%0 Journal Article %T Application of mathematical calculations of the packing density of the spheres to the composition of lightweight concrete %A Gavrilenko, A.. %A Zakrevskaya, L.V. %A Dvornikov, R.. %K The packing density, efficiency, concrete, aggregate. %J Actual directions of scientific researches of the XXI century: theory and practice %D 2015 %N 3 %P 3 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov