Journal of Architectural and Engineering Research <p><em><strong>Journal of Architectural and Engineering Research</strong></em> is an international, peer-reviewed, open-access e-journal, free of charge.</p> National University Of Architecture And Construction Of Armenia en-US Journal of Architectural and Engineering Research 2738-2656 <p><strong><em>Creative Commons Attribution-Non-Commercial (CC BY-NC)</em></strong>. <strong>CC BY-NC</strong> allows users to copy and distribute the article, provided this is not done for commercial purposes. The users may adapt – remix, transform, and build upon the material giving appropriate credit, providing a link to the license. The full details of the license are available at <a href=""></a>.</p> Increasing the Efficiency of Fine-Grained Lightweight Concrete Using Complex Additives <p><em>This work aims to investigate the physical and mechanical characteristics of high-strength lightweight concrete components on the basis of local porous fillers and complex additives. It is theoretically substantiated and practically proven that with optimal amounts of the complex additives – micro silica and superplasticizer Melflux 5581F, it is possible to obtain concrete with a compressive strength of up to 62 MPa&nbsp; and bending strength of 10.5 MPa, </em><em>profitably using the microsilica pozzolanic activity and super plasticizer,</em><em> which favorably changes the nature of porosity. Depending on the water/cement ratio, micro-and macro capillary pores of different origins, as well as other shape pores appear in the cement stone, which significantly affects the physical and mechanical characteristics of the concrete: strength, water absorption, water permeability, frost resistance, durability, etc.</em></p> Grigor Arakel Arakelyan Amalya Karapet Karapetyan Maria Martin Badalyan Anahit Arshak Ghahramanyan Evgeny Michael Makarov Copyright (c) 2022 Grigor Arakel Arakelyan, Amalya Karapet Karapetyan, Maria Martin Badalyan, Anahit Arshak Ghahramanyan, Evgeny Michael Makarov 2022-06-29 2022-06-29 2 3 8 10.54338/27382656-2022.2-001 Efficiency of Using Geoinformation Systems in the Design of Gas Distribution and Gas Consumption Networks <p><em>The scientific article is devoted to determining the effectiveness of the use of geoinformation systems (GIS) in the design of gas distribution and gas consumption networks. An experiment was carried out on a laboratory stand modeling ring, dead-end and mixed gas networks. The electronic model of a gas network identical to the laboratory stand in the ZuluGaz 10.0 software package, a module for expanding the GIS functionality for calculating gas supply networks designed to solve various industry. A comparative analysis of the results of an experiment and the results obtained during simulation in GIS is carried out. Based on the analysis, a conclusion is made about the accuracy of the GIS results and the feasibility of using GIS for the design of gas distribution and gas consumption systems.</em></p> Vadim Igor Bespalov Mihran Grigor Stakyan Grigorii Sergey Grishin Copyright (c) 2022 Vadim Igor Bespalov, Mihran Grigor Stakyan, Grigorii Sergey Grishin 2022-06-29 2022-06-29 2 9 13 10.54338/27382656-2022.2-002 Method of Calculation of the Sediment Drying Structure in Natural Conditions <p><em>Dewatering of sediments of natural water treatment plants is one of the most important technological and environmental problems of their operation. The use of drying in natural conditions ensures low energy consumption with the achievement of the necessary results in the moisture content of the sediment. The increase in the rate of dehydration is facilitated by the use of structures using the capillary effect to increase the rate of dehydration. The designs of dewatering sites with such elements have been developed and the article presents the method of their calculation.</em></p> Denis Alexander Butko Arestak Aramayis Sarukhanyan Copyright (c) 2022 Denis Alexander Butko, Arestak Aramayis Sarukhanyan 2022-06-29 2022-06-29 2 14 21 10.54338/27382656-2022.2-003 Problems Related to Creation of Estimate and Organizational -Technological Design Databases in Bim <p>The problems related to formating of estimate and organizational-technological design simplified databases in BIM platform are considered (explored). It is proposed to combine the data necessary for estimate and organizational-technological design in one flexible system with an option of updating the information in its sub-systems by monitoring the means suggested.</p> <p>Simplified formulas for calculation of costs are presented which allows us to come to certain conclusions regarding the approaches to determination of operational expenses for various construction machines and mechanisms.</p> Armine Bagrat Ghulyan Armen Gerasim Avetyan Satenik Seyran Hayrapetyan Copyright (c) 2022 Armine Bagrat Ghulyan, Armen Gerasim Avetyan, Satenik Hayrapetyan 2022-06-29 2022-06-29 2 22 27 10.54338/27382656-2022.2-004 Three Kinds օf Porosity օn Functionally Graded Porous Beams <p><em>In this paper, the effects of three types of porosity on bending behavior of functionally graded porous (FGP) beams are studied. The finite element procedure is established and based on the simple Timoshenko beam theory. The results achieved in this paper are presented and compared with other results in the references to verify the feasibility of implementing the formula and writing the Matlab code. On the other hand, this paper can help researchers to have an overview of the bending behavior of the functionally graded porous beams.