The paper examines the historical and cultural heritage of the Kolpashevo town founded in the 17th century in the Tomsk region. The architecture of the individual objects built by the local entrepreneurs late in the 19th and early 20th centuries is studied. The paper replenishes knowledge on the valuable historical and cultural heritage of the Russian towns and discussesи the problem of preserving historical settlements at the regional level.

The purpose of this work is to study the history of the architecture development in Kolpashevo with the assistance of local entrepreneurs.

The research methods include the literature review and the comparative and systems analysis of the data obtained. The practical implications of the research lie in using the obtained results in the lecture preparation and reports on the history of the Siberian architecture.

The novelty is the study of the historical and cultural heritage of Kolpashevo, one of the small towns of Russia, which has not been previously studied. The methodological and theoretical bases include the theoretical works of scientists, historians and architects, and the field study conducted by the author in 2019.

It is found that the Kolpashevo town has a great potential, including the valuable historical and cultural heritage, the rich history and unique nature. It is advisable to pay attention to the potential preservation and development of this historical town.

The article examines the general trends in design and construction in accordance with the model projects on classicism in Russia and the city of Tomsk. The development stages of design and construction in Russia late in the 18th and early 19th centuries are presented. Stand ard design ensures fast and high-quality construction throughout the country. This phenomenon covers almost and all design areas has a strong impact on the architecture of the Russian cities. The research concerns the preservation of historical buildings built in accordance with the model projects widespread in the Russian cities in the 18–19th centuries. Despite many works on classical architecture in the Russian cities, it has not been studied enough for Siberian cities and, in particular the city of Tomsk.

The purpose of this work is to study the development stages of the model design, identify bjects built according to the model projects in Tomsk and other cities of Russia, and carry out the comparative analysis. The following methods are explored: the literature review, comparative architectural analysis and cross-sectional analysis of the data obtained.

The novelty is the comparative analysis of classical buildings in Russia. This research involves previously unpublished archival materials and field studies.

It is found that in the 18–19th centuries, the spontaneous construction was ceased in Russia.

The streets took on clear geometric outlines and the houses met the given requirements accompanied by the model projects. In Tomsk and other Siberian cities, the model projects were based on wooden architecture that continued until the end of the 19th century. Buildings built during this period already had deviations from the classical style, namely the odd number of windows, symmetry breaking, and fillet decoration.

The article analyzes the problem of the architectural style evolution not only in the past, but also in the 20th century. The comparative analysis of the different scientific approaches to this issue shows both their similarities and differences as well as their compliance with the facts.

This paper compares the fundamental scientific works with new research results in the field and considers the history of this issue and systematizes the facts available.

The aim of this work is to carry out the comparative analysis of the architectural style evolution based on works of scientists of the 19–20th centuries, identify similarities and differences in their scientific points of view on this issue and discussions in the Soviet and modern literature.

The methodology and approaches of the study include the review of theoretical works of historians, art historians and architectural experts of the 19th and 20th centuries and also the up-to-date scientific publications.

Similarities and differences in the scientific opinions of researchers concerning the evolution of the architectural styles are identified due to the different scientific schools, goals and objectives of research, scientific interests and worldview of researchers.

The paper analyzes the changes in the functional and planning solutions of the rural architecture near the river Tom during the period of 1900–1960. The study identifies the main periods of transformation, factors affecting changes in the planning structure of the region, the degree and nature of their influence. The purpose of the paper is to identify the regularities of transformation and analyze the experience of adapting the functional and planning organization in West Siberia to changing economic relations in agriculture: from private ownership to strict state control (a new type of economic conditions) for the period of 1900–1960. The following problems are considered:

1. Identification of factors that determine changes in the functional and planning organization of the rural architecture for the specified period.

2. Determination of the development stages of the functional and planning organization of the rural architecture.

3. Evolution of the nature and structure of the functional and planning organization of the rural architecture.

Methodology and approaches involve the literature review, comparative and historical method of determining the architectural styles of the river Tom region for the period of the late 20th century, ethnographic methods of field research to collect the required materials (interviews, surveys, photographs).

The research implications determine the nature and results of transformation of functional and planning decisions in the context of Siberian material culture of the 20th century. The theoretical basis of this research is the work of Siberian historians, architects and ethnographers.

The article proposes a typology of the historical places in a city for their identification and typification. Classification is based on the analysis of the structural techniques that determine the morphological features of historical places in the urban structure. The use of fuzzy logics seems to be an actual tool to achieve objectivity in the analysis of territories of different development. The hierarchy of the regulated order is determined by the following system of factors: sustainable urban framework - ordinary buildings – visual accents; building-blockbuster, visual gap. Taking into account the sustainability, the following cultural and historical places are identified: the museum cluster, cultural and historical island, cultural and historical island of a mixed type, island-type town-planning with historical buildings, modern cluster.

