泡沫沥青冷再生混合料界面黏附性提升原理与路用性能验证

Interface Adhesion Enhancement Principle and Pavement Performance Verification of Foamed Asphalt Cold Recycled Mixture

泡沫沥青冷再生技术是沥青混合料回收再生利用的一种有效方式,为进一步提升泡沫沥青冷再生混合料的界面黏附性能,选取了三种材料对泡沫沥青冷再生混合料进行改性研究,从微观分子与宏观性能角度实现了对泡沫沥青冷再生混合料界面黏附性提升原理的分析与性能验证。首先,选取氧化锌、偶联剂与抗剥落剂作为增强泡沫沥青冷再生混合料界面黏附性的改性材料;其次,以扩散行为和剪切破坏强度为分析对象探究了泡沫沥青冷再生混合料界面黏附性的提升机制;最后,对改性泡沫沥青冷再生混合料路用性能进行了验证。结果表明,对泡沫沥青冷再生混合料界面黏附性提升效果最显著的是偶联剂,其可以有效改善泡沫沥青冷再生混合料的疲劳性能、低温性能和劈裂强度,还使混合料具有极佳的扩散能力与剪切破坏强度;抗剥落剂对混合料的提升效果较好,高温时混合料的剪切破坏强度高于前者,但扩散性能较差;从能量变化角度分析,氧化锌对混合料的提升效果最好,但氧化锌总体改性效果一般。

Foamed asphalt cold recycled technology is an effective way to regenerate asphalt mixture. To further enhance the interface adhesion of foamed asphalt cold recycled mixture, three kinds of amendments were selected to study modification of foamed asphalt cold recycled mixture. Interface adhesion enhancement principle analysis and performance verification of foamed asphalt cold recycled mixture were conducted from the point of microscopic molecular and macroscopic performance. Firstly, zinc oxide, coupling agent and anti-stripping agent were selected as amendments for foamed asphalt cold recycled mixture. Secondly, diffusion behavior and shear stress were calculated for foamed asphalt cold recycled mixture and other three modified foamed asphalt cold recycled mixture to analyze the interface adhesion enhancement principle. Finally, the macroscopic performances of the modified foamed asphalt cold recycled mixture were verified. The results show that the coupling agent has an excellent enhancement effect on foamed asphalt cold recycled mixture. The fatigue performance, low-temperature anti-cracking performance and splitting strength of the coupling agent modified foamed asphalt cold recycled mixture are improved effectively. What’s more, the diffusion ability and shear stress are fantastic. The enhancement effect of the anti-stripping agent is medium. Though the shear stress of the anti-stripping agent modified foamed asphalt cold recycled mixture at high temperature is higher than that of the coupling agent, its diffusion ability is worse. From the perspective of energy variation, the enhancement effect of zinc oxide is the best, but the overall modification effect of zinc oxide is relatively general.