&nbsp; </em></p> Lan Hoang That Ton Copyright (c) 2022 Lan Hoang That Ton 2022-06-29 2022-06-29 2 28 35 10.54338/27382656-2022.2-005 Anionic Dye Removal from Aqueous Solution Using Chitosan Modified Irind Mine Pumice <p><em>In this paper, the adsorption of Congo red dye from an aqueous solution using chitosan-coated pumice (CCP) has been studied. The abundant natural pumice from Irind mine (Republic of Armenia) was successfully activated by an acid activation method and modified with chitosan. The adsorbent was applied as a low-cost, and environmentally-friendly adsorbent for Congo red dye removal from aqueous solution. The modified pumice samples were characterized by Fourier-transform infrared spectroscopy (FT-IR). To study the adsorption behavior of Congo red dye on modified pumice, the batch adsorption method was used. The effects of operating parameters on Congo red dye adsorption on modified pumice were examined, including adsorbent dose, pH, contact time, and starting concentration. Solutions of Congo red dye concentrations before and after adsorption were measured by UV-Vis Spectrophotometer (Cary-60). The wavelength of 3.799 nm<sup>-1</sup> corresponds to the dye's maximum absorbance, and the obtained spectra revealed that no peak was found above the threshold after modifications.</em></p> Marine Ashot Kalantaryan George Eduard Abrahamyan Hovsep Ashot Hoveyan Copyright (c) 2022 Marine Kalantaryan, George Abrahamyan, Hovsep Ashot Hoveyan 2022-06-29 2022-06-29 2 36 40 10.54338/27382656-2022.2-006 Biophilic Design to Enhance Residence Comfort in Covid Era <p>Because of the COVID-19 pandemic, human mobility is limited, and many activities, such as work or school, are relegated to the home, including for apartment residents. As a result, this condition causes unpleasant feelings, which lead to a decline in physical and mental health. The solution from this is to improve room quality inside a limited area of apartment units using a biophilic design approach in order to create a comfortable living space for residents in a pandemic era. This research aims to critically review journals that can help architects or researchers study the ideal apartment design in the pandemic era. The anticipated outcome is the creation of opening and layout criteria that can add comfortable living for residence in a unit apartment at the same time, making it ideal to be applied. Air circulation and sun exposure are used to evaluate the opening, while room position and unit orientation are being used to assess the layout.</p> Rizka Tiara Maharani Dominikus Aditya Fitriyanto Copyright (c) 2022 Rizka Tiara Maharani, Dominikus Aditya Fitriyanto 2022-06-29 2022-06-29 2 41 51 10.54338/27382656-2022.2-007 Architecture Stages and Features of Compositional Formations of Khachkars <p><em>The article touches upon the origin of khachkar art, symbolism, stages of compositional development, as well as characteristics of artistic means. Since the 9th century, khachkar art has become a means of expressing the spiritual aspirations, religious perceptions and ideas of the Armenian nation. Thousands of khachkars, being one of a kind, are scattered not only throughout the Republic of Armenia and Arcakh, but also in the territory of Historical Armenia, including Turkey and Nakhichevan, as well as the Armenian colonies. Unfortunately, thousands of khachkars have been destroyed by vandals, who have tried and are trying to erase the Armenian trace outside the territory of present-day Armenia. The study aims at systematical presentation of the sequence of the phased development of khachkars, the compositionl, ornamental and national features typical of each period. </em><em>We think that any research devoted to those purely Armenian monuments is still up-to-date and can enrich the list of scientific works dedicated to Armenian culture.</em></p> Narine Emil Mkhitaryan Sherly Andranik Avedian Copyright (c) 2022 Narine Emil Mkhitaryan, Sherly Andranik Avedian 2022-06-29 2022-06-29 2 52 58 10.54338/27382656-2022.2-008 Vernacular Architecture in Armenia, from Travelers' Accounts, in the Western Context, from the 17th Century to the Present Day <p><em>The corpus of accounts by European travelers who visited Armenia </em>(Fig.&nbsp;1),<em> extracted from A. Marouti's research, as well as various writings by authors - Armenian architects during the Russian then Soviet period - will serve as a starting point for this research. Its objective is to put two questions in parallel: what consideration of vernacular constructions as genuine architectures in Armenia; and how this interest is situated about these architectures in the West. Using the Timelines tool, a chronological comparison ("side by side" in French) allows us to identify Soghomon Vardanian as a precursor to the recognition of the vernacular.</em></p> Suzanne Monnot Copyright (c) 2022 Suzanne Monnot 2022-06-29 2022-06-29 2 59 70 10.54338/27382656-2022.2-009 Analysis of the Structure of the Dispersed Gas Phase Produced in Turbulent Foam-Concrete Mixers <p><em>It was noted that the overall stability of foam concrete mixtures made by single-stage technology depends significantly on the measure of distribution of the dispersed gas phase involved in the mixing. The effect of the gas phase structure on the foam concrete mixture was evaluated by the value of the current consumed by the concrete mixer. The results of the experimental studies have shown the relevance of the scientific justification of mass transfer phenomena, that occur during mixing of raw materials in an industrial turbulent mixer. It was found that the process of dispersion of large-sized gas inclusions formed in the foam concrete mixture in the initial period of high-speed mixing is characterized by achieving the maximum power consumption at the mixer shaft.