Methodology for Calculating the Composition of Structural and Thermal Insulation Cement Aerated Concrete for Prefabricated and Monolithic Сonstruction

The article describes a method for calculating the composition of cement-based aerated concrete with a microaggregate made of granite rock for prefabricated and monolithic construction, including construction using 3D concreting technology. The method is designed for calculating the compositions of aerated concrete for thermal insulation and thermal insulation and structural purposes (in the range of axial compression strength classes: B0.5–B5, and average density grades D200–D900) using casting technology, with the aerated concrete mixture expanding in the cavities of molds, removable and non-removable formwork, including wall structures built using 3D concrete technology, without vibration. The developed and experimentally and productionally tested methodology is based on the use of fine-grained fractions extracted from granite screenings, a technological waste from the production of granite crushed stone at State Unitary Enterprise Granit in Mikashevichi. In the article, the proposed methodology is presented using the example of calculating the composition of structural and thermal insulation aerated concrete with a class of axial compression strength of B0.5 and a medium density of D400, in accordance with the provisions of STB [Standards of the Republic of Belarus] 1570–2005. The technique is an integral part of the author's development of an energy-saving technology for cellular cement aerated concrete without autoclave hardening, which makes it possible to eliminate energy-consuming, technically complex and expensive autoclave equipment in the manufacture of prefabricated products. Due to the possibility of hardening such aerated concrete in natural conditions, it ensures the use of heat-insulating aerated concrete obtained from it in monolithic construction, including heat and sound insulation of building walls, constructed using 3D concreting technology, as well as the installation of building structures in removable and non-removable formwork using aerated concrete for structural and thermal insulation purposes. The Belarusian National Technical University is ready to cooperate with interested enterprises and organizations in terms of using the article's material and in other areas of construction.

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