[en] The article presents the dry construction mixtures various components polydisperse flow with light and heavy particles rotating layer mechanics numerical and experimental study results. The obtained results allow to control the polydisperse flow layer rotation while it is mixing in the pneumatic mixer chamber working volume. The conditions for estimating the braking parameter of a rotating layer with polydisperse particles on the basis of which the working mixing chamber necessary dimensions can be effectively selected were analytically obtained. (paper)