Frontiers of Structural and Civil Engineering, Journal Year: 2023, Volume and Issue: 17(11), P. 1630 - 1642
Published: Nov. 1, 2023
Language: Английский
Journal of Materials Research and Technology, Journal Year: 2024, Volume and Issue: 29, P. 2376 - 2395
Published: Feb. 2, 2024
Cracks in concrete structures can significantly decrease their lifespan by exposing reinforcement to outside environment, leading degradation. To address this issue, self-healing techniques have been developed, including biomineralization-based-self healing, where bacteria are employed initiate microbially induced calcium precipitate (MICP), promoting the healing of cracks. This article explores extreme environmental conditions pH and temperature which reduce sustainability potential bacteria. Furthermore, it implementation using aimed at mitigating adverse effects environment on bacteria, thereby enhancing capabilities. Notably, studies found that mechanical strength be increased cell concentrations 105 108 cells/ml. Based review, is depends factors such as temperature, well methods concrete. Moreover, there exists a direct correlation between bacterial concentration alterations properties The incorporation leads increment properties, with enhancement up 42.8 %. Understanding interplay crucial optimizing biomineralization-based durability infrastructure.
Language: Английский
Citations
34
Nature Reviews Microbiology, Journal Year: 2024, Volume and Issue: 22(6), P. 345 - 359
Published: Jan. 22, 2024
Language: Английский
Citations
19
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 947, P. 174553 - 174553
Published: July 6, 2024
The self-healing bioconcrete, or bioconcrete as concrete containing microorganisms with capacities, presents a transformative strategy to extend the service life of structures. This technology harnesses biological capabilities specific microorganisms, such bacteria and fungi, which are integral material's capacity autonomously mend cracks, thereby maintaining structural integrity. review highlights complex biochemical pathways these organisms utilize produce healing compounds like calcium carbonate, how environmental parameters, pH, temperature, oxygen, moisture critically affect repair efficacy. A comprehensive analysis recently published peer-reviewed literature, contemporary experimental research forms backbone this focus on microbiological aspects process. assesses challenges facing including longevity microbial spores cost implications for large-scale implementation. Further, attention is given potential directions, investigating alternative agents optimizing environment support activity. culmination investigation call action integrating in construction broader scale, realizing its fortify infrastructure resilience sustainability.
Language: Английский
Citations
14
Engineering materials, Journal Year: 2025, Volume and Issue: unknown, P. 253 - 276
Published: Jan. 1, 2025
Language: Английский
Citations
1
Construction and Building Materials, Journal Year: 2023, Volume and Issue: 409, P. 134108 - 134108
Published: Nov. 20, 2023
Crystalline admixture (CA) has garnered attention as a promising self-healing agent for cementitious composites. This paper aims to provide compressive review on the effects of CA behaviours and durability properties is in powder form, consisting Portland cement special chemicals stimulants. Since powder-form was directly mixed with mixture, addition no significant impact fresh concrete but enhances strength CA-cementitious Furthermore, activated by moisture, resulting production calcium-based products. In terms crack closure efficacy, specimens cured under wet/dry cycle demonstrated higher ratio than those water immersion or air exposure. Specimens chloride solution exhibited best healing recovery. However, reduced mechanical recoveries are observed exposed freeze–thaw cycles solution, while better found cycles. Overall, can reduce sorptivity, permeability, penetration, depth sodium ions offering favourable protection Although some composites have been explored, further studies required investigate potential shrinkage, ingress aggressive ions, carbonation, alkali-silica reaction (ASR). The application could be considered cost-effective approach inducing capability, given its affordable straightforward construction process.
