The article is devoted to the analysis of methods for obtaining light-transmitting concrete, a material that combines the strength of concrete with the ability to transmit light.It briefly reviews the history of the development of light-transmitting concrete, from the initial experiments to the modern achievements in this field. The main focus is on the composition of the material, where optical fibers are added to the traditional components, creating a transparency effect and allowing the use of concrete in the implementation of new architectural solutions. The production of light-transmitting concrete requires a special approach, including the precise distribution of fibers and their fixation in the matrix, which ensures uniform light distribution. Various methods of embedding fibers into concrete, their advantages and complexities, as well as potential directions for the development of technologies and the use of the material in construction, are discussed.

Keywords: translucent concrete, optical fiber, production technology, gypsum cement binder

The paper presents the results of a study of the effect of galvanic sludge on the basic performance properties of special-purpose ceramics. The basis of the composition of the charge is low-plastic clay, and the functional additives in its composition are boric acid and cerium oxide. Ceramics are produced by semi-dry pressing at a pressure of 15 MPa and a maximum firing temperature of 1050 ° C. It has been established that galvanic sludge decomposes into calcium and heavy metal oxides, carbon dioxide and water vapor during firing. The oxides formed during liquid-phase sintering are part of the vitreous phase, functionally modifying its characteristics. When the content of galvanic sludge in the charge is more than 5 wt. % a developed porous structure is formed in the material, which reduces its main operational characteristics. It was revealed that liquid-phase sintering provides safe immobilization of heavy metals if the content of galvanic sludge in the charge does not exceed 6 wt. %. Practical application of the charge composition, including galvanic sludge in an amount up to 5 wt. %, will increase the resistance of ceramics to high temperatures, temperature changes, acids and alkalis. The use of galvanic sludge in this area will contribute to solving the environmental problem of its processing.

Keywords: ceramics, heat resistance, chemical resistance, liquid phase sintering, galvanic sludge, low-plastic clay, cerium oxide, boric acid

Phosphogypsum is a large-scale solid waste from the production of phosphoric acid by the extraction method. The volume of accumulated waste in the world amounts to hundreds of millions of tons, and their disposal is becoming increasingly important. The article provides a brief overview of recent research on the use of phosphogypsum as a component of building materials. A list of the main factors of the negative impact of phosphogypsum waste on the environment is given, as well as the main impurities in its composition that reduce the quality of the resulting materials and methods for eliminating these impurities. It is shown that of the many products that can be obtained using phosphogypsum, the most widespread are construction and road materials, in which it is proposed to be used as a replacement for natural gypsum and sand.

Keywords: phosphogypsum, environment, building materials, road coverings, modifying additives

Expert work has been carried out to establish quality indicators for three types of concrete paving slabs: "Auriko", "Paving stone", "New City". The tests were carried out on selected samples in accordance with GOST 17608-2017. According to the test results, it was determined that only the samples of "Paving stones" tiles meet the requirements of GOST, other types of tiles revealed non-compliance of the studied samples with GOST 17608 in terms of water absorption and frost resistance.Frost resistance tests for Aurico and Novy Gorod product samples were interrupted after 15 freeze-thaw cycles due to the destruction of the samples.

Keywords: paving slabs, concrete, compressive strength, frost resistance, surface defect "sink"

A study was conducted on the development of filler compositions based on heat-treated phosphogypsum for the production of paints and varnishes with luminescent ability. In the course of the study, it was revealed that the reduced phosphogypsum, which exhibits the properties of an ultraviolet pigment, can be used to produce paints and varnishes based on colorless varnish XB-784. When using a colorless varnish and synthesized ultraviolet pigment, paint and varnish materials can be obtained that form almost transparent coatings and have a luminescent ability. The introduction of unreconstructed phosphogypsum as a filler increases the covering capacity of paint coatings. Non-reduced heat-treated phosphogypsum as a filler does not give a luminescent glow under the influence of UV irradiation, however, it increases the hiding power of the material and enhances the luminescent ability of the UV pigment.

