Process of mixing reinforcing elements with castable material

A process of preparing a mixture of cementitious castable material such as mortar or concrete, which mixture comprises a multiplicity of small elongate fiber reinforcing elements made of steel, iron or an iron alloy, the process comprising preparing a mixture of ingredient material for said castable material, introducing into said mixture a plurality of reinforcing members being in the form of groups of said reinforcing elements, having a thickness between about 0.1 and 1 mm and a length-to-thickness ratio between about 50 and 200, bound together in a group by a binder affectable by a disintegration ingredient, then mixing said mixture, causing thereby said reinforcing members to be substantially uniformly distributed therein, and further mixing said mixture, causing thereby said reinforcing members to be disintegrated by means of said disintegration ingredient into separate elements, which are further substantially uniformly distributed in the mixture.