Optimization of a Binary Concrete Crack  Self-Healing System Containing Bacteria and Oxygen

Zhang, Jinlong; Mai, Bixia; Cai, Tingwei; Luo, Jiayi; Wu, Wanhan; Liu, Bing; Han, Ningxu; Xing, Feng; Deng, Xu

doi:10.3390/ma10020116

Cited by 38 publications

(14 citation statements)

References 27 publications

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“…Nevertheless, in a series of recent studies the potential of oxygen releasing compounds, typically peroxides, as part of concrete healing agent formulations were investigated for their potential to increase calcium carbonate precipitation yield by aerobic bacteria under oxygen‐limiting conditions. While calcium peroxide and zinc peroxide appeared inhibitory, urea–hydrogen peroxide and magnesium peroxide were found to stimulate calcium carbonate precipitation in one study, Zhang et al found that calcium peroxidase tablets improved calcium precipitation by bacterial strain H4 at a dosage range of 7.5–12.5 g L −1 …”

Section: Self‐healing Bioconcretementioning

confidence: 99%

A Review of Self‐Healing Concrete for Damage Management of Structures

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

528

278

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The increasing concern for safety and sustainability of structures is calling for the development of smart self-healing materials and preventive repair methods. The appearance of small cracks (<300 µm in width) in concrete is almost unavoidable, not necessarily causing a risk of collapse for the structure, but surely impairing its functionality, accelerating its degradation, and diminishing its service life and sustainability. This review provides the state-ofthe-art of recent developments of self-healing concrete, covering autogenous or intrinsic healing of traditional concrete followed by stimulated autogenous healing via use of mineral additives, crystalline admixtures or (superabsorbent) polymers, and subsequently autonomous self-healing mechanisms, i.e. via, application of micro-, macro-, or vascular encapsulated polymers, minerals, or bacteria. The (stimulated) autogenous mechanisms are generally limited to healing crack widths of about 100-150 µm. In contrast, most autonomous self-healing mechanisms can heal cracks of 300 µm, even sometimes up to more than 1 mm, and usually act faster. After explaining the basic concept for each self-healing technique, the most recent advances are collected, explaining the progress and current limitations, to provide insights toward the future developments. This review addresses the research needs required to remove hindrances that limit market penetration of self-healing concrete technologies.

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Section: Self‐healing Bioconcretementioning

confidence: 99%

A Review of Self‐Healing Concrete for Damage Management of Structures

Belie

Gruyaert

Al‐Tabbaa

et al. 2018

Adv Materials Inter

528

278

View full text Add to dashboard Cite

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“…The utilization of bacteria to fill up the concrete pores or cracks by self-healing process has been reported by authors in the literature [8,9], The technique is used in order to accelerate the precipitation of calcium carbonate (CaCO 3 ) on the bacterial cell wall to increase the compressive and splitting tensile strength as well as reduction in water penetration [8][9][10][11][12][13]. The bacteria increase the formation of CaCO 3 layer as a function for diffusing CO 2(g) through the wet concrete and production of HCO 3 -(aq) as an intermediate product.…”

Section: Introductionmentioning

confidence: 99%

Improvement of mechanical properties of bio-concrete using Enterococcus faecalis and Bacillus cereus

Alshalif

Juki

Othman

et al. 2019

Environmental Engineering Research

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The present study aimed to investigate the potential of Enterococcus faecalis (E. faecalis) and Bacillus cereus (B. cereus) in improving the properties of bio-concrete. E. faecalis and B. cereus strains were obtained from fresh urine and an acid mire water at cell concentration of 1.16×10 12 and 1.3×10 12 cells mL-1 , respectively. The bacterial strains were inoculated in a liquid medium into the concrete with 1, 3 and 5% as replacement of water cement ratio (w/c). The ability of E. faecalis and B. cereus cells to accumulate the calcite and the decrement of pores size within bio-concrete was confirmed by SEM and EDX analysis. The results revealed that E. faecalis exhibited high efficiency for increasing of compressive and splitting tensile strength than B. cereus (23 vs. 14.2%, and 13 vs. 8.5%, respectively). These findings indicated that E. faecalis is more applicable in the bio-concrete due to its ability to enhance strength development and reduce water penetration.

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“…Among these different forms, calcite is the most stable form of calcium carbonate (Rao et al, 2013). The chemical reaction for the formation of calcium carbonate by ''Bacillus subtilis'' microorganisms is shown below in equation 2, in which calcium lactate reacts with oxygen and converted into calcium carbonate, carbon dioxide gas, and water (Zhang et al, 2017) CaC 6 H 10 O 6 + 6O 2 ! CaCO 3 + 5CO 2 + 5H 2 0 ð2Þ Figure 8 shows the microstructure of F-4 having sand as a carrier material.…”

Section: Microstructure Analysismentioning

confidence: 99%

Bio-inspired self-healing cementitious mortar using Bacillus subtilis immobilized on nano-/micro-additives

Khushnood

Din

Shaheen

et al. 2018

Journal of Intelligent Material Systems and Structures

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Bio-inspired self-healing strategies are much innovative and potentially viable for the production of healable cement mortar matrix. The present research explores the feasibility of gram-positive ''Bacillus subtilis'' microorganisms in the effective healing of nano-/micro-scale-induced structural and non-structural cracks. The main concern related to the survival of such microorganisms in cementitious environment has been successfully addressed by devising proficient immobilization scheme coherently. The investigated immobilizing media includes iron oxide nano-sized particles, micro-sized limestone particles, and milli-sized siliceous sand. The effect of induced B. subtilis microorganisms immobilized on nanomicro-additives was analyzed by the quantification of average compressive resistance of specimens (ASTM C109) and healing evaluation. The healing process was mechanically gauged by compressive strength regain of pre-cracked specimens after the healing period of 28 days. The pre-cracking load was affixed at 80% of ultimate compressive stress ''f 0 c '' while the age of pre-cracking was kept variable as 3, 7, 14, and 28 days to precisely correlate healing effectiveness as the function of cracking period. The healing mechanism was further explored by examining the healed micro-crack using field emission scanning electron micrographs, energy dispersive x-ray spectrographs, and thermogravimetry. The results revealed that B. subtilis microorganisms contribute extremely well in the improvement of compressive strength and efficient healing process of pre-cracked cement mortar formulations. The iron oxide nano-sized particles were found to be the most effective immobilizer for preserving B. subtilis microbes till the generation of cracks followed by siliceous sand and limestone particles. The micro-graphical and chemical investigations endorsed the mechanical measurements by evidencing calcite precipitation in the induced nano-/micro-cracks as a result of microbial activity.

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Optimization of a Binary Concrete Crack Self-Healing System Containing Bacteria and Oxygen

Cited by 38 publications

References 27 publications

A Review of Self‐Healing Concrete for Damage Management of Structures

A Review of Self‐Healing Concrete for Damage Management of Structures

Improvement of mechanical properties of bio-concrete using Enterococcus faecalis and Bacillus cereus

Bio-inspired self-healing cementitious mortar using Bacillus subtilis immobilized on nano-/micro-additives

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