Keywords: filler compositions, colorless varnish, ultraviolet pigments, phosphogypsum, waste recycling

This research presents the methods and conclusions obtained from modeling a composite wall panel with a wooden frame and polystyrene concrete core in the Lira-SAPR program, used in the construction of low-rise buildings for residential and commercial purposes. The findings were compared with the results of panel tests at the research laboratory of the Pacific State University (hereinafter TOGU).

Keywords: linear calculation, panel construction, low-rise construction, LIRA-SAPR, modeling

В статье представляется совершенствование технологии гидроизоляции с помощью инъектирования. Специально для этих технологий разработана полимерцементная композиция для инъекционной гидроизоляции. The article presents the improvement of waterproofing technology by injection. A polymer cement composition for injection waterproofing has been developed specifically for these technologies.

Keywords: technology, production, injection waterproofing, injection method, repair and restoration work, polymer cement composition

The physical and mechanical properties, as well as structural and rheological indices of blended compositions based on viscous oil road bitumen and three specific grades of butadiene-styrene thermoplastic elastomers (KRATON 0243, KRATON 0246, KRATON 1192) of different composition and structure are investigated. The structure and properties of initial butadiene-styrene thermoplastic elastomers are considered. The influence of the polymer modifier topology on the properties of the final blended bitumen-polymer compositions has been shown. It is established that the change of polymer composition affects the whole complex of technical, technological and operational indicators of polymer-bitumen binders. Thus, the presence of 75% diblock structures in KRATON 0243 and 55% diblock structures in KRATON 0246 significantly affect both penetration and ductility of bitumen-polymer mixtures at 0 deg. С.

Keywords: butadiene-styrene thermoplastic elastomers of various topologies, viscous petroleum road bitumen

Vulcanization is a technological process that transforms plastic rubber into rubber. As a result of vulcanization, the shape of the product is fixed, and the material becomes more durable, hard and elastic. The purpose of the article is to determine the effect of octyl phenol-formaldehyde resin on the vulcanization parameters and to identify its optimal amount for the development of vibration-absorbing materials based on butyl rubber. The effect of a vulcanizing agent (octyl phenol formaldehyde resin) on the properties of the rubber compound during vulcanization was established. As a result of the study, the kinetics of vulcanization and the effect of various components on the properties of the rubber compound, such as elongation at break, conditional tensile strength and specific damping ability, were studied. This study is conducted in order to find the optimal rubber for placement in a seismic damper used in buildings and structures.

Keywords: vulcanizing group, vibration absorbing material, butyl rubber, rubber compound, vulcanization, octyl phenol formaldehyde resin, seismic damper

The article deals with the results of research on the influence of the dosage and composition of the complex mineral additive containing chemical water treatment sludge with gaize, burnt rock or fly ash. The result of investigation is the equation for the change in shrinkage deformations over the time for mortars containing a complex mineral additive in comparison with a standard mixture without additives. There is evaluating of the influence of changes in the mortar moisture on the amount of shrinkage deformation. On the base of the research, we astablished the dependences of shrinkage deformations on the moisture content of the mortar, according to the composition and dosage of the complex mineral additive. The study revaels the influence of a complex mineral additive on shrinkage deformations. The equation has been obtained that describes the change in shrinkage deformations depending on the relative humidity and it has been shown that the tested mortars with a rational composition and dosage of a complex mineral additive with an average air humidity of the driest month in Rostov-on-Don of 47% will not exceed 0.55 mm/m . Shrinkage deformation with the ratio of the complex additive with fly ash or burnt rock 20-30% are 0.42-0.79 relative to the additive-free standard.

Keywords: dry construction mixture, shrinkage, mineral additive, mortar, chemical water treatment sludge, burnt rock, fly ash

The article is devoted to the study of the main methods of ice crossings and their reinforcement. Key concepts related to this type of transportation are considered, including the definition of an ice crossing, its role in the transportation infrastructure, and the conditions necessary for its construction. Special attention is paid to the preparatory work carried out in summer and the main work carried out in winter. The methods of ice crossing reinforcement are described in detail, including thermal reinforcement, use of logs, snow reinforcement and use of geosynthetic materials. The advantages and disadvantages of each method are discussed, as well as factors influencing the choice of a particular reinforcement method.

