Formulation design and performance evaluation of MMA-based anti-skid coating for airport pavements based on texture reconstruction

To achieve texture reconstruction, four types of MMA-based repair coatings for cement concrete pavements were designed by mainly using methyl methacrylate (MMA), two curing agents, and three high-quality aggregates including quartz sand, silicon carbide, and brown fused alumina. The coating consists of a double-layer structure: an interface layer and a functional layer. The mass ratio of the interface layer of MMA∶powdered benzoyl peroxide (BPO) is 25∶1, while that of the functional layer of MMA∶powdered BPO∶liquid curing agent∶aggregate is 100∶1∶3.3∶30. The performance of the MMA-based repair coatings was evaluated in terms of texture reconstruction state, interfacial bonding strength, and freeze-thaw durability. Research results indicate that in terms of texture reconstruction state, compared with the uncoated specimens (concrete roughened texture), the texture height, mean profile depth, and slope spectral density (characteristic wavelength=0.1 mm) of the MMA-coated specimens increase by 3, 7.5, and 23 times, respectively. After applying the MMA coating, the BPN of the concrete reference slab approximately doubles, and it has a good correlation with the mean profile depth (MPD) (R²=0.85), which verifies the consistency of skid resistance characterization results at different test scales. In terms of interfacial bonding strength, the pull-off strengths of the four MMA-based coatings at 3 and 24 h are concentrated in 3.47-4.46 and 3.70-4.76 MPa, respectively. This indicates that the MMA coatings not only have a fast curing speed but also exhibit excellent interfacial bonding performance with concrete, which is attributed to the physical interlocking behavior, chemical bonding interaction, and environmental adaptation mechanism of the interface interaction between MMA and concrete. In terms of freeze-thaw durability, after 150 freeze-thaw cycles, the uncoated specimens show extensive aggregate exposure; in contrast, after 300 freeze-thaw cycles, the coating peeling area of the MMA-based coating specimens is still less than 1%, and the concrete specimens maintain a sound apparent state, which demonstrates the good freeze-thaw protection performance of the coatings. Therefore, the designed MMA-based coatings possess abundant texture structures, excellent interfacial bonding performance, and good freeze-thaw protection capacity, providing new material reserves and reference ideas for the research on skid resistance repair and toughness improvement technologies of cement concrete pavements.