Protection of concrete structures under sulfate environments by using calcifying bacteria

Joshi, Sumit; Goyal, Shweta; Mukherjee, Abhijit; Reddy, M. Sudhakara

doi:10.1016/j.conbuildmat.2019.03.079

Cited by 51 publications

(24 citation statements)

References 35 publications

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“…Figures 2, 3 and 4 show the appearance of control specimens, BAT and BST respectively when exposed to sulfate solutions. These results are according to Sumit et al, findings [67].…”

Section: Visual Appearance/ Observationssupporting

confidence: 90%

“…Najjar et al, [69] in their work reported that ingress of sulfate ions into the concrete matrix triggers the formation of expansive products that fills the pores and voids leading to the densification of microstructure during the initial exposure of concrete to sulfate rich areas. Summit et al, [67] observed severe strength loss in control test cement after 12 months of exposure to sulphate solutions. The compressive strength of the control test cement (blank) decreased by 30% as compared to the initial strength before exposure while the bacteria treated test cement showed no significant drop in strength.…”

Section: Chemical Sulphate Attack 311 Compressive Strengthmentioning

confidence: 98%

“…The studies conducted by [67] clearly showed distinct difference in control specimens versus bacterial treated specimens when subjected into sulfate solutions. According to the authors there was clear sign of degradation of the control specimen after 12 months of exposure to sulfate solution.…”

Section: Visual Appearance/ Observationsmentioning

confidence: 99%

“…According to Joshi et al findings [67], the performance of cement both mortar prisms and concrete cubes were subjected to sulphate environment using the outlined exposure regimes (as shown in Table 2). Concentrations of the nutrient broth medium, urea and calcium were 1.3%w/v, 2% w/v and 25mM w/v, respectively.…”

Section: Chemical Sulphate Attack 311 Compressive Strengthmentioning

confidence: 99%

“…While concrete is the most preferred building material, it is susceptible to the aggressive materials such as sulfates, carbon dioxide, and chlorides. The ingress of these agents into the concrete matrix causes serious durability threat on the concrete structures [1,2]. Most of the concrete structures are suffering from durability threats due to the presence of micro and macro cracks that may develop during the service life of the concrete structures.…”

Section: Introductionmentioning

confidence: 99%

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Use of Bacillus Species Bacteria in Protecting the Concrete Structures from Sulphate Attack- A Review

et al. 2019

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Deleterious ions in the environment such as sulfates may degrade the concrete structures. The interaction of cement hydration products with these destructive agents contributes to severe durability threat of the concrete structures. External sulfate attack is well-known for causing permanent changes in concrete. Microbially induced calcium carbonate (MICP) precipitation has been considered as a unique technique in enhancing the durability properties of concrete. This review paper discusses the possibility of bio-deposition from MICP process as a barrier in microbial treated concrete against the penetration of sulfate ions in a sulfate-rich environment. The effect associated with chemical and physical sulfate attack is discussed in line with the mechanical properties of cement such as compressive strength whereas microscopic evaluation is based on scanning electron microscopy studies. The shortcomings associated with sulfate ions in cement-based materials and the positive effects of incorporating bacillus species bacteria in sulfate rich areas is discussed. This review found that, MICP can significantly reduce the ingress of sulfate ions in cement-based materials, which results in improving the mechanical properties of the cement mortar/concrete.

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“…Figures 2, 3 and 4 show the appearance of control specimens, BAT and BST respectively when exposed to sulfate solutions. These results are according to Sumit et al, findings [67].…”

Section: Visual Appearance/ Observationssupporting

confidence: 90%

Section: Chemical Sulphate Attack 311 Compressive Strengthmentioning

confidence: 98%

Section: Visual Appearance/ Observationsmentioning

confidence: 99%

Section: Chemical Sulphate Attack 311 Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of Bacillus Species Bacteria in Protecting the Concrete Structures from Sulphate Attack- A Review

et al. 2019

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Preparation of novel and durable concrete skin

Shi

2020

Structural Concrete

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The performance of the conventional concrete skin was promoted by ultrasonic surface treatment (UST) in this study, and the newly formed dense and hard concrete skin was termed as ultrasonic hardening layer (UHL). The microstructure of UHL was scanned and analyzed, several durability‐related indicators, such as water vapor penetration rate, surface, and interface hardness, were measured, and it was found that UHL could effectively improve the durability of concretes. The light reflectance of the UHL concrete surface was measured in the spectrum range of UV (200 nm) to NIR (2,500 nm), and it manifested 24.17% less mean reflectance than the conventional concrete skin. Therefore, UHL could serve as a promising road material due to its better melting capacity in cold‐temperate zones.

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Review on Bacteria Based Cementitious Matrix for Sustainable Building Construction

Maurya

Rawat

Shanker

2022

Lecture Notes in Civil Engineering

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Protection of concrete structures under sulfate environments by using calcifying bacteria

Cited by 51 publications

References 35 publications

Use of Bacillus Species Bacteria in Protecting the Concrete Structures from Sulphate Attack- A Review

Use of Bacillus Species Bacteria in Protecting the Concrete Structures from Sulphate Attack- A Review

Preparation of novel and durable concrete skin

Review on Bacteria Based Cementitious Matrix for Sustainable Building Construction

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