Performance evaluation of rubberized and SBS modified porous asphalt mixtures

• Impact of crumb rubber (CR) and SBS on porous asphalt performance was investigated.
• CR and SBS enhance MR, skid resistance, moisture susceptibility, and rut resistance.
• Crumb rubber and SBS has negative effect on permeability of porous asphalt.
• CR-10% is the most effective dosage with respect to overall performance.

Porous asphalt (PA) has high drainage and noise-abrasion properties, however, its performance regarding rutting resistance, fatigue life, and moisture susceptibility is not as efficient as dens-graded mixes. This paper evaluates the influence of crumb rubber (CR) on performance enhancement of porous asphalt. PAs fabricated by asphalt cement incorporating 10%, 15%, and 20% of CR were compared with control and 5% SBS modified ones regarding rutting resistance, resistant to draindown, skid resistance, moisture susceptibility and permeability. Results indicate that, on one hand, CR and SBS reduce permeability of PA and, on the other hand, they improve rutting resistance significantly. In addition, despite initial improvement of resilient modulus, skid resistance, and moisture damage resistance, adding more CR has negative effect on these properties.