Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi
The concepts of physical and chemical transformations occurring in cement concrete under conditions of microbiological deterioration can be used to control the processes of the destruction of cement concretes in order to ensure the required durability and to predict the service life of products. The...
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MDPI AG
2024-10-01
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| Series: | Corrosion and Materials Degradation |
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| Online Access: | https://www.mdpi.com/2624-5558/5/4/22 |
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| author | Viktoriya S. Konovalova Varvara E. Rumyantseva Konstantin B. Strokin Aleksey A. Galtsev Denis G. Novikov Pavel V. Monastyrev |
| author_facet | Viktoriya S. Konovalova Varvara E. Rumyantseva Konstantin B. Strokin Aleksey A. Galtsev Denis G. Novikov Pavel V. Monastyrev |
| author_sort | Viktoriya S. Konovalova |
| collection | DOAJ |
| description | The concepts of physical and chemical transformations occurring in cement concrete under conditions of microbiological deterioration can be used to control the processes of the destruction of cement concretes in order to ensure the required durability and to predict the service life of products. The study of changes in the structural and phase composition of cement stone made of Portland cement grade CEM I 42.5N in the process of fungal deterioration for 6 months when moistened, as well as a sample of a concrete wall exposed to fungal microorganisms for 20 years, was carried out. Diffractograms of the studied cement stone samples contain a large number of pronounced narrow peaks and indicate a highly crystalline structure of phases with the presence of an X-ray amorphous phase of calcium hydrosilicates and tobermorite gel in the cement stone. Changes in the structure of cement stone under the influence of fungi are confirmed by the data of a derivatographic analysis. A decrease in the content of calcium hydrosilicates and ettringite, as well as other crystalline phases in cement stone, leads to a decrease in compressive strength by about 15% over 6 months of fungal degradation. Similar changes after 20 years of exposure to microorganisms suggest deterioration in the strength characteristics of concrete. |
| format | Article |
| id | doaj-art-ddc5f8b00136430aa9e9f6cc05f53383 |
| institution | Kabale University |
| issn | 2624-5558 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Corrosion and Materials Degradation |
| spelling | doaj-art-ddc5f8b00136430aa9e9f6cc05f533832024-12-27T14:18:43ZengMDPI AGCorrosion and Materials Degradation2624-55582024-10-015447648910.3390/cmd5040022Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> FungiViktoriya S. Konovalova0Varvara E. Rumyantseva1Konstantin B. Strokin2Aleksey A. Galtsev3Denis G. Novikov4Pavel V. Monastyrev5Department of Natural Sciences and Technosphere Safety, Ivanovo State Polytechnic University, Sheremetevsky Ave. 21, Ivanovo 153000, RussiaDepartment of Natural Sciences and Technosphere Safety, Ivanovo State Polytechnic University, Sheremetevsky Ave. 21, Ivanovo 153000, RussiaDepartment of Construction, Sakhalin State University, Kommunisticheskiy Ave. 33, Yuzhno-Sakhalinsk 693000, RussiaDepartment of Construction, Sakhalin State University, Kommunisticheskiy Ave. 33, Yuzhno-Sakhalinsk 693000, RussiaDepartment of Construction, Sakhalin State University, Kommunisticheskiy Ave. 33, Yuzhno-Sakhalinsk 693000, RussiaInstitute of Architecture, Construction and Transport, Tambov State Technical University, Sovetskaya st. 106/5, Tambov 392000, RussiaThe concepts of physical and chemical transformations occurring in cement concrete under conditions of microbiological deterioration can be used to control the processes of the destruction of cement concretes in order to ensure the required durability and to predict the service life of products. The study of changes in the structural and phase composition of cement stone made of Portland cement grade CEM I 42.5N in the process of fungal deterioration for 6 months when moistened, as well as a sample of a concrete wall exposed to fungal microorganisms for 20 years, was carried out. Diffractograms of the studied cement stone samples contain a large number of pronounced narrow peaks and indicate a highly crystalline structure of phases with the presence of an X-ray amorphous phase of calcium hydrosilicates and tobermorite gel in the cement stone. Changes in the structure of cement stone under the influence of fungi are confirmed by the data of a derivatographic analysis. A decrease in the content of calcium hydrosilicates and ettringite, as well as other crystalline phases in cement stone, leads to a decrease in compressive strength by about 15% over 6 months of fungal degradation. Similar changes after 20 years of exposure to microorganisms suggest deterioration in the strength characteristics of concrete.https://www.mdpi.com/2624-5558/5/4/22concrete biodegradationconcrete fungal deteriorationmicrobiologically influenced degradationconcrete strengthconcrete X-ray analysis |
| spellingShingle | Viktoriya S. Konovalova Varvara E. Rumyantseva Konstantin B. Strokin Aleksey A. Galtsev Denis G. Novikov Pavel V. Monastyrev Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi Corrosion and Materials Degradation concrete biodegradation concrete fungal deterioration microbiologically influenced degradation concrete strength concrete X-ray analysis |
| title | Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi |
| title_full | Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi |
| title_fullStr | Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi |
| title_full_unstemmed | Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi |
| title_short | Degradation of Concrete Cement Stone Under the Influence of <i>Aspergillus niger</i> Fungi |
| title_sort | degradation of concrete cement stone under the influence of i aspergillus niger i fungi |
| topic | concrete biodegradation concrete fungal deterioration microbiologically influenced degradation concrete strength concrete X-ray analysis |
| url | https://www.mdpi.com/2624-5558/5/4/22 |
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