"n this article, the influence of the physical state of chemical additives at the moment of their introduction into a gas-concrete mixture on the kinetics of gas evolution and the gas diffusion coefficient is considered. To test the working hypothesis, two compounds were designed and manufactured. As a part of С№1 chemical additives were entered in the form of a colloidal solution. A comparative analysis of the results of physical and mechanical tests of the aerated concrete samples of the tested compositions showed that the introduction of chemical additives in the form of a colloidal solution lowers the average density in the dry state due to a more intensive course of the gas evolution reaction without significantly reducing the compressive strength. At the same time, the average density increases in the composition of CN2.

Keywords: kinetics of gas evolution, gas diffusion coefficient, aerated concrete mixture, reactivity, expansion of aerated concrete mixture, colloidal solution

This article considers the effect of the introduction of a partially hydrated aerated concrete mixture on the intensity of gas evolution, the reactivity of a disperse gas generator, and the physical and mechanical properties of aerated concrete. To test the working hypothesis, two compounds were designed and manufactured. The pure dispersed gas generator was introduced into composition C№1, and a mixture of a gas generator with a partially hydrated gas-concrete mixture was introduced into the composition C№2. A comparative analysis of the results of physical and mechanical tests of the aerated concrete samples of the tested compositions showed that its introduction increases the compressive strength, while reducing the density of aerated concrete. At the same time in the composition of С№1 there is a higher density and a drop in strength

Keywords: Partially hydrated mixture, gas generator, aluminum powder PAP-1, reactivity, device PGV-2, kinetics of gas evolution, average density in the dry state, compressive strength

The composition of non-autoclaved aerated concrete with blast-furnace granular slag was developed and optimized, which was introduced in an amount from 5 to 15% instead of a part of the silica component (quartz sand) into aerated concrete. By the results of optimization by the method of least squares, the basic regression equations were obtained in the form of polynomials of the second degree and the optimal compositions of non-autoclaved cellular concrete with the addition of blast-furnace granular slag. In this case, the most effective is a dosage of 15%, which has a positive effect on the increase in strength of cellular concrete in comparison with the control composition and does not lead to an increase in the average density.

Keywords: non-autoclaved aerated concrete, active mineral additive, medium density in the dry state, compressive strength, blast-furnace granular slag, least-squares method, regression equation, silica component

This article considers the influence of a structuring additive on the physical and mechanical properties of aerated concrete. As a structuring additive, a by-product was introduced into the composition of the aerated concrete mixture by cutting the top layer of the "gorbuschka" in an amount of 10 to 30%. Comparative analysis of the results of physical and mechanical tests of aerated concrete samples with different amount of structuring additive showed that its introduction increases the compressive strength, while simultaneously increasing the density of aerated concrete. At the same time, the value of the constructive quality factor in GB4 (with 20% of the "gorbuschka") is 20.4% higher than in GB2 (with 30% of the "gorbuschka") and 31% higher than for the aerated concrete base composition GB1 (control) that allowed us to take him for the optimal composition in further research.

Keywords: "gorbuschka", structuring of aerated concrete, non-autoclaved aerated concrete, structuring additive, swelling process, plastic strength of the structure, constructive quality coefficient, average density in the dry state, compressive strength

The article is devoted to improving the quality of non-autoclave aerated concrete. The theoretical aspects is considered, the prescription-processing methods is proposed, results of experimental studies is given. The role of the sequence of introduction of the components and mode of preparation of concrete mixture is studied. The effect of hardeners on the properties of aerated concrete is revealed. It analyzes ways of waste disposal and their appropriate application.

Keywords: Concrete, structure, technology, recipe, recovery, sodium sulfate, partially hydrated cement system, an aluminum suspension, a hardening accelerator, coefficient of structural quality

  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

Information about authors of issue №2 (2011)

Keywords: authors