Low alkali sulpho-aluminate cement encapsulated microbial spores for self-healing cement-based materials

Zheng, Tao; Su, Yilin; Qian, Chunxiang; Zhou, Hengyi

doi:10.1016/j.bej.2020.107756

Cited by 43 publications

(9 citation statements)

References 42 publications

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“…Figure shows the compressive strength of different kinds of concrete at different curing ages. Compared with the reference group, it could be seen that the compressive strength of the spore group at different curing ages was improved, which was consistent with the previous reports. ,− This might be due to the fact that calcium nitrate had the effect of early strength, and microbial spores could be filled in the pores of concrete to improve the compactness of the concrete matrix, which caused the improvement of compressive strength. However, for the microbial group, the early-age compressive strength of concrete was slightly higher than that of the reference group (3, 7 days), but with the increase of curing age (14, 28 days), the later-age compressive strength of concrete was slightly lower than that of the reference group, which was consistent with the references. , The reasons could be because the early strength of the carrier was higher, and then with the increase of curing age, the grain strength of the microbial self-healing agent was insufficient to meet the development of the later-age strength of concrete, finally causing the decrease of the later-age compressive strength of concrete.…”

Section: Resultssupporting

confidence: 89%

“…Finally, the repair area of the crack was selected for pixel statistics, and the area repair ratio could be calculated according to the proportion of the crack area pixel to the initial crack pixels after 28 days of healing time. The calculation equation is as follows: − where A 0 is the number of crack area pixel dots before healing and A 28 is the number of crack area pixel dots after 28 days of healing time.…”

Section: Methodsmentioning

confidence: 99%

“…However, for the microbial group, the early-age compressive strength of concrete was slightly higher than that of the reference group (3, 7 days), but with the increase of curing age (14, 28 days), the later-age compressive strength of concrete was slightly lower than that of the reference group, which was consistent with the references. 44,53 The reasons could be because the early strength of the carrier was higher, and then with the increase of curing age, the grain strength of the microbial self-healing agent was insufficient to meet the development of the later-age strength of concrete, finally causing the decrease of the later-age compressive strength of concrete.…”

Section: Compressive Strengthmentioning

confidence: 99%

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Effect and Mechanism of Encapsulation-Based Spores on Self-Healing Concrete at Different Curing Ages

Zheng

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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It has become an intelligent and environmental protection method to repair concrete cracks based on microbial-induced calcium carbonate precipitation (MICP). However, due to the high-alkali environment in concrete, even the microbial spores with strong alkali resistance find it difficult to survive for a long time, which affects the long-term self-healing effect of concrete cracks. In this paper, low-alkali sulfo-aluminate cement (SC) was used as a carrier to encapsulate spores, and the effects of the spore group and microbial group on the basic performances of concrete were studied. Then, the area repair ratio, water permeability, the repair ratio of anti-chloride ion penetration, and ultrasonic velocity were used to evaluate the self-healing efficiency of cracks, and the self-healing effects of two kinds of microbial self-healing agents on concrete cracks with different curing ages were further studied. Moreover, the growth, enzyme activity, and microbial morphologies of spores with and without encapsulation immersed in the simulated pore solution of cement-based materials at different times were studied to discuss the protective effect of the carrier on spores. Compared with the reference group, the results showed that the addition of two microbial self-healing agents would slightly affect the basic performances of concrete, but both were within the control range of concrete materials. For the early-age cracks, the two kinds of microbial self-healing agents could achieve a good self-healing effect, but for the later-age cracks, the concrete cracks of the microbial group could still be repaired well, while the self-healing effect of the spore group was greatly reduced. Moreover, the white precipitates generated at the crack mouth were all calcite CaCO3. In addition, the self-healing mechanism of different microbial self-healing agents on concrete cracks was discussed carefully. This study provides a new idea and method for the engineering application of microbial self-healing concrete.

