The resolving equations for the calculation of the stability of polymer compressed rods with the creep using Galerkin method are obtained. The problem is solved in the case of a simply supported pivotally-rod having an initial bending in the plane of the lower stiffness, and in the case of off-center application of force. Galerkin method used in combination with the finite element method, that is the shape functions are taken as the basis functions . The solution is made numerically, using the software package Matlab. There are two variants considered: a variant of the rod with constant and variable in length stiffness. It is shown that for rods with variable cross-sections and the same mass, a critical time has increased by almost 4.5 times. The solution for the rods of constant cross section agrees well with the solutions obtained by the method of finite differences. This may indicate the reliability of the proposed method  

Keywords: polymer rod, creep, Galerkin method, stability, variable stiffness

  In paper results of researches on activation of water-cement suspensions by manufacture of foam concretes nonautoclaving solidification and to increase of activity of cement by machining in electromagnetic apparatuses of a vortex band are presented.

Keywords: machining on cement suspension, increase of durability of a cement stone, processing time of cement, re-crushing of cement, activity of cement, activation, apparatuses of a vortex band

In article the analysis of a condition of production of cement concretes with use nano-technologies is carried out. A production technique of cement concretes with introduction nanoparticles and simultaneous levigating of a cementing agent is offered.

Keywords: nanodispersible modificators, nanotechnology, re-crushing portland cement parts, a strength improvement of cement concretes, vortex band apparatuses, activity of cement, activation, apparatuses of a vortex band