Innovative cement-based materials for environmental protection and restoration

Saleh, Hosam M.; Eskander, S.B.

doi:10.1016/b978-0-12-818961-0.00018-1

Cited by 27 publications

(12 citation statements)

References 25 publications

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“…The 42.5 N refers to the grade (strength) of the cement and the speed of strength gain, thus 42.5 MPa with normal (N) strength gain. The addition of 20% of fly ash to cement results in reduced water consumption 35 and the use of slag aids in the reduction of carbon dioxide emissions 36 . However, Krol et al 37 add that cement with significant amounts of fly ash and slags generate low hydration heat but obtain higher strength after longer curing periods than traditional ordinary cement.…”

Section: Methodsmentioning

confidence: 99%

An experimental and numerical study of the strength development of layered cemented tailings backfill

Chiloane,

Sengani,

Mulenga

2024

Sci Rep

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The behaviour of a stratified backfilled stope in terms of strength development and stress distribution has not been well established in the field of rock engineering. Yet, the mining industries with massive ore bodies are looking into high production with a high standard of safety which is mainly governed by large excavation with backfill as a support system. It is difficult to fill these large excavations at one time. Therefore, a subsequent backfilling of the stope layer by layering is adopted, which results in a layered backfill structure. The purpose of this study was to explore the strength development, stress distribution and deformation across the stope supported by both layered and non-layered backfill. It has been observed that the backfill support system gain its strength with time, however, the layered backfill support system loses its strength when more layers are introduced, this is due to the shearing effect around the interfaces of the backfill layers. The impact of layering was validated by 3D numerical simulation. It is therefore concluded that non layered backfill support system are more suitable for stoping mining methods rather than layered support system.

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Section: Methodsmentioning

confidence: 99%

An experimental and numerical study of the strength development of layered cemented tailings backfill

Chiloane,

Sengani,

Mulenga

2024

Sci Rep

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“…Conventional cement-based materials are heavily used in the construction sector and in environmental protection and restoration. In particular, the application of these materials in environmental protection encompass many fields, including rock repair and enforcement, the design of disposal facilities for hazardous and radioactive wastes, the stabilization and solidification of hazardous and radioactive contaminants, and water and wastewater treatment [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. This wide range of applications is supported by the low cost of these materials and their availability, the accumulated knowledge and experience from operating these materials, and the ease of engineering the hardened materials that ensures the attainment of the required performances.…”

Section: Introductionmentioning

confidence: 99%

Permeable Concrete Barriers to Control Water Pollution: A Review

Abdel Rahman,

El-Kamash,

Hung

2023

Water

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Permeable concrete is a class of materials that has long been tested and implemented to control water pollution. Its application in low-impact development practices has proved its efficiency in mitigating some of the impacts of urbanization on the environment, including urban heat islands, attenuation of flashfloods, and reduction of transportation-related noise. Additionally, several research efforts have been directed at the dissemination of these materials for controlling pollution via their use as permeable reactive barriers, as well as their use in the treatment of waste water and water purification. This work is focused on the potential use of these materials as permeable reactive barriers to remediate ground water and treat acid mine drainage. In this respect, advances in material selection and their proportions in the mix design of conventional and innovative permeable concrete are presented. An overview of the available characterization techniques to evaluate the rheology of the paste, hydraulic, mechanical, durability, and pollutant removal performances of the hardened material are presented and their features are summarized. An overview of permeable reactive barrier technology is provided, recent research on the application of permeable concrete technology is analyzed, and gaps and recommendations for future research directions in this field are identified. The optimization of the mix design of permeable reactive concrete barriers is recommended to be directed in a way that balances the performance measures and the durability of the barrier over its service life. As these materials are proposed to control water pollution, there is a need to ensure that this practice has minimal environmental impacts on the affected environment. This can be achieved by considering the analysis of the alkaline plume attenuation in the downstream environment.

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“…These materials are able to absorb multiple times of their weight, but they are mechanically vulnerable; and due to their consistency and leaching properties, it is necessary to provide secondary packaging. Embedding this type of waste in a cementitious or geopolymer matrix may be a safer and less costly treatment option for long-term storage [7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Preliminarily Experiments of Liquid Scintillation Cocktail Waste Solidification

Baranyi

Kopecskó

2022

Period. Polytech. Civil Eng.

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Liquid scintillation spectroscopy (LSC) is a widely used laboratory method for measuring radioactive especially low-energy alpha and beta emitter isotopes in solutions. Since the scintillation cocktails (SCs) contain large amounts of aromatic hydrocarbon compounds after the LSC measurement, the sample usually becomes organic radioactive waste, which is challenging to manage and dispose of. The most common and effective waste treatment method is incineration, a costly and cumbersome solution. Another simpler and less expensive way is the immobilization the organic liquids by embedding in cement or geopolymer matrix.The aim of our experiments is to find a universal mix design to solidify and immobilize scintillation cocktail wastes (SCWs) of unknown composition. During the measurement, we assumed that the SCWs could contain Ultima Gold, Ultima Gold LLT, InstaGel Plus and ProSafe FC type scintillation cocktails in pure form or mixed with unknown quantities of water. Therefore, we performed experiments with inactive pure SCs as surrogates to mimic the SCWs. Since the water content determination of the organic solutions is difficult, the mix design must be independent of the water content of SCWs.During our experiments, we found an appropriate mix design to solidify all available SCs up to 5% using CEM I 42.5 N type cement, Metaver N type metakaolin and sodium hydroxide. We could solidify our tested SCW with this mix, and this product meets the waste acceptance criteria of all Hungarian radioactive waste repositories.

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Innovative cement-based materials for environmental protection and restoration

Cited by 27 publications

References 25 publications

An experimental and numerical study of the strength development of layered cemented tailings backfill

An experimental and numerical study of the strength development of layered cemented tailings backfill

Permeable Concrete Barriers to Control Water Pollution: A Review

Preliminarily Experiments of Liquid Scintillation Cocktail Waste Solidification

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