Tube internally coated with a cementitious composition and process for its manufacturing

The invention concerns a tube internally coated with a cement composition comprising a layer of cement mortar and a method for making such a tube. The invention aims at reducing or preventing the release of ions, and more generally, the release of elements originally present in the binding agent and transmitted into the environment outside. The method for making said tube consists in bringing solid materials at the surface of the cement mortar layer before the mortar sets. Said tube is characterised in that the cement mortar layer is covered by the solid materials embedded in said layer surface.