Keywords: ice crossing, reinforcement

The article discusses the use of simplex methods of experiment planning to determine the optimal composition of composite building materials. Composite building materials are multicomponent systems, so their properties depend on a large number of factors that are diverse in nature and influence. The use of orthogonal plans is not able to adequately describe experimental data with a wide range of varying factors. Therefore, the article proposes to use simplex-lattice Scheffe's plans. A complete third-order model was developed to determine the optimal composition of the filled cement composite, and a regression equation was written. The adequacy of the equation was confirmed at the control points of the plan using the Student's criterion. The proposed planning method can be used to optimize the composition of multicomponent systems.

Keywords: multicomponent system, optimization methods, composite building material, experiment planning, simplex plans, Scheffe's polynomial, regression equation

This paper presents the results of experimental studies on the development of a chemical additive for concrete and mortar mixtures to establish a modifying effect. A chemical additive was developed - a multifunctional cleaning agent - “LOC”, in order to establish its modifying effect for concrete composites. The results of the experimental studies confirm the effectiveness of the chemical additive under study as a modifier. Composite material samples modified with the developed product show higher technical characteristics: the obtained BC samples correspond to the concrete grade for workability - P3, when the standard sample has a grade - P2, the compressive strength of the control BC samples, with a chemical additive - ""LOC"" in an amount of 1%, increases by 28%, the established optimal dose of the additive being developed - Ministry of Emergency Situations - “LOC” for Bx and mortar mixtures is 1%, which guarantees its economic efficiency.

Keywords: concrete composite, modification, surfactants, cleaning agent – “LOC”, anionic and nonionic surfactants, modifier, development, chemical additive, plasticity, strength, water absorption

The article examines the application of the method of mathematical planning of an optimal experiment in determining the strength characteristics of reinforced soils. For the analysis, a multicomponent soil system was studied, consisting of unsalted and saline soils reinforced with bitumen with cement additives and surfactants. During the planning of the experiment, factors affecting the strength characteristics and their levels, as well as the intervals of variation of factors, were determined. As a result of solving the problem, mathematical models of adhesion and angle of internal friction of reinforced soils were obtained. Based on the obtained regression equations, the main conclusions were drawn.

Keywords: stabilized soils, complex soil strengthening, experiment planning, complete factor experiment, mathematical model, regression equation

To implement effective adhesion of reinforcement to concrete, a large number of different types of periodic reinforcement profiles have recently been developed, the control of geometric parameters of which presents serious difficulties and allows for a high probability of measurement error. The urgency of the problem is due to the need to improve methods for measuring the geometric dimensions of reinforcement with a complex periodic profile in order to increase the accuracy of results along the entire length of the rod, the ability to measure the angles of inclination of axes, protrusions and dents, identify places of geometric stress concentrators to ensure the necessary quality of the finished product, reliable adhesion of reinforcement to concrete, increase the durability of reinforced concrete structures and products. The paper proposes a new method for measuring geometric parameters based on removing replicas from the surface of the reinforcement in different sections along the length of the rod. The analysis of prints presented in an expanded, flat form is carried out using counting and measuring devices, which significantly improves the accuracy and comparability of measurements, including angular dimensions. The use of modern optical devices and software for them helps to reduce the time for determining and visualizing geometric parameters, and improve measurement accuracy, which is measured in microns. The analysis of the obtained results showed an increase in the accuracy of measurements by removing replicas of geometric parameters of samples by 10-16.5% compared with traditional control methods. The developed method simplifies the measurement process, allows the use of alternative measuring instruments, a combination of calculation and instrument measurement methods.

Keywords: reinforced concrete products, profiles of reinforcing bars, methods of controlling geometric parameters, method of removing replicas, improving accuracy, reliability and comparability of measurements

The paper investigates the possibility of obtaining a luminescent material by heat treatment of phosphogypsum at a temperature of 800 degrees Celsius. It is shown that it is not enough to achieve the result of heating the system to a given temperature, the luminosity of the samples is practically absent.For phosphogypsum subjected to heat treatment at a temperature of 800 degrees Celsius for 60 minutes, it was found that images obtained in the presence of 50-150% moles of citric acid showed the most pronounced luminosity. The luminosity of samples with starch in the amount of 50-75 mol% was worse (by about 50%). The use of coal as a reducing agent under given conditions led to the formation of samples with the lowest luminosity. An extreme change in the dependence of luminosity on the amount of the introduced reducing agent with maxima of 25-75% (mol.) was revealed. It is suggested that the luminescent ability of the reduced phosphogypsum is associated with the formation of the composite material calcium sulfate/sulfide.

