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°. However, the contact angle of the 145° RNCB-S2 sample is important for low cost hydrophobic surface work. While the highest homogeneous roughness distribution (4.33 μm) 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 μm). 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.


Materials Science and Engineering

Keywords and Phrases

Cementitious Materials; Contact Angle; Hydrophobicity; Recycled Carbon Black

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Document Type

Article - Journal

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© 2021 Elsevier, All rights reserved.

Publication Date

01 Aug 2021