Abstract
In order to address water damage of asphalt pavement, reduce the occurrence of water-related potholes, deformation, and other diseases, and improve the performance and service life of the pavement, a nano-TiO2 superhydrophobic coating (PSC) on asphalt pavement was prepared from waterborne polyurethane and nano-TiO2 modified by stearic acid. FT-IR measured stearic acid successfully modified low surface energy substance on the surface of nano-TiO2. The SEM image shows that the PSC has a rough surface structure. The contact angle and rolling angle of the PSC in the contact angle test are 153.5° and 4.7°, respectively. PSC has a super-hydrophobic ability, which can improve the water stability of the asphalt mixture. Although the texture depth and pendulum value have been reduced by 2.5% and 4.4%, respectively, they all comply with the standard requirements. After the abrasion resistance test, the PSC coating still has a certain hydrophobic ability. These results surface PSC coating can effectively reduce water damage on asphalt pavement, and has considerable application value.
Highlights
The current research on asphalt pavement materials mainly focuses on the high and low- temperature performance and water stability of asphalt and asphalt mixtures [1]
The water stability of asphalt pavements is mainly studied in this article, and we hope to eliminate the water damage of asphalt pavement through a superhydrophobic coating
The results showed that the ZnO nanoparticles were modified from hydrophilic to hydrophobic
Summary
The current research on asphalt pavement materials mainly focuses on the high and low- temperature performance and water stability of asphalt and asphalt mixtures [1]. The damage is large and wide, which will eventually reduce the service life of the asphalt pavement and increase the maintenance costs in the later period. There are roughly two research directions for preventing the early damage of asphalt pavement water damage: improving the waterproof and drainage capacity of the pavement, and improving the adhesion between the asphalt binder and the aggregate. Among them, improving the drainage and waterproof performance of the pavement structure is the most direct and effective measure [5], which can reduce the accumulation of water on the pavement and prevent water from entering the asphalt pavement structure to decrease the water damage
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