Study on High Performance Coating System for Precast Concrete Curtain Wall

Part 1. Deveropment of Environment-concious Type Water-based Undercoat

Abstract

Precast concrete curtain walls tend to be a large size and light-weight, and cracks of 0.1mm width can form at the original of concrete,in spite of flat painting texture in chosen by for design. And at the light-weight precast concrete used particular aggregate, new problem has occurred that it`s percentage of water content doesn’t goes down quickly. On one hand, recently it is requested to use the water-based coating materials that exhaust non volatile organic compounds to take care of environment. Therefore, we took notice the polyethylene emulsion that are high adhesion strength to high percentage of water content concrete, and we applied that to develop the water-based undercoat. Developed water-based undercoat adhere to concrete under 11 percentage of water content and prevent the formation the blister. And it has verified that developed water-based undercoat can control to width of clack that to be prevent the formation, by to control the thickness of it’s coated film.