Using Fly Ash to Enhance the Mechanical Properties, Alkali Resistance and Waterproofing of Wall Primer Coating

This work aims to use fly ash waste as a reinforcing filler for alkali-resistant wall primer. The fly ash surface was treated with an alkaline solution. The results of color analysis, mechanical properties, and FESEM analysis show that fly ash slightly reduces the brightness of the coating, increases its washout resistance and alkali resistance, and reduces its water permeability. Usable fly ash content is from 10 to 30%, the surface coating has few defects, only a few fly ash particles appear on the surface, and fly ash particles tend to distribute inside. The coating creates a tight structure. At these concentrations, the primer has technical specifications that meet and exceed the requirements of wall primer coating, according to TCVN 8652:2012. In particular, the washout durability, alkali resistance, and waterproofing of the coating have been enhanced. Paint formulations containing fly ash can be applied and commercialized.