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Anti-icing coatings for asphalt mixtures using sprayed hierarchical nano/micro-particle structures

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Resumo:In cold regions, icy roads cause hazards that extend beyond accidents, impacting communities and escalating air pollution during congestions. To reduce the risk of road accidents caused by ice formation on the pavement surface, new coatings have been developed to create superhydrophobic asphalt mixtures to avoid this issue. This study investigated the effect of two successive spraying coatings applied over an asphalt concrete AC 10: (i) diluted epoxy resin solution and (ii) dispersion of titanium dioxide (TiO2) and polytetrafluoroethylene (PTFE) particles in ethyl alcohol. The functionalised asphalt substrates were evaluated under the wettability by Water Contact Angle (WCA), freezing tests (Pull Off and observation of freezing water), friction by Pendulum, microtopography by Scanning Electronic Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDS). These samples were also submitted to abrasions processes to analyse the immobilisation of the particles. It was possible to conclude that the best percentage of resin and resin mass to achieve superhydrophobicity was 1:3 and 0.25 g, respectively. The Asphalt Concrete AC 10 reached superhydrophobicity when functionalized with with polytetrafluoroethylene (PTFE) submicrometer particles (200 nm) and titanium dioxide (TiO2) (28 nm) (with the proportion 2:2) and with PTFE (200 nm), TiO2 (28 nm), and PTFE microparticles (200 μm) (with the proportion 1:3:1). “AC 10 2PTFE 2TIO2,” “AC 10 4TIO2 4PTFE,” and “AC 10 1PTFE 3TIO2 1PTFE.” The freezing tests confirmed that the superhydrophobic coatings delayed freezing time, decreased the strength of the connection between the ice and the pavement, and maintained an acceptable friction value. These findings highlight the potential of superhydrophobic coatings to reduce the risk of accidents caused by ice formation on road surfaces.
Autores principais:Rocha Segundo, Iran Gomes da
Outros Autores:Moreira, Luís; Freitas, E. F.; Lima, Orlando; Kuzminov, Denis; Carneiro, Joaquim A. O.
Assunto:Friction Functionalization process Ice formation Layer-by-layer method Road safety Smart asphalt mixture
Ano:2025
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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