Bacteria-based self-healing of cement mortars loaded at different levels and exposed to high temperature

Yıldırım, Musa; Özhan, Hacer Bilir; Öz, Hilal Girgin

doi:10.1680/jmacr.22.00238

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…The bridging behaviour of the jute fibres prevented surface shedding, and damaged areas were reattached to the structure owing to the bacteria forming calcite. Previous studies have reported that Bacillus megaterium can successfully produce calcite [23][24][25]. The findings of the present study also revealed that Bacillus megaterium species, which were not used previously in studies using the fibre encapsulation method, could also be used to successfully produce calcite.…”

Section: Physical Healingsupporting

confidence: 64%

Production of Self-Healing Mortar Using Bacterial Spores Encapsulated With Jute Fibre

Yıldırım,

Özhan,

ÖZ

2023

ACAE

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Cement-based composites have various advantages such as low cost, easy shaping, and high compressive strength. Therefore, they are widely used in the construction industry. However, their brittle structure makes them prone to cracking, which must be repaired promptly to avoid possible loss of strength and durability and ultimate structural failures. Microbially-induced calcite precipitation (MICP) offers an effective method for healing these cracks. Unlike other treatments, MICP method is a natural and environment-friendly option for self-healing of cracks. However, bacteria can be damaged by cement and mechanical impacts; therefore, encapsulation is necessary to protect them. Encapsulation in fibres is a simpler and more cost-effective method than the other techniques. This study tested the effectiveness of encapsulating Bacillus megaterium spores in jute fibres and added them to cement-based mortars. Different nutrient supplements were used, and physical analyses and compressive strength tests were conducted on 28-day cured cube specimens. Present findings revealed that Bacillus megaterium-type bacteria encapsulated in jute fibres improved the compressive strength recovery and healed the loading-induced cracks.

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Section: Physical Healingsupporting

confidence: 64%

Production of Self-Healing Mortar Using Bacterial Spores Encapsulated With Jute Fibre

Yıldırım,

Özhan,

ÖZ

2023

ACAE

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“…In previous studies (Yildirim et al, 2023;Qian et al, 2021), it had been observed that similar widths of cracks had been repaired with the MICP method. Slight differences were mainly attributed to different species of bacteria and to the conditions present in healing the cracks.…”

Section: Formation Of Caco 3 and Healing Of Cracksmentioning

confidence: 99%

Repair of Cracks in Concrete with the Microbial-Induced Calcite Precipitation (MICP) Method

Özhan,

Yildirim,

Öğüt

et al. 2023

Slovak Journal of Civil Engineering

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In this study, the microbiologically-induced calcium carbonate precipitation (MICP) method was employed to examine its potential for repairing cracks in concrete. In addition, specific gravity and porosity values were measured to examine the effect of calcite formations on concrete surfaces and microstructures. Bacteria-supplemented concrete repaired cracks up to 0.4 mm wide by filling them with CaCO3. Furthermore, this study not only examined the healing of the width but also the length of cracks. However, as the width of the treated cracks decreased, their length increased. This indicated that the MICP treatment is more effective in a limited crack range. Specific gravity values increased, and porosity values decreased in concrete supplemented with calcifying bacteria. SEM analyses showed that calcite is a bacterial product that forms a very tight bond with a cement gel and that calcite fills visible cracks and voids and creates more of a void-free and undamaged concrete structure.

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“…Bai and Varghese [15] reported that MICP yielded positive outcomes for mineral additives. In addition to improved mechanical properties, bacterial concrete is relatively durable against the effects of hightemperature and acid attacks [16,17]. Bacteria are integrated into cement-based materials through various methods, such as spraying, injection, direct addition to the mixture, use of glass tubes, and impregnation of the mixing materials.…”

Section: Figure 1 Schematic Of Calcium Carbonate Production By Bacteriamentioning

confidence: 99%

Effect of Bacterial Curing and Bacterial Additive on Concrete Properties

Yıldırım,

Özhan

2023

ACAE

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In this study, calcium carbonate was formed on the surfaces and inner structure of concrete using the microbially induced carbonate precipitation method. Bacillus megaterium bacteria were supplemented into the curing water and concrete mixtures. Three types of concrete were tested: control concrete, bacteria-containing concrete, and concrete cured in bacterial liquid. Compressive strength, water absorption, capillary water absorption, scanning electron microscopy (SEM), and mapping analyses were conducted to investigate the effects of bacterial additive or bacterial curing to concrete specimens. Bacteria spore added to the concrete mixture and curing in bacterial media increased the compressive strengths of concrete by up to 9,52 % at the end of 28 days of curing. Bacterial curing and the addition of bacteria spores caused a reduction in water absorption rates owing to changes in the concrete structures. Calcite only formed on the surfaces of the samples treated with bacterial curing liquid, thereby limiting its effect on capillary water absorption. In contrast, capillary water absorption in the bacterial concrete decreased by 50 % compared to the control concrete. The crystalline structures of calcium carbonate and bacterial concrete were analysed through SEM imaging. Mapping analysis revealed that the primary elements of calcite were considerably more concentrated on the surface of bacterial concrete than in the control concrete.

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Bacteria-based self-healing of cement mortars loaded at different levels and exposed to high temperature

Cited by 9 publications

References 24 publications

Production of Self-Healing Mortar Using Bacterial Spores Encapsulated With Jute Fibre

Production of Self-Healing Mortar Using Bacterial Spores Encapsulated With Jute Fibre

Repair of Cracks in Concrete with the Microbial-Induced Calcite Precipitation (MICP) Method

Effect of Bacterial Curing and Bacterial Additive on Concrete Properties

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