Characterization and hydrophobic surface study of silicon-based TiO2, ZnO and recycled carbon additives on cementitious materials surface

The hydrophobic properties of cementitious mortar surfaces coated with silicone-based TiO2, ZnO and recycled nano carbon black (RNCB) filled composites prepared in different proportions to protect building materials were compared. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffractometer (XRD), 3D surface profilometry, surface roughness and contact angle tests were performed to evaluate the surface performance of hydrophobic samples. The results showed that the particles were uniformly distributed over the mortar surface of the hydrophobic samples. It was determined that the amount of TiO2 and ZnO particles in the crystalline phase is an important factor in crystallite sizes and lattice strain. For the ZnO-S2 sample, the contact angle of the water droplet showed hydrophobic behavior up to 155 degrees. However, the contact angle of the 145 degrees RNCB-S2 sample is important for low cost hydrophobic surface work. While the highest homogeneous roughness distribution (4.33 mu m) was determined on the sample surfaces in the ZnO-S sample, the closest value to the ZnO-S sample was determined in the RNCB-S sample (3.47 mu m). In this study, it was tried to prevent liquid ingress from the porous structure of mortar by forming a hydrophobic coating on the mortar surface. Especially, the hydrophobic properties of RNCB particles on the cementitious material surface are thought to be important in reducing the wettability on cementitious material surfaces.

Automated summary

The study compared the hydrophobic properties of cementitious mortar surfaces coated with silicone-based TiO2, ZnO, and recycled nano carbon black (RNCB) filled composites, and evaluated the surface performance through various tests. The results showed that uniform distribution of particles on the surface, with the quantity of TiO2 and ZnO particles in the crystalline phase being important factors in crystallite sizes and lattice strain. The hydrophobic properties of RNCB particles on cementitious material surfaces are thought to be crucial in reducing wettability.