Method of producing concrete structures with a surface protection and a concrete structure produced in accordance with the method

US5797238A · kind A · utility

Assignee

• Delcon AB Concrete Development · SE

Inventors

• Leif Berntsson · Göteborg, SE
• Bengt Hedberg · Göteborg, SE

Key dates

• Filing date: Dec 18, 1995
• Grant date: Aug 25, 1998
• Expiry date: Dec 18, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B28B1/16
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Method of producing concrete structures with a surface protection layer and a concrete layer. The method includes moulding the concrete layer and the surface protection layer using a "wet in wet" process. The surface protection layer preferably consists of a cement allied mortar having a low water binding average ratio and a binding agent strength above 70 Mpa. The concrete layer which preferably consists of a concrete having a lower binding agent strength than the surface protection layer, is preferably an air entrained ballast concrete with dense structure and a strength in the range of 10-20 Mpa. The surface protection layer is cast in the bottom of a mold, and the concrete layer is cast above the surface protection layer. During desiccation of the material, the surface protection layer shrinks less than the concrete layer, so that pressure strains are created through deformation differences in the surface protection layer and concrete layer.