Abstract: A process for forming a baluster constructed from aggregates and a binder includes depositing on a core, preferably of metal, which is subjected to a rotary movement about its axis at a speed of not more than two revolutions per second, a first layer of concrete to obtain a cylindrical mass which is joined to the core and which is compacted by the action of a knife which strikes the surface of rotation, towards which there is driven or pushed the concrete which, once dimensionally stabilized in a presetting operation, is subjected to a second operation in which there is deposited a second layer of concrete having a finer granulometry. The knife has a shape which is the negative of that which is to be given to the piece with the mass being compacted by the action of the knife. Plural successive layers with a finer granulometry and a richer proportion may be supplied until the contemplated shape and dimensions are reached.