Vol. 17, Number 3, 2021

Editorial board

Contents

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Olga Volichenko, Beisen Kariev
The Paradigm of Urban Planning in Central Asia of the pre-Islamic Period

B. N. Yeltsin Kyrgyz-Russian Slavic University
Abstract. The pre-Islamic period (V–VIII centuries) in Central Asia, unlike Europe, was characterized by an urban planning «boom». Trading cities were rapidly emerging, growing and developing on the routes of international caravan trade and in places of mining. The Great Silk Road stimulated the emergence of new cities, connected and established political, trade and cultural relations between countries. The study determines the nature of urban planning in the pre-Islamic period in Central Asia and notes the continuity of the traditions of antiquity in the early Middle Ages. The characteristics and definition of the main structural parts of the city are given, as well as the main prerequisites and reasons for the emergence of cities in the period under consideration are formulated. The general and distinctive features of the planning that characterize cities with a predominance of nomadic or agricultural culture are revealed.
Keywords: urban planning, early Middle Ages, citadel, Shahristan city, Rabad, Rabat – caravanserai, Кoshk – feudal castle.

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Andrey Varlamov, Maxim Novikov, Milena Kurbangaleeva
Research of Concrete by Non-Destructive Methods

G. I. Nosov Magnitogorsk State Technical University
Abstract. Destructive methods for determining the strength of concrete have been considered and also the results and analysis of studies have been given in the article. The technique involved a random selection of cubes for each test series. Each type of test was subjected to 10 cubes. Impact, indentation and ultrasound tests were carried out in accordance with the existing Code. The analysis of the obtained results gives a more complete picture of the strength properties of the structure, of its further behavior under the influence of loads in comparison with the case when only one test method is used. One of the ways to save raw materials and energy resources is the introduction of non-destructive testing at precast concrete factories as an integral part of comprehensive quality control.
Keywords: concrete, non-destructive method, concrete strength, impact, indentation, ultrasound.

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Valery Bratchun a, Vitaly Bespalov a, Evgeniy Romasyuk a,
Anastasia Zagorodnyaya b, Oleg Pshenichnykh a
Complex Modified Road Hot and Cast Asphalt Polymer-Sulfur Concrete of Increased Durability

a Donbas National Academy of Civil Engineering and Architecture, b V. Dahl Lugansk National University
Abstract. Estimated service life of asphalt concrete road pavements, I-a and I-b technical categories before major overhaul (10–12 years) in the Donetsk People’s Republic and in Russia is not maintained. After five years of operation, they need major repairs [1–3]. The properties of asphalt concrete – a composite material with a coagulation type of contacts – are determined, first of all, by the quality of the organic binder, a rational combination of types of macrostructure, mesostructure and microstructure of the mineral backbone, pore space, as well as the energy of interaction at the interface between the phases «organic binder–mineral material» [4–10]. Thus, it is necessary to develop such methods of directed regulation of the structure and properties of oil road bitumen and increasing the energy interaction at the interface between the phases «organic binder–mineral material» Donetsk People’s Republic and in Russia effectively resist aging, shear deformations, low-temperature and fatigue cracking, and cyclic transport loads [11–19].
Keywords: complex modified hot and cast road asphalt-polymer concretes of increased durability.

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Mark Panasyuk
Limiting Conditions of Floor Belts of Frameless Buildings on an Unevenly Deformable Base

Donbas National Academy of Civil Engineering and Architecture
Abstract. The limiting states of the reinforced concrete floor belt of the wall of a frameless building are investigated in case of uneven settlements of foundations as a result of uneven compressibility of the foundation soils or from special influences, for example, the curvature of the earth’s surface during the development of the territory. Field studies have established that the floor belt above the openings in the wall undergoes bending deformations and, in the limiting state, collapses along normal or inclined sections. The forms of destruction depend on the belt reinforcement scheme. Signs of destruction can be: flow followed by rupture of the stretched reinforcement; the ultimate compressibility of the concrete in the compressed zone; flow followed by rupture of the clamps. The aim of the research is to establish reliable deformation criteria for the limiting states of reinforced concrete floor belts of frameless buildings on unevenly deformable foundations. Re-search methods are numerical studies of a finite element design model based on the hypotheses of the theory of plastic flow of concrete.
Keywords: relative settlements, theory of plastic flow, deformation criteria.

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Victoria Mazur, Elena Novitskaya, Anna Krupenchenko
Mathematical Modeling of the Air Velocity in the Air Layer with Natural Ventilation in Buildings of Indoor Swimming Pools with an Internal Thermal Insulation Circuit

Donbas National Academy of Civil Engineering and Architecture
Abstract. The article discusses the formation of an air flow in a ventilated air gap during natural ventilation of indoor swimming pool buildings with an internal thermal insulation loop using the SOLIDWORKS Flow Simulation tool for three-dimensional modeling of low-speed flows, integrated into the SOLIDWORKS 3D CAD software package. The values of the speed of air movement in the ventilated air layer in the buildings of indoor swimming pools with the device of an internal heat-insulating circuit have been obtained. Based on the data obtained, the investigated facade was divided into zones: corner and central. The equations of linear multiple regression are obtained taking into account the zoning of the investigated facade of the bathroom room to predict the air flow rate in the ventilated air layer in indoor swimming pool buildings when arranging an internal thermal insulating loop.
Keywords: indoor pool buildings, internal thermal insulation loop, air flow rate, ventilated layer, aerodynamic analysis.