Living concrete with self-healing function on cracks attributed to inclusion of microorganisms: Theory, technology and engineering applications—A review

Qian, Chunxiang; Zheng, Tao; Yang, Rui

doi:10.1007/s11431-021-1879-6

Cited by 23 publications

(4 citation statements)

References 47 publications

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“…In the field of geotechnical engineering, the research results of MICP on soil improvement can be used for foundation reinforcement [ 57 , 58 , 59 ], earth dam reinforcement [ 60 ], wind prevention, sand fixation [ 61 ], reservoir bottom anti-seepage, and anti-seepage curtains [ 42 ]. In the field of agricultural production and construction, MICP technology also plays a beneficial role in improving soil mass, such as water and soil conservation, the prevention of water and soil loss [ 62 ], and stability improvement in agricultural water conservancy projects [ 63 ] and agricultural buildings [ 64 ], which is conducive to planting and production activities and also ensures safety. Testing the mechanical properties of the cemented samples can not only measure the quality of the cementation effect but can also determine the feasibility of using the MICP technology based on urea hydrolysis to improve the soil.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Sun

Zhong

et al. 2023

Microorganisms

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At present, in the field of geotechnical engineering and agricultural production, with increasingly serious pollution an environmentally friendly and efficient means is urgently needed to improve the soil mass. This paper mainly studied the microbial induced calcium carbonate precipitation (MICP) technology and the combined effect of MICP technology and lignin on the improvement of silt in the Beijing area. Through unconfined compressive strength and dynamic triaxial test methods, samples improved by microorganisms were studied to obtain the optimal values of cement concentration and lignin under these two test schemes. The results show that after the incubation time of Sporosarcina pasteurii reached 24 h, the OD600 value was 1.7–2.0 and the activity value (U) was 930–1000 mM ms/min. In the unconfined static pressure strength test, after MICP treatment the optimal concentration of cementitious solution for constant temperature and humidity samples and constant-temperature immersion samples was 1.25 mol/L. The compressive strength of the constant temperature and humidity sample was 1.73 MPa, and the compressive strength of the constant-temperature immersion sample was 3.62 Mpa. At the concentration of 1.25 mol/L of cement solution, MICP technology combined with lignin could improve the constant temperature and humidity silt sample. The optimal addition ratio of lignin was 4%, and its compressive strength was 1.9 MPa. The optimal lignin addition ratio of the sample soaked at a constant temperature was 3%, and the compressive strength was 4.84 MPa. In the dynamic triaxial multi-stage cyclic load test, the optimal concentration of cementation solution for the constant temperature and humidity sample after MICP treatment was 1.0 mol/L, and the failure was mainly inclined cracks. However, in the condition of joint improvement of MICP and lignin, the sample mainly had a drum-shaped deformation, the optimal lignin addition ratio was 4%, and the maximum axial load that the sample could bear was 306.08 N. When the axial dynamic load reached 300 N, the strain accumulation of the 4% group was only 2.3 mm. In this paper, lignin, an ecofriendly material, was introduced on the basis of MICP technology. According to the failure shape and relevant results of the sample, the addition of lignin was beneficial for the improvement of the compressive strength of the sample.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Sun

Zhong

et al. 2023

Microorganisms

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“…Self-healing is the process of a healing agent being added to concrete, which then flls cracks when they are created. Current commonly used healing methods include the epoxy resin method, microcapsule method, mineral admixture method, and microbial method [12]. In comparison to other crack repair methods, the microbial method has the advantages of green environmental protection and convenient construction.…”

Section: Introductionmentioning

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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“…Concretes are very prone to cracks because of their quasibrittle nature [1][2][3][4][5][6] and these cracks provide a passage to penetrate the chloride and sulfate ions, causing corrosion of reinforced steel and degradation of the concrete. [7][8][9] Throughout their life span, the serviceability of the building may significantly degrade. The phenomenon of selfhealing cracks in concrete provides a novel and potential solution for enhancing the durability of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

“…Concretes are very prone to cracks because of their quasi‐brittle nature 1–6 and these cracks provide a passage to penetrate the chloride and sulfate ions, causing corrosion of reinforced steel and degradation of the concrete 7–9 . Throughout their life span, the serviceability of the building may significantly degrade.…”

Section: Introductionmentioning

confidence: 99%

Effects of bacterial consortium enhanced recycled coarse aggregates on self‐healing concrete immobilized with Bacillus megaterium MTCC 1684 and Bacillus subtilis NCIM 2193

Bakr,

Hussain,

Singh

et al. 2023

Structural Concrete

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The strength and durability properties of the recycled aggregate concrete (RAC) have been affected by the cracks and the weak interfacial transition zone (ITZ) of the recycled coarse aggregates (RCA). However, the mechanical and physical features of RCA can be improved by microbially induced calcite precipitation (MICP). Therefore, immobilization techniques were used to protect and maintain the high efficiency of Bacillus bacteria for the formation and precipitation of calcium carbonates in self‐healing concrete over a period of time. The objective of the present study was to show the viability of the immobilized bacterial consortium‐enhanced RCA to form self‐healing cracks. Further, the self‐healing capability of enhanced RCA was investigated along with two other immobilization methods, that is, RCA and hydrated lime and brick powder (HBr)‐immobilized bacteria. The experimental results show that the increase in the bio‐deposition time improved the physical and mechanical properties of the RCA. Further, subsequently 56 days of the healing incubation period, the immobilized consortium‐enhanced RCA concrete specimens completely healed the cracks of width 0.58 mm. However, the equivalent cracks of width 0.56 mm were also recovered by the HBr immobilized bacterial cultures. Furthermore, the field emission scanning electron microscope (FESEM), energy dispersive spectroscopy (EDS) and X‐ray diffraction (XRD) analysis revealed that the existence of precipitation at the crack surface was calcium carbonate with a regular cubic‐shaped and lamellar layer morphology. The outcomes of the current study show that consortium‐enhanced RCA has promising potential to develop self‐healing concrete with self‐repaired and improved durability properties in the concrete construction field.

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Living concrete with self-healing function on cracks attributed to inclusion of microorganisms: Theory, technology and engineering applications—A review

Cited by 23 publications

References 47 publications

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Experimental Study on Silt Soil Improved by Microbial Solidification with the Use of Lignin

Carriers of Healing Agents in Biological Self-Healing Concrete

Effects of bacterial consortium enhanced recycled coarse aggregates on self‐healing concrete immobilized with Bacillus megaterium MTCC 1684 and Bacillus subtilis NCIM 2193

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