TY JOUR TI FLOW CHARACTERISTICS OF A CEMENT-AIR MIXTURE IN THE PNEUMATIC TRANSPORT OF CEMENT KW pneumatic chamber pump KW pneumatic transportation KW fluidization KW the speed of air movement KW two-phase environment JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Bogdanov, V.S. AU Fadin, Y.M. AU Shaptala, V.V. AU Gavrilenko, A.V. PY 2016 IS 1 PB Belgorod State Technological University named after V.G. Shukhov