Raw blends grain-size composition optimization for obtaining pressed concretes on cement binding

The article deals with preconditions of optimal designing of building blends compositions in order to obtain pressed concrete on the cement binding, based on polydisperse structures formation regularity including micro- and nanolevel. The choice of methods of modelling of granular loose systems packings and calculation of optimal grading of raw blends with the densest grains packing, providing optimal parametres for blends compaction is given.The influence of raw blend humidity on the packing of its particles and bulk density, as well as on durability of a ready material taking into account effect of capillary coupling was shown.