The thesis is devoted to the development of the technology of cementing system of the concentrated cement suspension with the increased early strength due to complex activation of cement CEM II/B-P-32,5R by Са(ОН)2 solution consisting ions of Са2+, ОН-, Н+ as well as nanoparticles of Са(ОН)2 and processing in an alternating electromagnetic field, and on its basis of heavy cement concrete with improved physical and mechanical properties, providing technical and economic advantages of concrete for monolithic construction of middle classes in strength using conventional cement CEM II/B-P-32,5R. While the manufacturing the concrete mix aggregates are mixed with a complex activated concentrated cement suspension and then a plasticizing additive is introduced into the concrete mix. There is shown the possibility to obtain the concrete with reduced concrete expenses without the loss of physical and mechanical properties at the expense of synergetic effect if treated with the concentrated cement suspension (including Са(ОН)2) and carboxyl-containing plasticizer in the alternating magnetic field. If treated with the concentrated cement suspension (including Са(ОН)2) and plasticizer in the alternating magnetic field there are intensified dissolution, dispergation and hydration of calcium silicates, calcium aluminates forming hydrocilicates and hydroaluminates in volume unit of concentrated cement suspension. It causes the formation of more calcium hydrosilicates, Са(ОН)2 and contacts in volume unit of matrix. As a result, it causes the increasing of matrix and concrete strength at an early stage. Obtained Portland cement compositions at an early stage (forty eight hours) increase the strength of matrix by 14,3 %, but at the stage of 28 days – 11,2 % in comparison with control specimens, depending on the content of cement in the concrete, and with the complex activation of cement by shuttering it with Са(ОН)2 and processing in a variable electromagnetic field, it rang in the reward of 2 days for 28%, and at hardening for 28 days - for 20,3%. There is confirmed the efficiency of application of concentrated cement suspension (including Са(ОН)2) and plasticizer in the alternating magnetic field to obtain concretes with reduced concrete content without the loss of physical and mechanical properties. There is calculated concrete composition with the use of concentrated cement suspension (including Са(ОН)2) and plasticizer in the alternating magnetic field, its implementation solves the problem of concrete strength increasing or 1m3 reducing of cement expenses. The obtained results in industrial conditions are approbated. Produced experimental concrete batch proved the efficiency of the application of concentrated cement suspension (including Са(ОН)2) and plasticizer in the alternating magnetic field.
Keywords: cementing system, solution, electromagnetic treatment, concentrated cement suspensions, dissolution, dispersion, plasticizer, physical and mechanical properties, resource saving.
