Cement-bonded background with a coating applied on a surface side of cement-setting material and process for the retardation or prevention of the leaching out and hydrolytic corrosion of the cement into contact with water under ensure

摘要

Cement-bonded background with a coating applied on a surface side of cement-setting material, wherein the coating over its thickness d of between the coated surface and the outer edge of the coating has a porosity step in such a way that an outer edge zone of the coating has a lower porosity than the remaining layer thickness.