The article presents the general review of the park areas with rugged topography in the city of Tomsk. The problems of landscaping the territory of rugged topography and ways to solve them are discussed for different cities. The obtained data concern the park areas of the historical Tomsk regions. The landscape analysis is given to the park areas, merchant houses and gardens of the 19th and early 20th centuries, which locate on the territory with rugged topography.

Relevance: Acoustic comfort in residential, public and industrial buildings. Existing types of wall panels often do not provide the required noise control.

Purpose: Investigation of the improvement potential for sound insulation of single- and multi-layer wall panels having finitegeometric dimensions with diffuse sound lowering. Design/methodology/approach: Consideration of the sound propagation through the wall panel based on the theory of selfcoordination of wave fields developed by the Prof. Sedov‟s scientific school.

Research findings: Analytical equations for calculating the limiting sound insulation of the wall panels determined by the inertial sound propagation. The improvement potential for sound insulation of single- and multi-layer wall panels having finite dimensions. Comparison of theoretical and xperimental results. It is shown that single- and multi-layer wall panels of finite geometric dimensions have improvement potential for sound insulation, which is determined by the ratio between their own and limiting sound insulation.

Practical implications: Wall panel design must take into account the improvement potential for sound insulation. The sound insulation of wall panels is improved without increasing their mass and thickness. This is of great importance for design solutions for wall panels of civil and industrial buildings.

Originality/value: The proposed method shows good agreement between experimental data and theoretical calculations. The improvement potential for sound insulation at the frequency level locates near the resonant frequencies, namely: near-boundary frequency of the full spatial resonance for single-layer wall panels; near-resonant frequency of the mass-elasticity-mass panels and near-boundary frequency of the full spatial resonance for multilayer wall panels and panel linings, respectively.

The paper presents the stiffness analysis and optimization of stepped columns constituting the core frame of the industrial building. The two-span cross section of a one- storey industrial building is investigated herein. The quasi-static calculation is performed using the limited load approximation method for the cross-section of the most loaded middle column. The critical Euler characteristic of the compressive longitudinal load is determined by the differential bending equations at the bifurcation instability in the column sections. The parameter optimization of the column cross-section is achieved through the nonlinear mathematical programming. The optimization of medium column cross-section is considered using the proposed calculation when setting a set of constraints for the optimization task.

The paper analyzes the influence of defects detected in a monolithic base slab on the possibility of its further application in the construction of a 25-storey high-rise frame building. Non destructive testing and vertical core sampling techniques are used for the detailed analysis of the monolithic base slab. It is found that irregularities in the procedure during winter concreting of the base slab decreases the strength properties of concrete and provides the defect formation in the slab structure, namely delamination of the lower protective concrete layer and uncovering of working reinforcement. For the safe use of the 25-storey high-rise building, the base slab is proposed to be strengthened by adding in-situ reinforced concrete layer 100 cm thick.

Surface acoustic measurements in examining pile foundations is increasingly used in practice, as it is an effective tool for the measuring the length and defects of piles. However, this method for diagnostics of monolithic pile structures, for example, bored piles, can lead to significant measurement errors. This is because the propagation velocity of acoustic waves in a bored pile is usually calculated theoretically, and many factors affecting the propagation velocity of acoustic waves are not taken into account. According to earlier research, dual channel acoustic measurements used to determine the length of bored piles, makes it possible to accurately calculate the propagation velocity of acoustic waves and, accordingly, the pile length. It is shown that dual channel acoustic measurements applied to bored piles allow detecting with sufficient accuracy such defects as cross-sectional deviations of the pile shaft along its length.

The paper presents the analysis of deformation caused by seasonal freezing and thawing of clay foundation soils during the construction of construction industry bases, waste treatment facilities and others, etc. The deformation generation and development during a single freezingthawing cycle and long-term cycles are discussed depending on the foundation depth of seasonally freezing soil, foundation pressure and other factors. It is shown that soil setting during thawing of the frozen soil significantly exceeds its bulging during freezing. Recommendations are given on the reduction and prevention of inadmissible deformations, and structural restoration and reinforcement. The advantages of pile foundations are shown against the natural foundations in seasonal soil freezing conditions.

