泡沫沥青冷再生混合料界面附着力增强原理及路面性能验证

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.