Language: Английский
Citations
17
Developments in the Built Environment, Journal Year: 2024, Volume and Issue: 17, P. 100331 - 100331
Published: Jan. 14, 2024
This study explores the potential impact of natural soil on concrete crack self-healing in sub-surface structures. Three types pre-cracked cement mortar samples were prepared for laboratory experiments, with some inoculated bacterial healing agents, others supplemented nutrients to attract indigenous bacteria, and plain served as controls. The placed within saturated under two conditions: slightly organic sterilised soil. After 100 days, closure was evaluated through microscopic inspection, water absorption tests, SEM-EDX scanning. results indicated calcite precipitation surfaces across all samples, but varying ratios (16%–81%). Notably, most incubated exhibited an overall increase (up 59.4%) ratio compared those soil, highlighting microorganisms their microbial activity enhancing biogenic mineral thus protecting
Language: Английский
Citations
6
Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 91, P. 109669 - 109669
Published: May 20, 2024
Language: Английский
Citations
6
Construction and Building Materials, Journal Year: 2024, Volume and Issue: 439, P. 137238 - 137238
Published: July 6, 2024
Language: Английский
Citations
5
Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 91, P. 109598 - 109598
Published: May 10, 2024
Language: Английский
Citations
4
Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown
Published: June 25, 2024
Promising many societal benefits, emergent products of biotechnology involve releasing genetically modified microbes (GMMs) into the environment.However, regulatory challenges limit their use.So far, GMMs have mainly been tested in agriculture and environmental cleanup, with few approved for commercial purposes.Current government regulations inadequately address modern genetic engineering potential gut therapeutics, skin products, self-repairing materials, ocean pollution treatment, anti-corrosion coatings, etc.This review first describes current U.S. engineered bacterial release.We analyze 57 global studies on soil-released laboratory microcosm experiments.We discuss behavior released bacteria offer guidelines to improve performance, control persistence, reduce risk.Advanced technologies that GMM function control, but lead increases scrutiny, are reviewed.Finally, we propose a new framework informed by recent data maximize benefits rapidly risks. v Box 1: Commercial releases bacteriaTo our knowledge, these examples only use.The example was not per se, it deployed field outside testing area perform its function.Supplementary Tables 2-3 describe published trials, most those commercially developed.Randomly-mutagenized included.Stopping Crown Gall disease trees antibiotic-producing bacteria.The pathogen Agrobacterium tumefaciens colonizes woody perennials, causing abnormal growth roots branches.It is killed agrocin, produced radiobacter K1026 29 , genes encoded plasmid, raising HGT concerns.Therefore, plasmid tra gene knocked out eliminate conjugative transfer 30 .In Australia 1988, became world's commercially-approved release.It 2000 United States 31 .Image crown gall taken Scot Nelson, creative commons license.Phenol remediated Pseudomonas putida.Phenol potent carcinogen due an 81-day fire at largest oil shale mine U.S.S.R. (now Estonia) 1988.Engineered P. putida containing recombinant phenol-degrading pathway spread remediate 32,33 .The were inoculated enclosures where reduced phenol levels 700-fold.Image showing diagram (6; location started), adapted from ref 34 .Bio-insecticides based Bacillus thuringiensis targeted pest control.B. produces proteins kill insects wild-type strains used bio-insecticide globally 35,36 .These disrupt different pests through variations endotoxins they produce (Cry proteins), strain may optimal combination toxins particular 36 .Mycogen Corporation developed M-Cap cloning Bt toxin B. fluorescens, facilitate use maize crops 37 before field.M-Cap 1990.Other similar developed, including prior release 22,[38][39][40] Stem borers, sensitive M-Cap, International Maize Wheat Improvement Center, license.Nitrogenous fertilizer delivery consortium.Nitrogenous consumes 2% energy major contributor runoff greenhouse gases 41 .Microbes do fixed N when conjunction synthetic unless engineered.In 1990s, Rhizobium meliloti got EPA approval legumes, never commercialized.In 2019, Pivot Bio commercialized Klebsiella variicola deliver nitrogen corn, later consortium adding Kosakonia sacchari.Their product millions acres replaced estimated 32,000 tons 2022 42 courtesy Bio.Engineered subtilis probiotic treating hangovers.Enzyme-based therapeutics often suffer inactivation stored or consumed.Activity could be improved if site needed body.Zbiotic over-thecounter liquid drink contains designed degrade gut-derived acetaldehyde builds up colon after consuming alcohol.The sale nearly 4 million bottles circulation as April 2024.Image Zbiotics.Oral cavity-reducing Streptococcus mutans lactic acid.Biofilms can cause dental cavities producing acid.An isolate S. found antibiotic mutacin 1140, increasing ability outcompete native colonize teeth 43 this strain, lactate dehydrogenase alcohol Zymomonas mobilis, using allelic exchange.The resulting stopped acid 44 .It one-time application cavity formation.While trying approve early 2000s oral therapeutic, FDA put constraints trial which completed.In 2023, Latern Bioworks brought market "cosmetic" avoid need permit.Image decay bacteria.By
Language: Английский
Citations
4