&nbsp; Then there is a slight decrease in energy consumption, in which there is an additional distribution of the dispersed gas phase, sufficient to attain stability of the foam concrete mixture.</em></p> Vladimir Nikolai Morgun Lyubov Vasiliy Morgun Viktor Vladimir Nagorsky Berhane Kumenit Gebru Copyright (c) 2022 Vladimir Nikolai Morgun, Lyubov Vasiliy Morgun, Viktor Vladimir Nagorsky, Berhane Kumenit Gebru 2022-06-29 2022-06-29 2 71 74 10.54338/27382656-2022.2-010 The Technological Alternatives for Energy and Hydraulic Improvements <p><em>The problem of converting attenuated hydraulic energy into power energy in an artificial local resistance unit placed on a gravity drinking water pipeline (outlet control valve, pressure regulator) without disrupting the hydraulic regime of the water pipeline is examined. It is recommended to replace the regulator with the same resistance hydraulic turbine, and thus,</em> <em>with its corrective device, automatically adjust the consumption outlet of the water pipe.</em> <em>&nbsp;The energy and economic data of the hydraulic turbine unit to be built on the «Arzakan-Yerevan» drinking water main pipelines have been presented as an example of proposal implementation. According to estimations, the small hydroelectric power plant on the Yerevan water pipeline could produce 90 million kWh of electricity per year. It should be noted that the water supply system in Yerevan has around 300 half-open valves and pressure control devices, </em><em>a</em><em>nd i</em><em>n case of conversion of many of them, it is possible to apply the suggestion given in the article</em><em>.</em></p> Aram Ashot Sahakyan Elena Gennady Tsurikova Copyright (c) 2022 Aram Ashot Sahakyan, Elena Gennady Tsurikova 2022-06-29 2022-06-29 2 75 82 10.54338/27382656-2022.2-011 Automated Real Estate Valuation With Machine Learning: A Case Study on Apartment Sales in Yerevan <p><em>Real estate is one of the major sectors of the Armenian economy and has been developing dynamically since Armenia transitions from planned to market economies in early 1990s. More recently, large online platforms have been developed in Armenia to advertise real estate offerings, thus reducing information asymmetry, and increasing liquidity in both sales and rental markets. Simultaneously, granular geospatial data became increasingly affordable via platforms such as OpenStreetMap, Google Maps and Yandex Maps. With granular data concerning a representative portion of the real estate offering available online, it is increasingly tenable to monitor the real estate market in real time and develop analytical tools that can automatically and accurately estimate the value of real estate assets based on their internal and external features. This paper sets out to analyze Armenia real estate market and assess the performance of a special class of machine learning models while predicting the price of a square meter of apartments in Yerevan. Furthermore, it is presented the way to determine the most decisive factors which have an influence on the price of apartments on sale.</em></p> Henrik Tigran Sergoyan Grigor Vahan Bezirganyan Copyright (c) 2022 Henrik Tigran Sergoyan, Grigor Vahan Bezirganyan 2022-06-29 2022-06-29 2 83 91 10.54338/27382656-2022.2-012 Fundamentals of Methodological Control of the Strength of Composite Materials <p><em>The idea of this paper is to propose research methods designed for strength analysis of composite materials which are widely used in load-carrying structures. It is shown that the strength analysis and study of composite materials are carried out in two directions – considering them as inhomogeneous composite materials, representing a regular multilayer medium of alternating reinforcement layers and a polymer binder, and the study of the issue of structural strength, in which composites are considered as homogeneous elastic orthotropic bodies, to which the theory of elasticity of anisotropic media is applicable. These approaches enables to represent the composites in the form of a continuous medium and&nbsp; use the methods of the theory of elasticity of anisotropic media in calculating the acting stresses, which makes it possible to use the influence of the elements of manufacturing technology on the physical and mechanical characteristics.</em></p> Hamlet Gurgen Shekyan Norayr Grigor Hovumyan Aramayis Viktor Gevorgyan Copyright (c) 2022 Hamlet Gurgen Shekyan, Norayr Grigor Hovumyan, Aramais Vardan Gevorgyan 2022-06-29 2022-06-29 2 92 96 10.54338/27382656-2022.2-013 Ceramic Materials with the Use of Innovative Supplements <p>The use of by-products of the coal industry in the production of wall ceramics is quite relevant.Coal waste is a promising raw material base for the production of ceramic wall materials. Coal sludge is widely used in the production of clay bricks at factories in the Urals and Kazakhstan.The most mastered technology is the use of coal waste as an additive in the production of ceramic products. The use of local waste allowsto minimize raw material costs. A new are of recycling existing products will help to not only lower the cost of the future products, but will also preserve natural resources.</p> Khungianos Stepan Yavruyan Evgeniy Sergey Gaishun Copyright (c) 2022 Khungianos Stepan Yavruyan, Evgeniy Sergey Gaishun 2022-06-29 2022-06-29 2 97 99 10.54338/27382656-2022.2-014