Carbonation Behavior of GGBFS Concrete Considering Loading Conditions and Cold Joint

Hwang, Sang-Hyeon; Yoon, Yong-Sik; Kwon, Seung-Jun

doi:10.4334/jkci.2019.31.4.365

Cited by 3 publications

(2 citation statements)

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“…Carbonation refers to a phenomenon where cement hydrates in concrete absorb carbon dioxide and are transformed into calcium carbonate (CaCO 3 ), resulting in the loss of alkali properties. In general, carbonation occurs when calcium hydroxide in the pores of the concrete reacts with carbon dioxide (CO 2 ) in the air [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ]; however, this reaction rarely occurs on dry concrete surfaces because it requires humidity [ 20 ]. However, a high humidity environment is created inside the water treatment facility which forms carbonation conditions, thereby posing a high risk of rebar corrosion in concrete.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Carbonation Rate on the Concrete Water Reservoir Structures According to Applied Waterproofing/Anticorrosive Methods

Park²,

Choi

et al. 2022

Materials

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This study seeks to analyze how the degree of carbonation and the application of waterproofing and anticorrosive materials affect carbonation in water reservoirs among the water treatment facilities managed by the Seoul Metropolitan Government. To guarantee similarity of the experimental group, 42 highly similar water reservoirs were selected from among the water supply reservoirs currently in operation in Seoul. On-site carbonation assessments were performed in order to derive the carbonation rate coefficients. In the water reservoirs with applied waterproofing and anticorrosive materials immediately after public service, the upper and lower limits were D = 1.13 and D = 0.29, respectively, whereas those of the water reservoir applied with waterproofing and anticorrosive materials after 15 years of service life were D = 1.89 and D = 0.94, respectively. The comparative analysis showed that the rate of reduction in the carbonation rate was about 10.4% to 16.8% in the water reservoirs applied with waterproofing and anticorrosive methods after 15 years of service life. However, reduction in the carbonation rate was about 46.4% to 74.3% in the water reservoirs applied with waterproofing and anticorrosive methods at the initial stage of service life. It was confirmed that the early application of waterproofing and anticorrosive materials is effective in suppressing carbonation of concrete water reservoir structures.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Carbonation Rate on the Concrete Water Reservoir Structures According to Applied Waterproofing/Anticorrosive Methods

Park²,

Choi

et al. 2022

Materials

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show abstract

“…Furthermore, as this process progresses for long periods of time, such cracks that occur on the surface of the structure pose a great threat to structural safety. Particularly, underground structures, such as a subway structure, are exposed to a CO 2 concentration of more than 660 ppm and high humidity at 60-70%, which promotes carbonation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of CNT Incorporation on the Carbonation of Conductive Cement Mortar

et al. 2021

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This study analyzed the influence of carbon nanotubes (CNTs) on the carbonation conductive cementitious composites. Two powder types of CNT, multi-walled and single-wall CNTs, were employed to give the cement mortar the conductivity, and four tests including the accelerated carbonation, compressive and flexural strength, electrical resistance, and porosity tests were carried out. To intentionally accelerate the carbonation, the prismatic specimens of conductive cement composites were fabricated and stored in the controlled environmental chamber at a constant temperature of 20 ± 2 °C, constant relative humidity of 60 ± 5%, and carbon dioxide (CO2) concentration of 5% for 12 weeks. It was observed that carbonation resulted in only chemical damage so that there was no change in the electrical resistance value of conductive cementitious mortar that had undergone a carbonation attack.

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Service life of GGBFS concrete under carbonation through probabilistic method considering cold joint and tensile stress

Yoon

Yang

Kwon

2020

Journal of Building Engineering

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Carbonation Behavior of GGBFS Concrete Considering Loading Conditions and Cold Joint

Cited by 3 publications

References 0 publications

Analysis of the Effect of Carbonation Rate on the Concrete Water Reservoir Structures According to Applied Waterproofing/Anticorrosive Methods

Analysis of the Effect of Carbonation Rate on the Concrete Water Reservoir Structures According to Applied Waterproofing/Anticorrosive Methods

Influence of CNT Incorporation on the Carbonation of Conductive Cement Mortar

Service life of GGBFS concrete under carbonation through probabilistic method considering cold joint and tensile stress

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