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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">Construction Materials</journal-id><journal-title-group><journal-title xml:lang="en">Construction Materials</journal-title><trans-title-group xml:lang="ru"><trans-title>Строительные материалы</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0585-430X</issn><issn publication-format="electronic">2658-6991</issn><publisher><publisher-name xml:lang="en">Stroymaterialy</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">641741</article-id><article-id pub-id-type="doi">10.31659/0585-430X-2024-829-10-56-61</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>Статьи</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">Investigation of the effect of urease bioadditives on porosity and water absorption of cement composites</article-title><trans-title-group xml:lang="ru"><trans-title>Исследование влияния уреазных биодобавок на пористость и водопоглощение цементных композитов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Goncharova</surname><given-names>М. А.</given-names></name><name xml:lang="ru"><surname>Гончарова</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Doctor of Sciences (Engineering)</p></bio><bio xml:lang="ru"><p>д-р техн. наук </p></bio><email>magoncharova777@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dergunova</surname><given-names>Е. S.</given-names></name><name xml:lang="ru"><surname>Дергунова</surname><given-names>Е. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Candidate of Sciences (Chemistry) </p></bio><bio xml:lang="ru"><p>канд. хим. наук </p></bio><email>dergunova14@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sverdlov</surname><given-names>А. А.</given-names></name><name xml:lang="ru"><surname>Свердлов</surname><given-names>А. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Engineer</p></bio><bio xml:lang="ru"><p>инженер </p></bio><email>smidt48@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sdvizhkov</surname><given-names>М. А.</given-names></name><name xml:lang="ru"><surname>Сдвижков</surname><given-names>М. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Engineer</p></bio><bio xml:lang="ru"><p>инженер </p></bio><email>maksimsdv@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chigasov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Чигасов</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Engineer</p></bio><bio xml:lang="ru"><p>инженер </p></bio><email>astarta_office@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lipetsk State Technical Univrsity</institution></aff><aff><institution xml:lang="ru">Липецкий государственный технический университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-11-13" publication-format="electronic"><day>13</day><month>11</month><year>2024</year></pub-date><issue>10</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>56</fpage><lpage>61</lpage><history><date date-type="received" iso-8601-date="2024-11-10"><day>10</day><month>11</month><year>2024</year></date><date date-type="accepted" iso-8601-date="2024-11-10"><day>10</day><month>11</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024,</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, ООО РИФ "СТРОЙМАТЕРИАЛЫ"</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">ООО РИФ "СТРОЙМАТЕРИАЛЫ"</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-11-13"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/0585-430X/article/view/641741">https://journals.eco-vector.com/0585-430X/article/view/641741</self-uri><abstract xml:lang="en"><p>The results of the application of the biomineralization process in concrete to improve concrete properties such as porosity and water absorption are presented. As a result of the research, an assessment of the activity of various bioadditives based on the Bacillus subtilis strain and isolates isolated from samples of chernozem soil of the Yelets district of the Lipetsk region was given.It was found that the immobilized bacteria slightly differ from the native form in terms of urease activity, however, when stored for more than 50 days. they maintain their activity at a high level, and native microorganisms lose their ability to function, reducing urease activity by 10 times practically to minimum values. It was also revealed that when using Portland cement of various types, there is a decrease in water absorption up to 30%, and porosity decreases up to 40%.The use of different types of fine aggregate also affects porosity, so when using the same parts of sand P1 and P2, porosity is lower than with a homogeneous fine aggregate.It was also noted that all samples had increased strength characteristics – compressive strength and bending strength by 15–25%, respectively. Thus, the use of bioadditives is optimal to achieve improved concrete characteristics.</p></abstract><trans-abstract xml:lang="ru"><p>Представлены результаты применения процесса биоминерализации в бетонах для улучшения таких свойств бетона, как пористость и водопоглощение. В результате исследований дана оценка активности уреазных биодобавок на основе штамма <italic>Bacillus subtilis</italic> и изолятов, выделенных из образцов черноземной почвы Елецкого района Липецкой области. Установлено, что иммобилизованные бактерии немного отличаются от нативной формы по значениям уреазной активности, однако при хранении в течение более 50 сут сохраняют свою активность на высоком уровне, а нативные микроорганизмы теряют способность к жизнедеятельности, снижая уреазную активность практически в десять раз до минимальных значений. Также выявлено, что при использовании портландцемента различных типов наблюдается снижение водопоглощения до 30%, а также снижается пористость до 40%. Применение различных типов мелкого заполнителя также оказывает влияние на пористость; так, при использовании одинаковых частей песка П1 и П2 пористость ниже, чем при однородном мелком заполнителе. Также отмечено, что у всех образцов возросли прочностные характеристики – прочность при сжатие и прочность при изгибе на 15–25% соответственно. Таким образом, использование биодобавок является оптимальным для достижения улучшенных характеристик бетона.</p></trans-abstract><kwd-group xml:lang="en"><kwd>biomineralization</kwd><kwd>Portland cement</kwd><kwd>concrete</kwd><kwd>porosity</kwd><kwd>water absorption</kwd><kwd>strength</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>биоминерализация</kwd><kwd>портландцемент</kwd><kwd>бетон</kwd><kwd>пористость</kwd><kwd>водопоглощение</kwd><kwd>прочность</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, Performance assessment of sustainable biocement mortar incorporated with bacteria-encapsulated cement-coated alginate beads. Construction and Building Materials. 2024. 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