State-of-the-art review on advancements of eco-friendly bacterial-infused self-healing concrete for sustainable constructions

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 91, P. 109669 - 109669

Published: May 20, 2024

Language: Английский

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Assessment of Biogenic Healing Capability, Mechanical Properties, and Freeze–Thaw Durability of Bacterial-Based Concrete Using Bacillus subtilis, Bacillus sphaericus, and Bacillus megaterium

Buildings, Journal Year: 2025, Volume and Issue: 15(6), P. 943 - 943

Published: March 17, 2025

Microbial-induced carbonate precipitation technology allows concrete to detect and diagnose cracks autonomously. However, the concrete’s compact structure alkaline environment necessitate adoption of a proper carrier material safeguard microorganisms. In this study, various bacterial strains, including Bacillus subtilis, sphaericus, megaterium, were immobilized in lightweight expanded clay aggregates (LECA) investigate their effect on self-healing performance, mechanical strength, freeze–thaw durability. Self-healing specimens prepared using LECA, directly added spores, polyvinyl acetate (PVA) fibers, air-entraining admixture (AEA). The pre-cracked prisms monitored for 224 days assess efficiency through ultrasonic pulse velocity (UPV) surface crack analysis methods. A compressive strength restoration test was conducted by pre-loading cube with 60% failure load re-testing them after 28 regain. Additionally, X-ray diffraction scanning electron microscopy (SEM) analyze precipitate material. findings revealed that improved biomineralization activity over healing period demonstrated strains. Compression flexural strengths decreased attributed porous LECA. compression durability significantly mixes compared control reference mixes. XRD SEM analyses confirmed formation calcite as precipitate. Overall, results indicated superior performance megaterium followed sphaericus subtilis. current study provide important insights construction industry, showcasing potential bacteria mitigate degradation structures advocating sustainable solution reduces reliance manual repairs, especially inaccessible areas structures.

Language: Английский

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Optimizing of Self-Compacting Concrete (SCC): Synergistic Impact of Marble and Limestone Powders—A Technical and Statistical Analysis

Buildings, Journal Year: 2025, Volume and Issue: 15(7), P. 1043 - 1043

Published: March 24, 2025

The disposal and recycling of industrial by-products such as marble limestone powders pose pressing environmental challenges due to the substantial amounts waste generated annually by processing plants quarries. integration these into concrete production is justified their widespread availability potential alleviate burden. This study used a statistical mixture design approach systematically assess effects powders, with varying fineness levels, partial cement replacements (up 17%) on rheological mechanical properties self-compacting (SCC). experimental findings revealed that density SCC mixtures ranged from 2475 2487 kg/m3. Mixtures incorporating powder exhibited superior flowability, achieving slump flow up 69 cm, an 8% improvement compared those containing powder. However, specific surface area 330 m2/kg demonstrated significant improvements in compressive tensile strengths, increases 18%. Statistical analysis using variance (ANOVA) validated reliability predictive models developed, which coefficients determination (R2) exceeded 0.94 p-values below 0.05. These enable precise predictions critical performance metrics, including density, flow, box strength, thus reducing need for extensive procedures.

Language: Английский

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Prediction of self-healing ability and compressive strength of bacterial-based self-healing concrete using direct method of ultrasonic pulse velocity test

Nondestructive Testing And Evaluation, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 17

Published: March 25, 2025

Language: Английский

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A study on the effective utilization of ultrafine fly ash and silica fume content in high-performance concrete through an experimental approach

Heliyon, Journal Year: 2024, Volume and Issue: 10(22), P. e39678 - e39678

Published: Oct. 22, 2024

Conventional cement production is a major source of CO

Language: Английский

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Investigating stability, homogeneity, and bleeding in self-compacting concrete: new experimental analysis

European Journal of Environmental and Civil engineering, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 15

Published: Dec. 31, 2024

Self-compacting concrete (SCC) represents a significant advancement in technology, providing solutions to traditional challenges associated with placement. Despite its many advantages, SCC faces difficulties maintaining coherence, stability, and resistance segregation. This study examines the properties behaviors of SCC, focusing on homogeneity, bleeding, their relationships various rheological parameters. The research uses experimental analysis correlation studies elucidate these phenomena. In this work, we employed new tools assess water accumulation due bleeding evaluate stability homogeneity using ultrasonic velocity method. Experimental regression analyses further robust relationship between parameters characteristics, valuable information for optimization mixtures.

Language: Английский

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