Protective Characteristics of Enclosing Structures Exposed to Electromagnetic Radiation

Kupriyanov, V. N.; Shafigullin, R I

doi:10.1088/1757-899x/463/2/022061

Cited by 4 publications

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“…Still, the physicomechanical characteristics limit its possible use in building construction [43]. Biochar from residual biomass as a concrete filler to improve thermal and acoustic properties was studied [141]. The addition of biochar also significantly increased the sound absorption coefficient of concrete in the 200-2000 Hz range since it created pore networks inside the concrete.…”

Section: Lightweight Aggregate Concretementioning

confidence: 99%

“…The addition of biochar also significantly increased the sound absorption coefficient of concrete in the 200-2000 Hz range since it created pore networks inside the concrete. The data on the acoustic behavior of coconut fiber concrete are given in [141]. Coconut fiber was added in the amounts of 0.25%, 0.5%, 0.75%, and 1% cement.…”

Section: Lightweight Aggregate Concretementioning

confidence: 99%

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Sound-Absorbing Acoustic Concretes: A Review

et al. 2021

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Noise is continuously treated as an annoyance to humans and indeed commotion contamination shows up within the environment, causing inconvenience. This is likewise interesting to the engineering tactic that inclines to develop this noise proliferation. The basics of the sound-retaining proliferation, sound-absorbing properties, and its variables were rarely considered by previous researchers. Thus, the acoustic performance and sound insulation of constructions have gained significance over the last five decades due to the trend for accommodating inner-city flat and multi-story residential building condominiums. Due to this dilemma, the proliferation of high-driven entertaining schemes has engaged extraordinary demands on building for its acoustic performance. Yet, construction industries worldwide have started to mainly use sound-absorbing concrete to reduce the frequency of sounds in opened-and-closed areas and increase sound insulation. As reported, the concrete acoustic properties generally rely on its density, exhibiting that the lighter ones, such as cellular concrete, will absorb more sound than high-density concretes. However, this paper has an objective to afford a wide-ranging review of sound-absorbing acoustic concretes, including the measurement techniques and insulation characteristics of building materials and the sound absorption properties of construction materials. It is also intended to extensively review to provide insights into the possible use of a typical sound-absorbing acoustic concrete in today’s building industry to enhance housing occupants’ efficiency, comfort, well-being, and safety.

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Section: Lightweight Aggregate Concretementioning

confidence: 99%

Section: Lightweight Aggregate Concretementioning

confidence: 99%

Sound-Absorbing Acoustic Concretes: A Review

et al. 2021

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“…For this reason, the protective properties of the enclosing structures may decrease. A number of works are devoted to the study of the protective properties of enclosing structures, taking into account solar radiation and electromagnetic radiation [6][7][8][9][10][11]. Experimental sorption isotherms make it possible to determine the moistening of structural materials with sorption moisture, and can also be used to study the porous structure of materials [12].…”

Section: Introductionmentioning

confidence: 99%

Study of the dependence of equilibrium sorption humidity of heat-insulating products on temperature

Petrov

Kupriyanov

2021

E3S Web Conf.

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The desiccator method for products like mineral wool has a low accuracy, which is due to the small mass of the samples and the uneven content of the binder between the samples. The standard method does not involve testing materials at different temperatures. However, the value of sorption moisture depends not only on the nature and structure of the material, but also on the temperature conditions. At the moment, the regularities of changes in the sorption moisture content of materials depending on the air temperature have been studied only in separate scientific works and do not cover the entire spectrum of modern building materials. The paper presents the results of a study of the sorption moisture content of modern mineral wool products at various temperatures above 0 ºС. The results show an increase in sorption humidity with decreasing temperature from 22 ºС to 0 ºС. The greatest increase in humidity occurs at values of relative air humidity in the range of 90–97 %. It is shown that the standard desiccator method for studying sorption moisture requires scientific development and increased control of test conditions with decreasing temperature.

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“…Проверка результатов расчета влажностного режима проводится при натурных исследованиях ограждающих конструкций [12][13][14] и при лабораторных экспериментах [15]. Результаты расчета влажностного режима позволяют уточнить тепловые потери здания [16][17][18][19], его долговечность [20], защиту человека от электромагнитного излучения [21].…”

Section: Introductionunclassified

Moisture potental theory application for modelling of enclosing structure unsteady-state moisture regime

Zubarev

2019

Vestnik MGSU

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Introduction. Known calculation methods for enclosing structure unsteady-state moisture regime proposed by K.F. Fokin, are examined. The first one describes moisture transfer in a sorption zone, and another allows calculation in oversorption zone also. “Thermodynamic moisture potential” of enclosing structure materials introduced by V.N. Bogoslovsky is described. Moisture potential F developed by V.G. Gagarin and V.V. Kozlov is shown. The moisture potential F allows describing water vapor and liquid moisture movement in material in a consistent way. The scientific novelty of the study is the development of calculation method based on moisture potential F. Practical relevance of the study is the possibility to obtain performance humidity values of enclosing structure materials by means of calculations for engineering practice. Materials and methods. A moisture transfer equation is derived on the basis of process physical interpretation, A mathematical model, consisting of heat conductivity equation, derived moisture transfer equation, spatial-time domain, boundary and initial conditions, is formulated. Moisture potential in single-layer and multilayer enclosing structures is determined using finite difference method. Results. Calculations for four types of enclosing structures are made on the basis of the proposed mathematical model: single-layer aerated concrete wall; a wall made of aerated concrete masonry base and clay brick cladding; a wall made of aerated concrete masonry base and mineral wool insulation with thin plaster layer; a wall made of aerated concrete masonry base and expanded polystyrene insulation with thin plaster layer. Conclusions. Calculated performance humidity values of enclosing structure materials were lower than values stated in regulatory documents. The presented results allow to define building heat loss definition and heating system design more accurately. Specification data on maximum wetting plane position obtained earlier were proved within the framework of the developed theory: in enclosing structures with aerated concrete base and mineral wool insulation maximum moisture content is located at the joint of plaster and insulation layers; in enclosing structures with aerated concrete base and expanded polystyrene insulation maximum moisture content is located in the insulation layer. Acknowledgements. Authors are deeply indebted to V.V. Kozlov, PhD in Technical Sciences, and V.K. Akhmetov, Doctor of Engineering Science, Professor, for discussion and useful comment in the course of study.

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Protective Characteristics of Enclosing Structures Exposed to Electromagnetic Radiation

Cited by 4 publications

References 0 publications

Sound-Absorbing Acoustic Concretes: A Review

Sound-Absorbing Acoustic Concretes: A Review

Study of the dependence of equilibrium sorption humidity of heat-insulating products on temperature

Moisture potental theory application for modelling of enclosing structure unsteady-state moisture regime

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