Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks.
The creation of cracks, which are the most common cause of structural failure, has a significant impact on the structure's strength and durability. As a result, effective repair and maintenance are vital and unavoidable for treating any of these issues. Self-healing mortar holds promising bene...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2021-12-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/3320 |
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| author | Mohamed Ahmed Refat El-Mahdy Ahmed ELShami Mohamed Yousry Elshikh Seleem Saleh Elsayed Ahmad |
| author_facet | Mohamed Ahmed Refat El-Mahdy Ahmed ELShami Mohamed Yousry Elshikh Seleem Saleh Elsayed Ahmad |
| author_sort | Mohamed Ahmed Refat El-Mahdy |
| collection | DOAJ |
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The creation of cracks, which are the most common cause of structural failure, has a significant impact on the structure's strength and durability. As a result, effective repair and maintenance are vital and unavoidable for treating any of these issues. Self-healing mortar holds promising benefits for reducing the cost of repair as cracks are autonomously repaired without any human intervention. This study investigated the effect of bacteria type, bacteria content, bacteria concentration, and nutrient type on the properties of the self-healing mortar. Three types of bacteria, Bacillus sphaericus, Bacillus Megaterium, and Bacillus subtilis encapsulated in calcium alginate beads, were introduced into the mortar. Two concentrations of bacteria, 2× 108 and 2× 109 Colony Forming Units per milliliter, and different percentages of bacteria of cement weight were selected for the study. In addition, calcium lactate and calcium acetate were used at 0.5% of cement weight as nutrition for bacteria. Tests were performed for compressive strength, bending strength, SEM, EDX, and TGA/DTG. The results show a significant development in the mechanical behaviour of mortar, especially with Bacillus Megaterium using a 2.5% bacterial proportion with a concentration 2× 109 CFU/ml. This can be related to the filling of voids and cracks in microbial mortar by calcite, which was confirmed by SEM and EDX.
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| format | Article |
| id | doaj-art-0e5c171aa61341b48a0f55ddfe13d48b |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2021-12-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-0e5c171aa61341b48a0f55ddfe13d48b2025-01-03T01:50:52ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932021-12-011659Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks.Mohamed Ahmed Refat El-Mahdy0Ahmed ELShami1Mohamed Yousry Elshikh2Seleem Saleh Elsayed Ahmad 3Misr Higher Institute of Eng. & Tech, Elmansura, Egypt Housing & Building National Research Centre, Dokki, Giza, EgyptFaculty of engineering, El mansura University, EgyptFaculty of engineering, Zagazig University, Egypt The creation of cracks, which are the most common cause of structural failure, has a significant impact on the structure's strength and durability. As a result, effective repair and maintenance are vital and unavoidable for treating any of these issues. Self-healing mortar holds promising benefits for reducing the cost of repair as cracks are autonomously repaired without any human intervention. This study investigated the effect of bacteria type, bacteria content, bacteria concentration, and nutrient type on the properties of the self-healing mortar. Three types of bacteria, Bacillus sphaericus, Bacillus Megaterium, and Bacillus subtilis encapsulated in calcium alginate beads, were introduced into the mortar. Two concentrations of bacteria, 2× 108 and 2× 109 Colony Forming Units per milliliter, and different percentages of bacteria of cement weight were selected for the study. In addition, calcium lactate and calcium acetate were used at 0.5% of cement weight as nutrition for bacteria. Tests were performed for compressive strength, bending strength, SEM, EDX, and TGA/DTG. The results show a significant development in the mechanical behaviour of mortar, especially with Bacillus Megaterium using a 2.5% bacterial proportion with a concentration 2× 109 CFU/ml. This can be related to the filling of voids and cracks in microbial mortar by calcite, which was confirmed by SEM and EDX. https://www.fracturae.com/index.php/fis/article/view/3320Self-healing mortarBacillus familyBacterial concentrationNutrientCalcite PrecipitateCrack filling |
| spellingShingle | Mohamed Ahmed Refat El-Mahdy Ahmed ELShami Mohamed Yousry Elshikh Seleem Saleh Elsayed Ahmad Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks. Fracture and Structural Integrity Self-healing mortar Bacillus family Bacterial concentration Nutrient Calcite Precipitate Crack filling |
| title | Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks. |
| title_full | Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks. |
| title_fullStr | Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks. |
| title_full_unstemmed | Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks. |
| title_short | Self-healing mortar using different types, content, and concentrations of bacteria to repair cracks. |
| title_sort | self healing mortar using different types content and concentrations of bacteria to repair cracks |
| topic | Self-healing mortar Bacillus family Bacterial concentration Nutrient Calcite Precipitate Crack filling |
| url | https://www.fracturae.com/index.php/fis/article/view/3320 |
| work_keys_str_mv | AT mohamedahmedrefatelmahdy selfhealingmortarusingdifferenttypescontentandconcentrationsofbacteriatorepaircracks AT ahmedelshami selfhealingmortarusingdifferenttypescontentandconcentrationsofbacteriatorepaircracks AT mohamedyousryelshikh selfhealingmortarusingdifferenttypescontentandconcentrationsofbacteriatorepaircracks AT seleemsalehelsayedahmad selfhealingmortarusingdifferenttypescontentandconcentrationsofbacteriatorepaircracks |