Modification of Hydrophobicity of Concrete by Nanocomposite Particles

Abstract

Water conservancy project is a project constructed to control and deploys surface water and groundwater in the natural world to achieve the purpose of harm removal and profit. Water conservancy projects need to build different types of hydraulic structures such as dams, dikes, spillways, sluices, water inlets, channels, and fish channels. These buildings all require concrete to be constructed, so the research on the hydrophobicity of concrete is very important. The purpose of this article is to solve the problem of high hydrophobicity of concrete in water conservancy projects. Based on the super-hydrophobic surface theory and test method, the nano-concrete mixing ratio is debugged and determined based on the ordinary concrete mixing ratio. Six types of modifications are formulated. And unmodified nano-SiO₂ organic film-forming composite coatings, the effect of nano-composite particles on the hydrophobic properties of concrete was studied. Then the surface contact angle of the concrete after coating the nano-composite particles was measured, and the optimal amount of nano-SiO₂ in the coating was determined. The research results show that adding an appropriate amount of nano-SiO₂ to the coating can improve the roughness of the coating, so that the contact area between the droplet and the substrate is reduced, and the contact angle is increased. When nano-SiO₂ is added in excess, SiO₂ will produce agglomeration and contact angle. Instead, it will decrease; by measuring the water absorption of the coated concrete, it is found that the modified and unmodified nano-SiO₂ can significantly improve the hydrophobic water of the coated concrete, among which the improvement of the modified nano-SiO₂ is greater, and at the same time the water absorption of the concrete.

Keywords:

• Nanocomposite particles
• hydraulic engineering
• concrete research
• hydrophobic properties