Autogenous self-healing of cement with expansive minerals-I: Impact in early age crack healing

Qureshi, Tanvir; Kanellopoulos, Antonios; Al‐Tabbaa, Abir

doi:10.1016/j.conbuildmat.2018.10.143

Cited by 96 publications

(51 citation statements)

References 50 publications

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“…The autogenous healing in younger concrete is possible due to more unhydrated cement. However, it is difficult for autogenous healing at later ages of concrete [8][9][10]. The research on preventing interventions to limit the formation of cracks has been increased in the recent past so as to achieve higher structural performance [11]; further, the monumental response to the degradation of concrete at the micro-level by adding the self-healing materials has also drawn the attention of researchers.…”

Section: Introductionmentioning

confidence: 99%

Self-repairing of concrete cracks by using bacteria and basalt fiber

Vijay

Murmu

2019

SN Appl. Sci.

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Concrete is a most extensively used material in construction; however, cracks in concrete are unavoidable. There is a new technology that can heal the cracks by precipitated calcium carbonate called as microbial self-healing concrete which reduces the coefficient of permeability. The self-healing/self-repairing concrete with the addition of fibers can be used in construction industries to enhance the strength and durability of concrete. Fibers may reduce the crack width by bridging action and bacteria develop a filling material in that bridge portion. This improves the durability and strength of bacterial concrete. In the present study, four different mixes are prepared, namely normal concrete, bacterial concrete, fiber-reinforced concrete, and bacterial concrete, with the addition of fibers. The healing/repairing efficiency of concrete is measured in terms of electrical resistivity and compressive strength of concrete on pre-cracked samples and healed samples. Further, the results are correlated with the scanning electron microscope and energy-dispersive X-ray spectrometer analysis. The results and analysis that carried out show substantial enhancement in the durability and strength of concrete with the addition of fibers in bacterial concrete.

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Section: Introductionmentioning

confidence: 99%

Self-repairing of concrete cracks by using bacteria and basalt fiber

Vijay

Murmu

2019

SN Appl. Sci.

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“…In contrast, autonomic healing is caused by components that are normally not present in cement. In recent studies, progress has been achieved to implement self-healing property in the cement starting material, e.g., by addition of encapsulated liquid SiO 2 precursors, sodium silicate, and MgO powder as healing materials [4,5]. Finally, increasing the crystal-growth seeds was found to contribute to self-healing potency [6].…”

Section: Introductionmentioning

confidence: 99%

Transformation of Construction Cement to a Self-Healing Hybrid Binder

Müller

Tolba

Wang

et al. 2019

IJMS

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A new biomimetic strategy to im prove the self-healing properties of Portland cement is presented that is based on the application of the biogenic inorganic polymer polyphosphate (polyP), which is used as a cement admixture. The data show that synthetic linear polyp, with an average chain length of 40, as well as natural long-chain polyP isolated from soil bacteria, has the ability to support self-healing of this construction material. Furthermore, polyP, used as a water-soluble Na-salt, is subject to Na+/Ca2+ exchange by the Ca2+ from the cement, resulting in the formation of a water-rich coacervate when added to the cement surface, especially to the surface of bacteria-containing cement/concrete samples. The addition of polyP in low concentrations (<1% on weight basis for the solids) not only accelerated the hardening of cement/concrete but also the healing of microcracks present in the material. The results suggest that long-chain polyP is a promising additive that increases the self-healing capacity of cement by mimicking a bacteria-mediated natural mechanism.

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“…Calcium carbonate [11] or hydration products such as C-S-H [12] are formed in order to cause crack healing. In addition, directly introduced expansive measures such as magnesium oxide and bentonite [13], can achieve high sealing efficiency of cracks with an initial width of about 0.18 mm. The second type of healing treatment-i.e., autonomous-is based on the use of bacteria, organic compounds and encapsulated materials with pozzolan.…”

Section: Concretementioning

confidence: 99%

Bacterial Concrete as a Sustainable Building Material?

Stanaszek-Tomal

2020

Sustainability

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The right selection of building materials plays an important role when designing a building to fall within the definition of sustainable development. One of the most commonly used construction materials is concrete. Its production causes a high energy burden on the environment. Concrete is susceptible to external factors. As a result, cracks occur in the material. Achieving its durability along with the assumptions of sustainable construction means there is a need to use an environmentally friendly and effective technique of alternative crack removal in the damaged material. Bacterial self-healing concrete reduces costs in terms of detection of damage and maintenance of concrete structures, thus ensuring a safe lifetime of the structure. Bacterial concrete can improve its durability. However, it is not currently used on an industrial scale. The high cost of the substrates used means that they are not used on an industrial scale. Many research units try to reduce production costs through various methods; however, bacterial concrete can be an effective response to sustainability.

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Autogenous self-healing of cement with expansive minerals-I: Impact in early age crack healing

Cited by 96 publications

References 50 publications

Self-repairing of concrete cracks by using bacteria and basalt fiber

Self-repairing of concrete cracks by using bacteria and basalt fiber

Transformation of Construction Cement to a Self-Healing Hybrid Binder

Bacterial Concrete as a Sustainable Building Material?

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