Chloride binding capacity of green concrete mixed with fly ash or coal gangue in the marine environment

Wang, Yuanzhan; Liu, Chenxi; Tan, Yi; Wang, Yuchi; Li, Qingmei

doi:10.1016/j.conbuildmat.2020.118006

Cited by 37 publications

(6 citation statements)

References 49 publications

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“…Figure 19b shows the effect of different fly ash content on concrete shrinkage. It can be seen that the shrinkage of concrete can be reduced effectively with the increase of fly ash, but the mechanical properties of concrete will be affected if the content exceeds 25% [89,99]. After fly ash is added to coal gangue concrete, the chloride ion migration coefficient is negatively correlated with the content of fly ash.…”

Section: Fly Ashmentioning

confidence: 99%

“…After fly ash is added to coal gangue concrete, the chloride ion migration coefficient is negatively correlated with the content of fly ash. Filling makes coal gangue concrete denser, and secondary hydration increases the content of hydration products, and the addition of fly ash can effectively decrease the chloride ion permeability resistance of coal gangue concrete [89,99].…”

Section: Fly Ashmentioning

confidence: 99%

See 1 more Smart Citation

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

et al. 2022

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Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue aggregate on concrete properties and the prediction model of gangue concrete, and summarizes the influence of modified materials on gangue concrete. The studies analyzed in this review show that different treatments influence the performance of coal gangue aggregate concrete. With the increase in the replacement ratio of coal gangue aggregate in concrete, the concrete workability and mechanical performance are reduced. Furthermore, the pore structure changes lead to decreased porosity, greatly affecting the durability. Coal gangue is not recommended for producing high-grade concretes. Nevertheless, pore structure can be improved by adding mineral admixtures, fibers, and admixtures to the coal gangue concrete. Hence, the working properties, mechanical properties, and durability of the concrete can be improved effectively, ensuring that coal gangue concrete meets engineering design requirements. Adding modified materials to coal gangue concrete is a viable future development direction.

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Section: Fly Ashmentioning

confidence: 99%

Section: Fly Ashmentioning

confidence: 99%

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

et al. 2022

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“…A higher Al2O3 or Fe2O3 content of the fly ash will show a higher binding capacity. FA has a positive effect on the time-invariant chloride binding capacity of concrete and the binding capacity increases with the increase of FA replacement ratio [59]. Determination of chloride penetration depth can mainly be applied to concrete compositions that are exposed to thawing salts, seawater, brackish water and chloridecontaining solutions.…”

Section: Concrete Chloride Resistancementioning

confidence: 99%

Effect of ultra-fine fly ash on concrete performance and durability

Maeijer

Craeye

Snellings

et al. 2020

Construction and Building Materials

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“…The improper disposal of fly ash presents a variety of environmental problems, thus considerable research has been undertaken on the subject worldwide for years. The major utilization of fly ash has been in construction, such as mine back filling, light weight aggregates, road sub-bases [15], and green concrete [16]. The American Society of Testing Materials divided fly ash into Class C and Class F ash based on the oxide content [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cementitious Materials from Mechanochemically Modified Copper Smelting Slag Compounded with High-Aluminum Fly Ash

Sheng,

Lan,

et al. 2024

Materials

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Copper smelting slag discharged from mining and high-aluminum fly ash generated during the combustion of coal for energy production are two typical bulk solid wastes, which are necessary to carry out harmless and resourceful treatment. This research proposed an eco-friendly and economical method for the co-consumption of copper smelting slag and high-aluminum fly ash. Cementitious materials were compounded with copper smelting slag and high-aluminum fly ash as the main materials were successfully prepared, with a 28-d compressive strength up to 31.22 MPa, and the heavy metal leaching toxicity was below the limits of the relevant standards. The optimum mechanical properties of the cementitious materials were obtained by altering the material proportion, ball mill rotation speed, and CaO dosage. Under the combined effect of mechanical ball milling at a suitable speed and chemical activation with a certain alkali concentration, the prepared cementitious materials had an initial activation. The pastes of the cementitious materials generated a gel system during the subsequent hydration process. The two steps together improved the mechanical strength of the cured products. The preparation was simple to operate and offered a high stability of heavy metals. The heavy metal contaminants were kept at a low content throughout the process from raw materials to the prepared cured specimens, which was suitable for application in practical environmental remediation projects and could provide effective solutions for ecological environment construction.

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Chloride binding capacity of green concrete mixed with fly ash or coal gangue in the marine environment

Cited by 37 publications

References 49 publications

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

Using Chinese Coal Gangue as an Ecological Aggregate and Its Modification: A Review

Effect of ultra-fine fly ash on concrete performance and durability

Preparation of Cementitious Materials from Mechanochemically Modified Copper Smelting Slag Compounded with High-Aluminum Fly Ash

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