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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Structural Mechanics of Engineering Constructions and Buildings</journal-id><journal-title-group><journal-title xml:lang="en">Structural Mechanics of Engineering Constructions and Buildings</journal-title><trans-title-group xml:lang="ru"><trans-title>Строительная механика инженерных конструкций и сооружений</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1815-5235</issn><issn publication-format="electronic">2587-8700</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">36839</article-id><article-id pub-id-type="doi">10.22363/1815-5235-2023-19-4-392-409</article-id><article-id pub-id-type="edn">WNUWLC</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Construction materials and products</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Строительные материалы и изделия</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Physical features of the problems of liquid corrosion of reinforced concrete from the standpoint of the theory of heat and mass transfer</article-title><trans-title-group xml:lang="ru"><trans-title>Физические особенности проблем жидкостной коррозии железобетона с позиций теории тепломассопереноса</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6117-7529</contrib-id><name-alternatives><name xml:lang="en"><surname>Fedosov</surname><given-names>Sergey V.</given-names></name><name xml:lang="ru"><surname>Федосов</surname><given-names>Сергей Викторович</given-names></name></name-alternatives><bio xml:lang="en"><p>Academician of the RAASN, Doctor of Technical Sciences, Professor of the Department of Technologies and Organization of Construction</p></bio><bio xml:lang="ru"><p>академик РААСН, доктор технических наук, профессор кафедры технологий и организации строительства</p></bio><email>fedosov-academic53@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3694-5906</contrib-id><name-alternatives><name xml:lang="en"><surname>Krasilnikov</surname><given-names>Igor V.</given-names></name><name xml:lang="ru"><surname>Красильников</surname><given-names>Игорь Викторович</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Construction and Engineering Systems</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры строительства и инженерных систем</p></bio><email>korasb@mail.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7226-4580</contrib-id><name-alternatives><name xml:lang="en"><surname>Rumyantseva</surname><given-names>Varvara E.</given-names></name><name xml:lang="ru"><surname>Румянцева</surname><given-names>Варвара Евгеньевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Corresponding Member of the RAASN, Doctor of Technical Sciences, Professor, Director of the Institute of Information Technologies, Natural Sciences and Humanities</p></bio><bio xml:lang="ru"><p>член-корреспондент РААСН, доктор технических наук, профессор, директор института информационных технологий, естественных и гуманитарных наук</p></bio><email>varrym@gmail.com</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4342-4255</contrib-id><name-alternatives><name xml:lang="en"><surname>Krasilnikova</surname><given-names>Irina A.</given-names></name><name xml:lang="ru"><surname>Красильникова</surname><given-names>Ирина Александровна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of Technical Sciences, Associate Professor of the Department of Chemistry</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры химии</p></bio><email>irinanebukina@rambler.ru</email><xref ref-type="aff" rid="aff6"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Moscow State University of Civil Engineering (National Research University)</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Московский государственный строительный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Scientific Research Institute of Construction Physics RAASN</institution></aff><aff><institution xml:lang="ru">Научно-исследовательский институт строительной физики РААСН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Ivanovo State Polytechnic University</institution></aff><aff><institution xml:lang="ru">Ивановский государственный политехнический университет</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Ivanovo Fire Rescue Academy of State Firefighting Service of Ministry of Russian Federation for Civil Defense, Emergencies and Elimination of Consequences of Natural Disasters</institution></aff><aff><institution xml:lang="ru">Ивановский государственный политехнический университет</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="ru">Ивановская пожарно-спасательная академия ГПС МЧС России</institution></aff><aff><institution xml:lang="en">Vladimir State University</institution></aff></aff-alternatives><aff id="aff6"><institution>Владимирский государственный университет имени Александра Григорьевича и Николая Григорьевича Столетовых</institution></aff><pub-date date-type="pub" iso-8601-date="2023-11-15" publication-format="electronic"><day>15</day><month>11</month><year>2023</year></pub-date><volume>19</volume><issue>4</issue><issue-title xml:lang="en">VOL 19, NO4 (2023)</issue-title><issue-title xml:lang="ru">ТОМ 19, №4 (2023)</issue-title><fpage>392</fpage><lpage>409</lpage><history><date date-type="received" iso-8601-date="2023-11-26"><day>26</day><month>11</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Fedosov S.V., Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Федосов С.