TY JOUR TI Influence of Material Homogeneity on the Accuracy of Strength Definition for High Performance Concretes KW High-strength concrete KW concrete homogeneity KW compressive strength KW quality control KW coefficient of variation KW test methods JO Proceedings of Petersburg Transport University AU Belentsov, Y.A. AU Kazanskaya, L.F. AU Dokshina, E.A. PY 2025 IS 22 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"