Assessment of Biogenic Healing Capability, Mechanical Properties, and Freeze–Thaw Durability of Bacterial-Based Concrete Using Bacillus subtilis, Bacillus sphaericus, and Bacillus megaterium DOI Creative Commons
Izhar Ahmad, Mehdi Shokouhian,

David Owolabi

и другие.

Buildings, Год журнала: 2025, Номер 15(6), С. 943 - 943

Опубликована: Март 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.

Язык: Английский

Assessment of Biogenic Healing Capability, Mechanical Properties, and Freeze–Thaw Durability of Bacterial-Based Concrete Using Bacillus subtilis, Bacillus sphaericus, and Bacillus megaterium DOI Creative Commons
Izhar Ahmad, Mehdi Shokouhian,

David Owolabi

и другие.

Buildings, Год журнала: 2025, Номер 15(6), С. 943 - 943

Опубликована: Март 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.

Язык: Английский

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