干掺废旧塑料改性剂CRP的沥青混合料路用性能及机理研究

发布时间：2018-05-18 00:20

  本文选题：CRP改性沥青 + 干法CRP改性沥青混合料　； 参考：《重庆交通大学》2016年硕士论文

【摘要】：废旧塑料改性剂CRP是以废旧塑料为原材料加工制成,其干法改性沥青混合料的拌制是在适当拌合温度下,将CRP改性剂直接掺入到拌和好的混合料中,拌合一定的时间,最后在与矿粉拌合后拌制而成。它的出现不仅可以保证干法改性沥青混合料具备较好的高温稳定性、低温抗裂性和水稳定性等路用性能,还可以在一定程度上解决废旧塑料改性沥青离析严重、储存稳定性差的问题。本文围绕干法CRP在沥青混合料中的熔融状态与分散性以及干法CRP改性沥青混合料的路用性能进行研究,取得的主要研究成果如下:(1)选用A70#沥青、B70#沥青、C70#沥青和韩国SK-70#四种基质沥青,通过针入度、软化点和布式粘度等室内试验对不同掺量CRP改性沥青的性能进行试验测试,结果表明,CRP在不同基质沥青中的分散性不同,即CRP对不同基质沥青的改性效果不同,相比而言,CRP改性韩国SK-70#沥青效果更好。(2)通过CRP干法改性的熔融试验,针对同一种集料(13.2mm+9.5mm石灰岩),对比研究了集料加热温度、CRP粒径、拌合时间对CRP与集料熔融效果的影响,结果表明,CRP基本完全熔融成薄膜状包裹在集料表面所需的最佳集料加热温度为180℃;2.36mm粒径的CRP干法改性沥青混合料的最佳干拌时间为30s,1.18mm、0.6mm、0.3mm粒径的CRP干法改性沥青混合料的最佳干拌时间为20s。(3)通过室内拌制以及试验路现场取料沥青混合料的抽提回收沥青针入度、软化点等常规性能试验,研究了干法CRP在沥青中的分散性以及其改性效果,结果表明,干法CRP能够在沥青中均匀分散,干法CRP对沥青混合料的改性效果显著。(4)通过韩国SK-70#基质沥青、湿法5.5%CRP改性沥青和干法CRP改性沥青混合料(干拌时间20s、5.5%CRP掺量)回收沥青的热重分析(TG)、DSC试验,结果表明,干法CRP在沥青中的均匀分散改善了沥青及沥青混合料的高温性能,并在上述研究基础上,研究总结了干法CRP改性沥青混合料的改性机理。(5)通过干法CRP改性的AC-13沥青混合料的马歇尔稳定度、车辙、冻融劈裂、低温弯曲等试验研究了干法CRP改性沥青混合料的高温稳定性、低温抗裂性、抗水损害能力。结果表明,干法CRP能明显改善沥青混合料的高温性能、低温抗裂性、抗水损害能力等路用性能。本次研究成果对干法CRP改性沥青混合料施工工艺与应用有一定实用价值。
[Abstract]:Waste plastic modifier CRP is made from waste plastics as raw material. The mixing of dry modified asphalt mixture is to mix CRP modifier directly into the mixed mixture at proper mixing temperature, and mix it for a certain time. Finally, after mixing with ore powder, mix it up. Its appearance can not only guarantee the high temperature stability, low temperature crack resistance and water stability of dry modified asphalt mixture, but also solve the serious segregation of waste plastic modified asphalt to some extent. Poor storage stability. The melting state and dispersity of dry CRP in asphalt mixture and the pavement performance of dry CRP modified asphalt mixture are studied in this paper. The main research results obtained are as follows: (1) A _ 70# asphalt / B _ 70# asphalt / C _ 70# asphalt and Korean SK-70# _ based asphalt are selected to test the performance of CRP modified asphalt with different content by laboratory tests such as penetration, softening point and viscosity. The results show that the dispersion of CRP in different matrix asphalt is different, that is, the effect of CRP on different matrix asphalt is different, compared with the effect of CRP modified Korean SK-70# asphalt is better. The effects of heating temperature, particle size and mixing time on the melting effect of CRP and aggregate were studied comparatively for the same type of aggregate (13.2 mm 9.5mm limestone). The results show that the optimum heating temperature of CRP dry modified asphalt mixture is 180 鈩，

本文编号：1903527