Assessment of photocatalytic, superhydrophobic and self-cleaning properties on hot mix asphalts coated with TiO2 and/or ZnO aqueous solutions

Abstract

Photocatalytic, superhydrophobic and self-cleaning capabilities were promoted on asphalt mixtures. AC 6 and AC 14 mixtures were coated with TiO 2 and/or ZnO aqueous solutions by spraying. Physicochemical and morphological properties of bitumen samples were evaluated by FTIR and AFM. New pavement surface capabilities assessed with Water Angle Contact and Photocatalytic Efficiency tests. No deterioration was guaranteed for AC 14 TiO 2 , AC 14 TiO 2 ZnO, AC 6 TiO 2 and AC 6 TiO 2 ZnO solutions.