%0 Journal Article %T Model change in strength of cement-wood material from birch %A Rudenko , B.. %K cement, lime, tensile strength, birch, Expo is de- samples, composite mother. %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