A brief historical overview of the evolution of requirements for the performance properties of wall materials is given. It is shown that the list of types of wall materials used is regulated by the level of urbanization of society and modern requirements for energy and resource conservation. An analysis of the types of defects that occur in multilayer walls of buildings during their operation has shown that the most important cause of their occurrence is an incorrect combination of materials with different porosity. The importance of taking into account the "single-layer" factor in construction, which allows ensuring the quality of construction and operation of buildings in Russia's diverse and difficult climatic conditions, was noted. Information is provided on the product range and operational advantages of non-autoclaved fiberfoam concrete as a material suitable for the construction of single-layer walls and capable of improving their protective and acoustic properties.

Keywords: safe use of premises, energy-efficient construction, gas-filled concrete, multilayer walls, mold, fiberfoam concrete, strength, thermal conductivity

Factors affecting the limited mineral resources of the planet and requiring the expansion of the raw material base of the construction industry are considered. The negative impact of overburden dumps on the ecological state of the habitat was noted. The importance of their processing into a useful product was emphasized in connection with the need to implement the industry program of the Russian Federation ""Involvement of overburden and containing rocks classified as production waste in economic circulation for 2022-2030."" The properties of sand and opoka as raw materials for making foam concrete were analyzed. The result of the analysis made it possible to formulate a list of restrictions, as a result of which it is undesirable to use opoku in concrete of a cast-in-place structure and a list of reasons, based on which it is possible to predict the feasibility of its use in foam concrete. The results of experimental studies are presented, reflecting the influence of the individual properties of sand and opoka on the density of foam concrete mixtures, the density of solidified foam concrete and the kinetics of their plastic strength during three hours of hardening from which it follows that replacing sand with opoka allows significantly improving the technological properties of foam concrete mixtures without compromising the achievement of their design density. It follows from the analysis of experimental data that the structural features of the foam concrete mixtures have a positive effect on the technological properties of foam concrete mixtures, which accelerate the gain of plastic strength of foam concrete mixtures after their placement into molds. The most important reason for the achieved result should be considered mesopores located in the volume of dispersed particles of aggregate from opoka. The established scientific facts make it possible to predict the expanded use of overburden rock - opoki in order to save resources in the construction industry and construction.

Keywords: resource saving, sand, opoka, foam concrete mixture, plastic strength

The article investigates the impact on the normal stresses of inequality of the young modulus for tension and compression in the bending of reinforced beams. Obtained formulas for determination of the bending moments that arise in the fixture, compressed and stretched zone of the aggregate. Found the formula for the normal stresses arbitrarily supported reinforced beams, arbitrary cross section and arbitrarily loaded bending loads. For example, reinforced beams of rectangular cross-section shows the determination of the neutral line and maximum stresses.

Keywords: reinforced beam, elastic modulus, stress, normal concrete

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Carried out a comprehensive analysis of the factors governing the strength and resilience foams, for the manufacture of foam concrete mixes. Found that lowering the temperature of mixing water helps to improve the structural properties of the foams. 
Keywords: surfactants, foam, lyotropic liquid crystals.

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