В., Красильников И.В., Румянцева В.Е., Красильникова И.А.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Fedosov S.V., Krasilnikov I.V., Rumyantseva V.E., Krasilnikova I.A.</copyright-holder><copyright-holder xml:lang="ru">Федосов С.В., Красильников И.В., Румянцева В.Е., Красильникова И.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/structural-mechanics/article/view/36839">https://journals.rudn.ru/structural-mechanics/article/view/36839</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The results of the study of non-isothermal mass-exchange processes occurring during liquid corrosion of iron-concrete are presented. The degree of development of this direction of research is shown: the classification of liquid corrosion of concrete is given, the effect of “free calcium hydroxide” on the stability of cement stone minerals is described, the relative change in the strength of concrete depending on the dimensionless concentration of calcium hydroxide is shown. For concrete and reinforced concrete structures subjected to liquid corrosion, the boundary value problem of non-isothermal mass transfer in the “cement concrete - liquid” system is formulated on the basis of a nonlinear differential equation of mass conductivity of a parabolic type with an arbitrary form of the initial concentration distribution function and combined boundary conditions of the first, second and third kind. A combined approach to solving the problem of non-isothermal unsteady mass transfer is proposed, based on the division of the life cycle of a building structure into “micro-processes”, followed by the separation of the thickness of the structure within the considered small time interval into concentration zones. Analytical solutions to the problem of unsteady mass transfer in the processes of liquid corrosion of concrete for each selected concentration zone have been obtained, allowing to calculate the concentrations of the target component in the solid phase, thereby predicting the dynamics and kinetics of destructive processes of cement concretes. Extensive numerical experiments have been carried out showing the effect of process parameters on the dynamics and kinetics of liquid corrosion of reinforced concrete.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Представлены результаты исследования неизотермических массообменных процессов, протекающих при жидкостной коррозии железобетона. Показана степень разработанности данного направления исследования: приведена классификация жидкостной коррозии бетонов, описано влияние «свободного гидроксида кальция» на устойчивость минералов цементного камня, показано относительное изменение прочности бетона в зависимости от безразмерной концентрации гидроксида кальция. Для бетонных и железобетонных конструкций, подверженных жидкостной коррозии, сформулирована краевая задача неизотермического массопереноса в системе «цементный бетон - жидкость» на основе нелинейного дифференциального уравнения массопроводности параболического типа с произвольным видом функции начального распределения концентраций и комбинированными граничными условиями первого, второго и третьего рода. Предложен комбинированный подход решения задачи неизотермического нестационарного массопереноса, основанный на разделении жизненного цикла строительной конструкции на «микропроцессы», с последующим выделением по толщине конструкции в рамках рассматриваемого небольшого временного интервала на концентрационные зоны. Получены аналитические решения задачи нестационарного массопереноса в процессах жидкостной коррозии бетона для каждой выделенной концентрационной зоны, позволяющие рассчитывать концентрации целевого компонента в твердой фазе и тем самым прогнозировать динамику и кинетику деструктивных процессов цементных бетонов. Проведены обширные численные эксперименты, показывающие влияние параметров процесса на динамику и кинетику жидкостной коррозии железобетона.</p></trans-abstract><kwd-group xml:lang="en"><kwd>liquid corrosion</kwd><kwd>durability</kwd><kwd>reinforced concrete</kwd><kwd>unsteady mass transfer</kwd><kwd>method of “micro-processes”</kwd><kwd>dimensionless variables</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>жидкостная коррозия</kwd><kwd>долговечность</kwd><kwd>железобетон</kwd><kwd>нестационарный массоперенос</kwd><kwd>метод микропроцессов</kwd><kwd>безразмерные переменные</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Erofeev V.T., Moiseev V.V., Makridin N.I., Maksimova I.N. Strength and deformability of cement stone, mortar and concrete during loading. 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