Keywords: heat treatment mode, luminescent material, phosphogypsum recycling, reducing

The study of the influence of the number of layers of glass composite pipe on dynamic loading, including operation in seismically active areas, is conditioned by compliance with the requirements of the latest documents in the field of construction standard control. Mechanical characteristics of glass composite pipe depend on elastic and strength properties of glass fibre, silica sand and binder, their ratio and bonding strength between layers. The key parameter of glass composite pipe compliance with the given requirements is ring stiffness. The strength of the composite material is determined using the rule of mixtures. The properties of the glass composite pipe using the rule of mixtures are determined. The influence of the number of layers of glass composite pipe on its elastic-strength properties is considered. The experiment with uniaxial compression of the pipe link is simulated in Midas GTS NX software package. The maximum load at which the sample reaches 5% deformation was determined. According to the results of the study, it was obtained that the best elastic-strength and operational properties have three-layer composite structure.

Keywords: glass composite pipe, layer scheme, earthquake resistance, continuous winding method, elastic-strength properties

The work is devoted to an urgent problem - the development of automated process control systems for the production of bricks with improved characteristics. The purpose of the article is to define and systematize the tasks of automation of brick production control systems, to develop both an algorithm for managing brick production and a generalized structure of automated control systems for brick production, and the tasks of the work are: optimization of control automation levels that determine the generalized structure of automated control systems for brick production, determination of information collection subsystems corresponding to the stages of brick production, and development of their structures, the choice of basic measurement tools for information collection subsystems. The results of the work are: systematization of requirements for modern automated process control systems, development of an algorithm for controlling technological processes and a generalized structural scheme of automated process control systems for brick production, development of information collection subsystems for the developed automated process control system, development of the structure of a local automated process control system in brick production - brick drying. The developed technical solutions can be recommended for control automation in various industries.

Keywords: brick production, technological process, drying, firing, control algorithm, automated control system, structural scheme, information collection subsystem, single-channel circuit, multi-channel circuit, measuring circuit, four-arm bridge circuit

The aim of the present work is to investigate the residual strength behavior of concrete reinforced with straight fibergalss fiber at levels of 0.8%, 1.2% and 1.6% and compare to hooked end steel fibers reinforced concrete same concentation. The laboratory tests were determined according to SP 297.1325800.2017 and reviewed literature. Test sampels was 100x100x400 with cut 17 mm in low beam in center. The residual strength behavior of Fiberglass reinforced concrete (FGRC) appeared to be comparable to SFRC, where the increase of fibers volume ratio cause the increase in prepeak and post-peak parameters of concrete. Nevertheless, the type of fibers influences much this dependency. Сoncrete mix composition was selected on the basis of compressive strength of control samples 37.5MPa. Tests were carried out to determine the crack resistance of fibre concrete on fibreglass fibre. Fibre F1 tested in this work showed a high result of extreme values of residual strength 36.3% higher than anchor fibre and 50% higher than corrugated fibre, this may be due to a more stable bond with the concrete matrix. The work resulted in concrete with crack resistance classes from Bft3= 2,5b to 6с. This study is a practical basis for the theoretical study of the effect of fibreglass fibre on the physical and mechanical characteristics of concrete.

Keywords: fiberglass fiber, FGRC, CMOD, pullout strength, analise, composite, residual strength

The work deals with the results of research on the influence of complex mineral additive: chemical water treatment sludge with burnt rock or fly ash or gaize. The rational content of chemical water treatment sludge in the complex additive was determined to be 50%. The relationship between compressive strength, flexural strength and W/C ratio, bettwen the flexural strength, E-modulus and the compressive strength were obtained. Complex mineral additive into fine grain concrete does not lead to a decrease in flexural strength and does not increase the E-modulus of fine grain concrete. The average range of the E-modulus of fine grain concrete with complex mineral additive practically coincide with those in Russian National Standart 56378 - 2015. The use of chemical water treatment sludge for fine grain concrete at amount of 20% of complex additive of a rateable composition instead of part of the cement provided to increasing of compressive strength at an equal W/C ratio relatively to the non-additive standard by 7 - 20%, and the flexural strength by 12 - 22% .

