抄録
This paper describes experimental and numerical investigations on pressure generation between membrane roofing and concrete substrate, in order to understand quantitatively the influence of property and moisture condition of concrete on blistering problem, which is one of the most common failures of membrane roofing. An air and water-vapor pressure in a void between concrete and a tight surface cover at elevated temperature was measured and a pressure diffusive equation in concrete for numerical analysis was derived. From both experimental and numerical results, it was proved that main factors of concrete substrate on the blistering pressure are moisture condition relating to water-vapor pressure and air-permeability. A numerical simulation of the blister growth presented has made clear that the numerical method proposed in this paper is useful for quantitative discussion on the blistering problem of membrane roofing.
