The 4th Asian Concrete Federation Symposium on Emerging Technologies for Structural Longevity (ACF2023- ETSL)

192 / 2022-04-30 23:23:40

Surface treatment of cement-based materials by anti-ultraviolet aging hybrid nanoparticles

cement ; concrete ; nanocomposite; coating

Improving the durability of concrete through surface treatment is a crucial step toward low carbonization of building materials. In recent years, the superhydrophobicization of concrete surfaces has been achieved through the binary synergy of hybrid nanoparticles. However, the coatings formed by ordinary hybrid nanoparticles (HN-N) are prone to deteriorate under UV irradation.



Herein, a novel UV-resistant fluorinated hybrid nanocomposite, HN-F was synthesized and used for coating hardened cement-based materials. The penetration resistance of the NS-U coating was evaluated and compared to the HN-N coating. The experimental results showed that the HN-F treated samples possess enhanced water and gas impermeability after 336 hours of exposure to UV rays. Moreover, a hierarchical microstructure hypothesis (Fig.1) was proposed and the mechanism of  HN-F was further explored.



This research indicates a higher quality application for hybrid nanoparticles to optimize concrete under harsh UV irradiation.