TY JOUR TI Activation of cement in the mill of the vortex type. Part 2. Changing the shape of cement particles KW activation KW vortex type mill KW particle shape criterion KW particle embossment KW properties of Portland cement JO Technique and technology of silicates AU Kondrashchenko, V.I. AU Titov, S.P. AU Kazakov, A.A. PY 2020 IS PB Individual Entrepreneur Svetlana Vasilievna Samchenko