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Section: Resultssupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Compressive Strengthmentioning

confidence: 99%

See 1 more Smart Citation

Effect and Mechanism of Encapsulation-Based Spores on Self-Healing Concrete at Different Curing Ages

Zheng

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

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“…Also, internal cracks in the concrete are not easily inspected and repaired in a timely manner [ 11 ]. Therefore, the research of self-repairing materials for cracks in cement-based materials has attracted considerable attention [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Electromagnetic-Induced Rupture Microcapsules for Self-Repairing Mortars

Zhuang

et al. 2022

Materials

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Cement-based materials are susceptible to internal cracks during service, leading to a reduction in their durability. Microcapsules can effectively self-repair cracks in cement-based materials. In this study, novel electromagnetic-induced rupture microcapsules (DWMs) were prepared by using the melt dispersion method with Fe3O4 nano-particles/polyethylene wax as the shell and epoxy resin as the repairing agent. The core fraction, compactness, particle size distribution, morphology, and chemical structure of DWMs were characterized. DWMs were subsequently incorporated into the mortar to measure the pore size distribution, compressive strength recovery, and maximum amplitudes of the pre-damaged mortar after self-repairing. DWMs were also evaluated for their ability to self-repair cracks on mortar surfaces. The results showed that the core fraction, remaining weight (30 days), and mean size of DWMs were 72.5%, 97.6 g, and 220 μm, respectively. SEM showed that the DWMs were regular spherical with a rough surface and could form a good bond with cement matrix. FTIR indicated that the epoxy resin was successfully encapsulated in the Fe3O4 nano-particles/polyethylene wax. After 15 days of self-repairing, the harmful pore ratio, compressive strength recovery, and maximum amplitude of the pre-damaged mortars were 48.97%, 91.9%, and 24.03 mV, respectively. The mortar with an initial crack width of 0.4–0.5 mm was self-repaired within 7 days. This indicated that the incorporation of DWMs can improve the self-repair ability of the mortar. This work is expected to provide new insights to address the mechanism of microcapsule rupture in self-repairing cement-based materials.

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“…Feng J et al [3,[6][7][8][9][10] found that some microorganisms in nature can use their own life activities to induce calcium carbonate deposition. Stocks et al [11] have studied that B. pasteurii can induce calcium carbonate deposition in sandy soil test, and the reaction conditions of microorganism induced carbonate precipitation are mild, environment-friendly and excellent compatibility, which has a positive effect on ecological balance.…”

Section: Introductionmentioning

confidence: 99%

Investigation on mineralization performance and spore germination conditions of calcium carbonate mineralizing bacteria

Hu¹,

Liu²,

Zhang³

et al. 2022

Mater. Res. Express

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Microbial induced calcium carbonate precipitation (MICP) provides a theoretical basis for repairing underground rocks. The optimal germination conditions and mineralization activities of Bacillus pasteurii with crack repair function were investigated. The growth and mineralization properties of microorganisms in different environments were explored by measuring the urease activity and calcium carbonate production of bacteria, and the influencing factors of bacterial biomass and urease activity were analyzed. The microscopic morphology of bacterial mineralization products was analyzed by SEM, XRD and TG-DSC test. The influencing factors of spore germination rate were studied by measuring the OD value of spore germination. The results showed that under the conditions of pH 7.3, urea concentration 0.25–0.5 mol l−1, and calcium ion concentration 0.4–0.6 mol l−1, the mineralization activity of B. pasteurii was the strongest, and the generated mineralization product was a stable calcite crystal. The optimum concentration of germination agent and inorganic salt were 10 mmol l−1 and 200 mmol l−1, respectively.

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Low alkali sulpho-aluminate cement encapsulated microbial spores for self-healing cement-based materials

Cited by 43 publications

References 42 publications

Effect and Mechanism of Encapsulation-Based Spores on Self-Healing Concrete at Different Curing Ages

Effect and Mechanism of Encapsulation-Based Spores on Self-Healing Concrete at Different Curing Ages

Preparation and Characterization of Electromagnetic-Induced Rupture Microcapsules for Self-Repairing Mortars

Investigation on mineralization performance and spore germination conditions of calcium carbonate mineralizing bacteria

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