For the Study of Peculiarities of Structure Formation of Composite Binders for Non-Autoclaved Aerated Concrete

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.

Los áridos ligeros para los hormigones a base de residuos vegetales

“…In addition to organic substances, there are miner-al compounds in wood, giving 0.2-1.7% of ash, which consists of salts of alkaline earth met-als. In order to eliminate the negative influence of water-soluble substances on the cement paste hardening processes, wood is treated with chemical or physical methods (8,9) . A common type of light concrete made from wood waste is wood silicate (10,11) .…”

Effectiveness Evaluation Criteria of Using Fine Powders of Secondary Concrete as a Component of Composite Binder

“…Modern research in Russia and abroad shows that the most promising solution to problems related to environmental issues and rational use of natural resources in the production of highquality concretes is the transition from traditional mono binders to composite (multi-component) binders (CB) systems consisting of a basic binder and mineral components, which can be used as mechanically activated raw materials of technogenic origin [1][2][3][4][5]. In addition, there is no doubt that increasing the efficiency of binders as the basis of a construction composite in terms of reducing its content in the production technology of the product will significantly increase the technical and economic component of the production of concrete composites.…”

The Raw Materials Genetic Type Effect on the Water-Reducing Additives Effectiveness

“…A prerequisite for this is the ability to provide the binder with the minimum set of properties necessary for the most effective implementation of a particular practical task. Such optimization allows in some cases to achieve higher performance than the original cement, in other cases -to form the new properties of the material, as well as provide direct or indirect savings of various resources [1][2][3][4][5][6][7][8].…”