Viability determination of Bacillus sphaericus after encapsulation in hydrogel for self-healing concrete via microcalorimetry and in situ oxygen concentration measurements

Several methods have been proposed currently for evaluating the crack width of a mortar specimen. Among these, the water permeability test is widely used to estimate crack width because water permeability is directly related to the average crack width of a specimen through which water passes. However, the viscosity of water makes precise crack width measurement challenging. The possible inflow (outflow) of foreign (healing) substances could affect the test results. To circumvent this limitation, this study proposes a gas diffusion test using oxygen rather than water as the medium. The proposed method includes a process that could compensate for gas diffusion from specimen parts other than the crack, allowing for a more precise estimation of crack width. The crack width can indeed be estimated with an error of 4% or less.

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“…A specimen with a specified crack width can be created in multiple ways [ 21 , 22 , 23 ]. Basically, a splitting tensile test is utilized.…”

Section: Experimental Programmentioning

confidence: 99%

Crack Width Evaluation of Cracked Mortar Specimen Using Gas Diffusion Characteristics

2023

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“…Tis is then combined with CO 3 2which is produced by microbial metabolism, and CaCO 3 mineral precipitation is formed. As shown in Figure 10, there are two ways in which microorganisms can metabolise the biological mineral calcium carbonate: microorganisms generate CO 2 during metabolism and CO 2 combines with Ca(OH) 2 in the matrix to form CaCO 3 deposition or microorganisms directly metabolise calcium-containing substances to form CaCO 3 mineral deposits [52,53]. Te resulting CaCO 3 is deposited continuously and cracks in the concrete are repaired.…”

Section: Microcapsule-type Protective Carriermentioning

confidence: 99%

Carriers of Healing Agents in Biological Self-Healing Concrete

Tan

Ding

2023

Advances in Materials Science and Engineering

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Concrete is the most widely used material in civil engineering, but due to its inherent brittleness, the generation of cracks easily occurs. Crack healing is an effective method for restoring the mechanical properties of concrete and improving its durability. Of all the current concrete crack healing methods, microbial-induced calcium carbonate precipitation technology is an incredibly promising crack self-healing strategy that has received widespread attention in the field of concrete crack repair. As the biological self-healing agent has difficulty resisting the high alkali and high calcium environment in concrete, protection is required when it is used in concrete cracks.

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“…The bacterial spores were prepared as described in our previous work [22]. The mix design with addition of both bacterial self-healing agents in mortar can be found in J o u r n a l P r e -p r o o f In this test, specimens were incubated in two healing conditions: wet-dry and water immersion (triplicate samples of each series).…”

Section: Crack-closure Potential Of Cpb Compared To Ureolytic Bacillu...mentioning

confidence: 99%

Production of calcium carbonate-precipitating biomass powder as self-healing additive in concrete and performance evaluation in mortar

Zhu

Sakarika

Ganigué

et al. 2023

Cement and Concrete Composites

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Viability determination of Bacillus sphaericus after encapsulation in hydrogel for self-healing concrete via microcalorimetry and in situ oxygen concentration measurements

Cited by 44 publications

References 28 publications

Crack Width Evaluation of Cracked Mortar Specimen Using Gas Diffusion Characteristics

Crack Width Evaluation of Cracked Mortar Specimen Using Gas Diffusion Characteristics

Carriers of Healing Agents in Biological Self-Healing Concrete

Production of calcium carbonate-precipitating biomass powder as self-healing additive in concrete and performance evaluation in mortar

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