Patent ID: 6998012
Filing Date: 2006-02-14
Classification: C04B,Y10T

Abstract:
1. A method for reducing the cohesion of a layer of bonded fixing agent, obtained with an hydraulic fixing agent that is based on Portland cement, a sulphate and aluminum component, and optionally other additives, wherein the hydraulic fixing agent, has (1) an adhesive pull strength of at least approximately 0.15 N/mm 2 when acted upon by water for 40 hours and (2) an adhesive pull strength of at most approximately 0.10 N/mm 2 when acted upon by an aqueous sulphate solution and/or an aqueous solution of an aluminum salt, each with a pH value of 12.5, for 40 hours, characterized in that the layer of bonded fixing agent is treated with an aqueous sulphate solution and/or an aqueous solution of an aluminum salt, each of which has a pH of at least approximately 7.5 and the layer of bonded fixing agent with its cohesion reduced is removed.