TY JOUR TI DETERMINATION OF THE DENSITY INDEX FOR DIFFERENT FRACTIONS OF SANDY SOIL KW density index KW sandy soil KW grain size JO Modern Technologies and Scientific and Technological Progress AU Obmanko, N.S. AU Knyazik, V.A. AU Baranova, A.A. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»