化程度以及再生沥青的目标延度,可精准调控再生剂中增塑剂B的含量,靶向精准设计再生剂配方,在保证再生沥青性能的基础上,达到降低生产成本的目的。

Asphalt pavement recycling technology has achieved fruitful research results, but the low-temperature performance of recycled asphalt mixture is still not ideal. This problem is even more prominent in cold regions. Aiming at the performance characteristics and regeneration needs of aging asphalt in cold areas, this paper uses recycled asphalt mixture (RAP) provided by Hulun Buir as the source of aging asphalt and conducts targeted development of asphalt rejuvenating agent suitable for cold areas. First, through the analysis of the components and performance of the aging asphalt, combined with the development goals of the rejuvenating agent, four rejuvenating agent raw materials were selected;then based on the 10˚C ductility, the optimal formulation of the rejuvenating agent was determined as the base oil through orthogonal experiments. A: Plasticizer B: Additive C: Petroleum resin D = 100:30:3:1. On the basis of this research, the relationship between the aging time of asphalt and the ductility at 10˚C was established, and the relationship between the ductility of the rejuvenated asphalt and the content of plasticizer B in the rejuvenating agent was established. The research results show that the developed asphalt rejuvenating agent in cold areas has a good regeneration effect on aging asphalt;especially the low-temperature performance is significantly improved. The 10˚C ductility of the rejuvenated asphalt is superior to that of the original matrix asphalt;according to the different aging degrees of asphalt and the target extension of rejuvenated asphalt, the content of plasticizer B in the rejuvenated asphalt can be accurately controlled, and the formula of the rejuvenated asphalt can be designed precisely to reduce the production cost on the basis of ensuring the performance of rejuvenated asphalt.