The paper analyzes the Russian and foreign research into the use of nonstandard raw materials in the production of constructional anorthite ceramics. The raw materials with different chemical composition are investigated. It is shown that the use of nonstandard raw materials in the ceramic mixture makes it possible to obtain constructional products with 43.1 MPa compressive strength, 2150 kg/m3 density, about 7 % water absorption and frost resistance that meets the requirements of regulatory documents. The physical and mechanical properties are obtained due to the anorthite phase containing in the composition of end ceramic products, which is confirmed by the X-ray phase and microscopic analyses.

 The paper studies the properties of the gypsum binder after the addition of glass containing component (crushed granulated foam glass) and the suitability of the latter for the development of a new composition of the heat-insulated gypsum mixture.

It is shown that the addition of the glass containing component (GCC) fraction of 0.14–1.25 mm in the amount of 5–15 % provides the highest strength increase of the gypsum binder. The presence of GCC fractions of 0.063–0.14 mm in the composition of the gypsum binder increases its softening coefficient from 0.42 to 0.48.

The main properties of the gypsum mixture are studied after the addition of the GCC fraction of 0.063–4.0 mm in the amount of 30, 40 and 50 % of the binder mass. The initial setting of the GСС-containing mortar mixture occurs no later than in 6 minutes. The introduction of 50 % GCC significantly reduces the water retaining power to 85 %. An increase in the GСС content from 30 to 50 % in the composition of the gypsum mixture leads to a decrease in the thermal conductivity of the samples from 0.279 to 0.209 W/(m×°С). The compressive strength reduces from 15.85 to 9.273 MPa as the GСС content increases to 50 %. The adhesive strength to ceramic brick for compositions containing 30 and 40 % GСС ranges from 0.44 to 0.69 MPa.

In relation to physical, mechanical and heat insulating properties, compositions containing 30 and 40 % of GСС are the most effective. These compositions can be modified by the addition of various setting retardants, water-retaining and plasticizing additives.

The research developments in materials science in the construction field concerning the formulation and production process of fine-grain concrete are aimed at the formation of structure and properties that provide the appropriate performance characteristics. The literature review and experimental data on the concrete treatment made show that the required quality of concrete can be achieved by changing the concrete mixture composition, activation of aggregate and mixing water, introduction of multi-purpose modifying additives, different approaches, etc. The paper presents the development of the effective multi-purpose additive consisting of such industrial wastes as marble-microcalcite, nano silicon dioxide, microsilica, and peat hermally modified at 600 °C. The influence of this additive on hydrated cement and concrete properties is studied herein. It is shown that the introduction of the multi-purpose additive in an amount of 5 % with a decrease in the cement consumption, improves the compressive strength of hydrated cement stone up to 69 %. The chemical composition of new formations of modified hydrated cement is determined by the physicochemical analysis.

The paper presents the results of a comprehensive study of the particle morphology, size distribution, average size, specific surface area and agglomeration of SiO₂ nanoparticles obtained by plasma technology from natural high-silica raw materials (quartzite). The dynamic light scattering, transmission electron microscopy, and nitrogen adsorption techniques are used. It is shown that using the plasma source, polydisperse silica nanoparticles with the distribution of 10–300 nm can be obtained with the average size of 30 ± 7 nm and specific surface area of 71 ± 4 m²/g from natural quartzite. The average agglomerate consists of about 10 particles. The zeta potential varies from –54 to 9 mV for the powder, which can be useful in planning multicomponent systems. The investigated powder can be used as a hardening additive for the manufacture of building materials with improved performance for the creation of specialpurpose objects.

The paper presents the results of a comprehensive study of the particle morphology, size distribution, average size, specific surface area and agglomeration of SiO₂ nanoparticles obtained by plasma technology from natural high-silica raw materials (quartzite). The dynamic light scattering, transmission electron microscopy, and nitrogen adsorption techniques are used. It is shown that using the plasma source, polydisperse silica nanoparticles with the distribution of 10–300 nm can be obtained with the average size of 30 ± 7 nm and specific surface area of 71 ± 4 m²/g from natural quartzite. The average agglomerate consists of about 10 particles. The zeta potential varies from –54 to 9 mV for the powder, which can be useful in planning multicomponent systems. The investigated powder can be used as a hardening additive for the manufacture of building materials with improved performance for the creation of specialpurpose objects.

The paper considers the road transportation sector in the context of the negative impacts of the global economic and financial crises on the environment. The ecology-oriented development of the road construction, road repair and maintenance are described herein. The promising research and innovation development in Siberia includes the ways to increase the stability of asphalt concrete pavements, studying the possibilities of waste utilization produced by the local industrial enterprises (for example, stillage residues of the chemical industry) for the road asphalt modification; replacement of rock materials used in the upper and lower layers of the pavement coatings by by-passed stone, utilization of plastics scrap and rubber in polymer modification.