Enhancement in strength parameters of concrete by application of Bacillus bacteria

Nain, Nidhi; Surabhi, R.; Yathish, N.V.; Krishnamurthy, V.; Deepa, T.; Tharannum, Seema

doi:10.1016/j.conbuildmat.2019.01.059

Cited by 120 publications

(32 citation statements)

References 23 publications

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“…(1) The less porosity by 70% due to the growth of new dense calcite crystals [62,75]. (2) The less water absorption capacity (WAC) by 50-80% for low-to high-grade concretes [62].…”

Section: Discussionmentioning

confidence: 99%

“…iii) Finding optical density (OD) value (nm) using a spectrophotometer that measures the cell suspension absorbance (the amount of light scattered where visible light passes through the cells) [69,75]. There is different experimental cell concentration of B. subtilis JC3 microorganisms (10 3 cells/ml, 10 4 cells/ml, 10 5 cells/ml, 10 6 cells/ml, 10 7 cells/ml, and 10 9 cells/ml) added to the mixing water.…”

Section: Review B Subtilis Srmentioning

confidence: 99%

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Self-repairing polyethylene fiber-reinforced-concrete with bacillus subtilis bacteria a review

Ghoneim

Hassan

Aboul-Nour

2020

IJET

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Fibers and bacterial additives in concrete have achieved significant success as a construction material. This paper presents the field of concrete self-repairing by introducing both Bacillus subtilis bacteria and polyethylene fiber as a dual-components. The main research goal is to reveal the principles of concrete self-repairing. At first, the research investigates the fiber-reinforced-concrete behavior, the concrete self-repairing process with the Bacillus subtilis bacteria for forming bacterial-concrete. And then, the study highlights the damage-repairing numerical simulation of fiber-reinforced-bacterial-concrete. The research shows the bacterial-concrete benefits to durability and mechanical properties besides to the polyethylene fiber assistance to enhance post-cracking tensile resistance and the pre-peak elastic modulus of concrete. The novelty of the fiber-reinforced-bacterial-concrete is the matrix combined improvement of both basic material properties and the post-cracking deflection capacity.

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“…(1) The less porosity by 70% due to the growth of new dense calcite crystals [62,75]. (2) The less water absorption capacity (WAC) by 50-80% for low-to high-grade concretes [62].…”

Section: Discussionmentioning

confidence: 99%

Section: Review B Subtilis Srmentioning

confidence: 99%

Self-repairing polyethylene fiber-reinforced-concrete with bacillus subtilis bacteria a review

Ghoneim

Hassan

Aboul-Nour

2020

IJET

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“…This is much higher than the 13% strength increment after MICP treatment of concrete with 30 MPa compressive strength. In a comparative experimental study of Nain et al [ 37 ], concrete samples treated with B . megaterium showed a slightly higher compressive strength than those treated with B .…”

Section: Effects Of Bacterial Treatment On Compressive Strength Of Cement Compositesmentioning

confidence: 99%

Bio-Cementation in Construction Materials: A Review

2021

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The rapid development of the construction sector has led to massive use of raw construction materials, which are at risk of exhaustion. The problem is aggravated by the high demand for cement as binding powder and the mass production of clay bricks for construction purposes. This scenario has led to high energy consumption and carbon emissions in their production. In this regard, bio-cementation is considered a green solution to building construction, because this technology is environmentally friendly and capable of reducing carbon emissions, thus slowing the global warming rate. Most of the previously published articles have focused on microbiologically induced calcium carbonate precipitation (MICP), with the mechanism of bio-cementation related to the occurrence of urea hydrolysis as a result of the urease enzymatic activity by the microbes that yielded ammonium and carbonate ions. These ions would then react with calcium ions under favorable conditions to precipitate calcium carbonate. MICP was investigated for crack repair and the surface treatment of various types of construction materials. Research on MICP for the production of binders in construction materials has become a recent trend in construction engineering. With the development of cutting edge MICP research, it is beneficial for this article to review the recent trend of MICP in construction engineering, so that a comprehensive understanding on microbial utilization for bio-cementation can be achieved.

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“…Ureolytic bacteria have the ability to produce a urease enzyme, which hydrolyses urea into ammonia and CO 2 , inducing a rapid increase of pH and the precipitation of CaCO 3 . The alkali-tolerant ureolytic strains most commonly investigated for their application in cement-based materials are Sporosarcina pasteurii, Sporosarcina ureae, Bacillus sphaericus and Bacillus megaterium (10,27,(84)(85)(86).…”

Section: -mentioning

confidence: 99%

Self-healing concrete-What Is it Good For?

2021

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Self-healing of concrete is the process in which the material regenerates itself repairing inner cracks. This process can be produced by autogenous or autonomous healing. Autogenous healing is a natural process, produced by carbonation and/or continuing hydration. Autonomous healing is based on the use of specific agents to produce self-healing, which can be added directly to the concrete matrix, embedded in capsules or introduced through vascular networks. Some examples are superabsorbent polymers, crystalline admixtures, microencapsulated sodium silicate, and bacteria. This review is structured into two parts. The first part is an overview of self-healing concrete that summarises the basic concepts and the main advances produced in the last years. The second part is a critical discussion on the feasibility of self-healing concrete, its possibilities, current weaknesses, and challenges that need to be addressed in the coming years.

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Enhancement in strength parameters of concrete by application of Bacillus bacteria

Cited by 120 publications

References 23 publications

Self-repairing polyethylene fiber-reinforced-concrete with bacillus subtilis bacteria a review

Self-repairing polyethylene fiber-reinforced-concrete with bacillus subtilis bacteria a review

Bio-Cementation in Construction Materials: A Review

Self-healing concrete-What Is it Good For?

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