Abstract
The article is devoted to computer modeling of lightweight concrete composition. Various models of packing of porous aggregates in lightweight concrete are considered. As fillers for the model, granules of a round shape of low density of a porous structure with a low modulus of elasticity are taken. Methods of a numerical experiment with the use of the finite element method are used. The study of structural schemes is based on the approaches of fractal geometry, which is based on quasi-similarity principles. Influence of models of packing the structure and ratios of diameters of the fillers on strength characteristics of the output model of the combined medium is investigated. The fields of deformations and stresses are obtained. Preference of a two-component model based on the fractal triangle principle has been substantiated. The analysis of the model made it possible to determine parameters for concrete mixture design: the ratio between the binder and the aggregate, the ratio between the aggregate particles of various sizes.