Shatalova S.V.

Postgraduate, Belgorod State Technological University named after V.G. Shukhov, Russia

FOR THE STUDY OF PECULIARITIES OF STRUCTURE FORMATION OF COMPOSITE BINDERS FOR NON-AUTOCLAVED AERATED CONCRETE

https://doi.org/10.34031/2618-7183-2019-2-3-41-47
Abstract
The basis of the modern market of cellular concrete is autoclaved gas silicate. At the same time, non-autoclaved aerated concrete is largely a more technological material, allowing the variation of its properties within a wide range, having a potentially wider field of application, less costly in the organization of production, which is of great importance for small and medium-sized businesses. The main problem of non-autoclaved aerated concrete is a higher cost of raw materials compared to silicate, and 20...30% lower strength performance. The proposed solution to this problem is the development of special composite binders with a limited content of clinker and mineral additives of various genetic types, taking into account the peculiarities of the two-stage structure formation of the material – gas porization and the formation of the microstructure of the stone. The article deals with some aspects of the interaction in the system “mineral additive – gypsum – by-products of the gas release reaction” in terms of the effect on the viscosity of the swelling mass and the strength of the stone at different times of hardening. Recommendations are given on the preferred compositions of composite binders and dosages of gypsum in the molding mixture when producing a material with an average density in the range of 500...700 kg/m3.
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COMPOSITE BINDING MINERAL ADDITIVE INFLUENCE ON THE PLASTICIZER EFFICIENCY

https://doi.org/10.34031/2618-7183-2019-2-2-10-16
Abstract
Replacing portland cement with composite binders in many construction spheres is becoming increasingly reasonable. A prerequisite for this is the ability to provide the binder with set of properties necessary for the most effective implementation of a particular practical task at minimum expense. Such optimization allows in some cases to achieve higher performance than the original cement, in others – to form new properties of the material, as well as provide direct or indirect savings of various resources. One of the most important parameters determining the strength characteristics of composites and their durability is the used binder water requirement. Furthermore in some cases the mixture must have certain rheological characteristics. Various types and generations plasticizing and water reducing additives are widely used to regulate these parameters. The article discusses relation of fine components electrosurface properties – the clinker component and various genetic types mineral additives for the main types of plasticizers magnitude diluting effect. The basic mechanisms and regularities are described, recommendations that allow to optimize the consumption of expensive additives or increasing their effectiveness in solving various practical problems are formulated.
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FEATURES OF THE SELECTION OF THE RATIONAL STRUCTURE OF THE COMPOSITIONAL GIPS BINDER

https://doi.org/10.34031/2618-7183-2018-1-2-45-52
Abstract
The dynamically developing construction in the Russian Federation makes it necessary to expand the range of alternative types of binders and materials based on them. Such a binder is a previously developed compo-site gypsum binder (CGB), used for the production of materials of various functional purposes.
The manufacture and use of CGB-based composites was made possible by studying the Portland cement-gypsum-water system, the stability of which is ensured by introducing an appropriate amount of active mineral additives that reduce the concentration of Ca(OH) 2 in the liquid phase of the hardening system and create the possibility of hardening under certain conditions without dangerous internal stresses. In this paper, we consider the possibility of using composite gypsum binder for fine-milled quartzitic sandstone crushing dropout and concrete scrap crushing dropout as an active mineral additive. Rational compositions of composite gypsum binder are developed and their basic properties are studied. The reasonable choice of the amount of active mineral additive allows optimizing the properties of the composite gypsum binder.
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