Biomineral additives for self-healing of concrete
Introduction. The reasons for the reduction of durability of flexural structures due to the violation of the protective layer of reinforcement are considered. It breaks down when cracks form. Cracks can self-heal by various methods, the most effective of which is microbial-induced precipitation of c...
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Moscow State University of Civil Engineering (MGSU)
2024-04-01
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| Online Access: | https://www.vestnikmgsu.ru/jour/article/view/235 |
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| author | T. N. Chernykh K. A. Gorbachevskykh M. V. Kriushin A. A. Orlov M. V. Komelkova P. O. Platkovskii |
| author_facet | T. N. Chernykh K. A. Gorbachevskykh M. V. Kriushin A. A. Orlov M. V. Komelkova P. O. Platkovskii |
| author_sort | T. N. Chernykh |
| collection | DOAJ |
| description | Introduction. The reasons for the reduction of durability of flexural structures due to the violation of the protective layer of reinforcement are considered. It breaks down when cracks form. Cracks can self-heal by various methods, the most effective of which is microbial-induced precipitation of calcium carbonate.Materials and methods. Bacillus subtilis strains VKM B-70 and VKM B-501 (All-Russian Collection of Microorganisms), microsilica, metakaolin, and fly ash were used. Bacterial activity was assessed by culturing bacterial strains from tablet specimens. The pH of the specimens was determined using the pH meter. The crack growth rate was assessed by visual inspection of the tablet specimens by the optical microscope.Results. The results of the experiment on selection of optimal size of alginate bacterial granules for biomineral additives are shown. The effect of biomineral additives of various compositions on the overgrowth of cracks with a width of 100 to 500 µm was studied. The effect of increasing bacterial activity in the presence of the pozzolanic component is shown. The relationship between the alkalinity of the specimen medium and bacterial activity was revealed.Conclusions. The recommended granule diameter is 1–1.8 mm. The bacterial activity in such granules increases in the presence of pozzolanic component in the composition of the additive. Fly ash was most effective in formulations with Bacillus subtilus bacteria due to its ability to lower the pH of cement-sand compositions. By lowering the pH, conditions that are more favourable are created for the vital activity of bacteria. When using complex biomineral additives, there is a significant increase in the rate of crack healing, which will allow self-healing of cracks with a width of 100 microns in just five water-air cycles. |
| format | Article |
| id | doaj-art-dced309817bb4509b543f77c90f116be |
| institution | Kabale University |
| issn | 1997-0935 2304-6600 |
| language | English |
| publishDate | 2024-04-01 |
| publisher | Moscow State University of Civil Engineering (MGSU) |
| record_format | Article |
| series | Vestnik MGSU |
| spelling | doaj-art-dced309817bb4509b543f77c90f116be2025-01-09T08:22:49ZengMoscow State University of Civil Engineering (MGSU)Vestnik MGSU1997-09352304-66002024-04-0119456957910.22227/1997-0935.2024.4.569-579108Biomineral additives for self-healing of concreteT. N. Chernykh0K. A. Gorbachevskykh1M. V. Kriushin2A. A. Orlov3M. V. Komelkova4P. O. Platkovskii5South Ural State University (National Research University) (SUSU (NRU))South Ural State University (National Research University) (SUSU (NRU))South Ural State University (National Research University) (SUSU (NRU))South Ural State University (National Research University) (SUSU (NRU))South Ural State University (National Research University) (SUSU (NRU))South Ural State University (National Research University) (SUSU (NRU))Introduction. The reasons for the reduction of durability of flexural structures due to the violation of the protective layer of reinforcement are considered. It breaks down when cracks form. Cracks can self-heal by various methods, the most effective of which is microbial-induced precipitation of calcium carbonate.Materials and methods. Bacillus subtilis strains VKM B-70 and VKM B-501 (All-Russian Collection of Microorganisms), microsilica, metakaolin, and fly ash were used. Bacterial activity was assessed by culturing bacterial strains from tablet specimens. The pH of the specimens was determined using the pH meter. The crack growth rate was assessed by visual inspection of the tablet specimens by the optical microscope.Results. The results of the experiment on selection of optimal size of alginate bacterial granules for biomineral additives are shown. The effect of biomineral additives of various compositions on the overgrowth of cracks with a width of 100 to 500 µm was studied. The effect of increasing bacterial activity in the presence of the pozzolanic component is shown. The relationship between the alkalinity of the specimen medium and bacterial activity was revealed.Conclusions. The recommended granule diameter is 1–1.8 mm. The bacterial activity in such granules increases in the presence of pozzolanic component in the composition of the additive. Fly ash was most effective in formulations with Bacillus subtilus bacteria due to its ability to lower the pH of cement-sand compositions. By lowering the pH, conditions that are more favourable are created for the vital activity of bacteria. When using complex biomineral additives, there is a significant increase in the rate of crack healing, which will allow self-healing of cracks with a width of 100 microns in just five water-air cycles.https://www.vestnikmgsu.ru/jour/article/view/235bacillus subtilispozzolanic additivesself-healingcracksconcretemortar |
| spellingShingle | T. N. Chernykh K. A. Gorbachevskykh M. V. Kriushin A. A. Orlov M. V. Komelkova P. O. Platkovskii Biomineral additives for self-healing of concrete Vestnik MGSU bacillus subtilis pozzolanic additives self-healing cracks concrete mortar |
| title | Biomineral additives for self-healing of concrete |
| title_full | Biomineral additives for self-healing of concrete |
| title_fullStr | Biomineral additives for self-healing of concrete |
| title_full_unstemmed | Biomineral additives for self-healing of concrete |
| title_short | Biomineral additives for self-healing of concrete |
| title_sort | biomineral additives for self healing of concrete |
| topic | bacillus subtilis pozzolanic additives self-healing cracks concrete mortar |
| url | https://www.vestnikmgsu.ru/jour/article/view/235 |
| work_keys_str_mv | AT tnchernykh biomineraladditivesforselfhealingofconcrete AT kagorbachevskykh biomineraladditivesforselfhealingofconcrete AT mvkriushin biomineraladditivesforselfhealingofconcrete AT aaorlov biomineraladditivesforselfhealingofconcrete AT mvkomelkova biomineraladditivesforselfhealingofconcrete AT poplatkovskii biomineraladditivesforselfhealingofconcrete |