Patent ID: 6494978
Filing Date: 2002-12-17
Classification: B29C,B29K,B29L,E03F,F16L

Abstract:
A method for restoring a concrete structure having an interior surface susceptible to deterioration by contact with corroding agents wherein portions of said structure including portions of said interior surface have been removed as a result of said deterioration to create void spaces where said structure existed, comprising the steps of:a) positioning polyvinyl chloride thermoplastic liners sealed to each other where said interior surface has been removed to define void space between said thermoplastic liners and said concrete structure; b) hydrogenating a resin selected from the group consisting of polyurethane resin, epoxy resin and combinations thereof; c) applying said hydrogenated resin along with a curing agent comprising at least an isocyanate in said void space; d) allowing said resin and the curing agent to form a foam to a density of at least ten pounds per cubic foot, and to set to form a foam supporting said thermoplastic liners; e) painting a surface of each of said thermoplastic liners, which faces said concrete, with a composition comprising a polymer wherein the polymer is a copolymer of 2-propenoic acid, 2-hydroxypropyl ester, chloroethene and ethenyl acetate the polymer having a density of approximately 1.37 grams per cubic centimeter at 25 degrees Centigrade and a molecular weight of approximately 8,000 to 10,000.