Strengthening of pressed building materials

The acceleration of hardening of compositions, based on cement and low cement binding materials, is possible in special conditions of concrete mixtures consolidation when a disperse system "binding aggregate" is being consolidated by a small amount of water. These are so-called methods of vibration pressing and pressing. Vibration pressing presupposes a binary mechanical influence on the consolidated mixture – vibration and pressure, generated by a power installation of a press or a set-on weight the strength of which is widely variable. No need for mixture plastic state sustention in the conditions of such influences imposes special requirements both for the mixture composition design and modes of its consolidation and strengthening. At present, a recovery of industrial powder wastes which do not possess the binding properties, while being produced by the traditional methods of building materials manufacture with the use of easy-to-place mixtures (vibration pressing, tamping, and casting), is not exercised on a large scale as there appears the necessity to increase the amount of the used binder based on Portland cement clinker above the normal level.