Keywords: miniral additive, tensile strength, modulus of elasticity, gaize, fly ash, burnt rock, chemical water treatment sludge

In conditions of high cost of construction materials, machinery, equipment and services it is necessary to consider the possibilities of increasing economic and energy efficiency of erected buildings. One of the options for solving this issue is the use of energy efficient products in construction. The article will consider one of the innovative thermal insulation materials - PIR boards.

Keywords: construction, thermal insulation, thermal insulation material, polyisocyanurate foam, frame-monolithic construction, wall panels, reinforced concrete, thermal calculation

Engineering preparation of the territory for the construction and development of a residential complex is a difficult task. In the development area, fluctuations in the groundwater level are possible due to natural processes - flooding of the territory or during operation due to man-made processes. The work presents the results of the survey and assesses the impact of future construction on the hydrological situation of the built-up areas. Materials from engineering-geological surveys of the composition of soils in the lake water area and the building area were studied in order to determine the possibility of using alluvial soil from the lake for engineering preparation of the territory.

Keywords: engineering and geological surveys, urban development, alluvial soil, engineering preparation of the territory

The results of a study of the influence of shrinkage deformations on the basic physical and mechanical properties of concrete are presented depending on various production and technological factors. The research methodology took into account the choice of the period of aging concrete in a dry, hot climate to study the influence of physical processes in concrete on its physical and mechanical properties. The influence of shrinkage deformations on the strength characteristics of concrete was studied. an increase in the intensity of mass transfer processes between concrete and the environment leads to an increase in destructive shrinkage deformations, mainly plastic shrinkage of concrete, which lead to changes in the structure and physical and mechanical properties of mature concrete. The consistency of the concrete mixture also influences the amount of strength reduction. with a greater value of plastic shrinkage of concrete, its compressive and tensile strength in bending decreases. the destructive effect of plastic shrinkage on concrete caused depends on a number of technological factors (consistency of the concrete mixture, w/c, temperature and humidity hardening conditions, etc.).

Keywords: curing period, mass transfer processes, plastic shrinkage, concrete structure, concrete strength, reconstruction, buildings and structures

The article examines the application of properties of polyethyleneimine (PEI) and polyacrylic acid (PAK) polycomplex composition for soil strengthening. During the studies, the ratio of PEI and PAA (by dry weight) was established, at which the reagents most fully enter the complexation reaction. The polycomplex composition of the optimal composition was used to strengthen the soils of some varieties. When studying the properties of hardened soils, dependencies were obtained: the ultimate strength of the hardened soil on the relative humidity and the thickness of the layer of hardened soil on the consumption of complexing reagents. The paper concluded that the use of polycomplexes for soil strengthening is promising.

Keywords: polycomplex composition, soil strengthening, polyethyleneimine, polyacrylic acid, impregnation method, dedusting, optimal humidity

A technological scheme for the production of biostable materials based on monoethanol-modified (N→B)-trihydroxyborate (MEATHB) stems of Sosnovsky's borer and polyurethane binder has been developed. This technological scheme differs from the traditional one in that it includes the process of plant raw material modification to ensure its biostability. The paper presents the results of determining the thermophysical properties of the obtained thermal insulation boards, as well as the results of assessing their biostability. The obtained results correspond to the current requirements for thermal insulation materials. The paper analyzes the main stages and processes necessary to create a high-quality and environmentally friendly product. The main types of plant raw materials used in the production of thermal insulation materials are considered, as well as the features of technological processes associated with its processing and formation. In addition, the advantages of using plant materials in the production of thermal insulation materials from the point of view of ecology are presented.

Keywords: technological scheme, biostable composites, Sosnovsky's borer, modification, biostability, monoethanolamino(N→B)-trihydroxyborate, heat-insulating material