Investigation on performances of hot In-place recycling porous asphalt mixture

Abstract

This study focuses on the performance of hot in-place recycled porous asphalt mixture, which is considered as a low-carbon maintenance technology of porous asphalt pavement using high-viscosity modified asphalt as the binder. Based on practical engineering project, the performance of aged high-viscosity modified asphalt was analyzed, and the effects of plant-based oil and petroleum-based rejuvenators at varying contents were compared. The influences of different proportions of new porous asphalt mixtures on recycled mixture performance and the impact of basalt fiber on asphalt drain-down were also evaluated. Finally, observations from the field trial section were conducted to assess the performance of the recycled mixtures and pavement permeability. The plant-based oil rejuvenator demonstrated superior recovery performance for aged asphalt. The proportion of new added porous asphalt mixture was set at 15%. The drain-down loss percentage of the mixture dropped to 0.4% with the addition of basalt fiber. All performance indicators measured on the on-site trial section met design requirements, and the permeability coefficients exceeded the design value of 3600 mL/min. The results demonstrate that hot in-place recycling effectively restores the performance and permeability of porous asphalt mixtures, providing a sustainable maintenance method for porous asphalt pavements.