Penetration mechanism of the emulsion-based rejuvenator in damaged porous asphalt mixture: Microstructure characterization and 3D reconstruction

Porous asphalt (PA) pavement suffers from the early-stage raveling problem, which hinders wide application of this sustainable technology. Several promising attempts have been made to restore durability PA wearing courses by using surface treatment (ST) emulsions. However, working mechanism ST emulsion is still unclear. Therefore, study aims investigate penetration behavior in damaged PA. X-ray CT scanning was performed monitor changes pore microstructure specimens under three selected conditions. The spatial distribution residue back-calculated and 3D visualized through image analysis. coating efficiencies thickness distributions emulsions were quantitatively estimated characterize their status. analysis results showed that presents gradient characteristics with a deepest depth around 20 mm. reshaped interconnected-pore microstructure. specimen treated best efficiency thickest film performance recovery among outcomes are expected help optimize technology for PA, thus contributing more durable pavements.