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Query: "keywords" (backfill material) .

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1.
Validation of the recycled backfill material for the landslide stabilization at a railway line
Karmen Fifer Bizjak, Barbara Likar, 2024, original scientific article

Abstract: In mountain areas landslides many times endanger safety of transport infrastructures, and these must be stabilized with retaining wall structures. In this paper the validation of a new composite as a backfill material for landslide stabilization with a large scale demo retaining wall is presented. The new composite was made from residues of paper industry, which uses for its production deinking process. New composite was validated with the laboratory tests, construction of small demo sites and at the end with a large demo retaining wall structure with a length of 50 m. It was concluded that the paper sludge ash and the paper sludge are in proportion 70:30, compacted on the optimal water content and maximum dry density, reached sufficient uniaxial compressive and shear strength. However, the composite's hydration processes required the definition of an optimal time between the composite mixing and installation. In 2019, the retaining wall structure from the new composite was successfully built. The large demo structure is an example of the knowledge transfer from the laboratory to the construction site, in which composite and installing technology could be verified.
Keywords: landslides, recycled backfill material, paper sludge ash, geotechnical composite, railway line, recycled material, environment
Published in DiRROS: 26.03.2024; Views: 118; Downloads: 87
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2.
Using recycled material from the paper industry as a backfill material for retaining walls near railway lines
Karmen Fifer Bizjak, Barbara Likar, Stanislav Lenart, 2021, original scientific article

Abstract: The construction industry uses a large amount of natural virgin material for different geotechnical structures. In Europe alone, 11 million tonnes of solid waste is generated per year as a result of the production of almost 100 million tonnes of paper. The objective of this research is to develop a new geotechnical composite from residues of the deinking paper industry and to present its practical application, e.g., as a backfill material behind a retaining structure. After different mixtures were tested in a laboratory, the technology was validated by building a pilot retaining wall structure in a landslide region near a railway line. It was confirmed that a composite with 30% deinking sludge and 70% deinking sludge ash had a high enough strength but experienced some deformations before failure. Special attention was paid to the impact of transport, which, due to the time lag between the mixing and installation of the composite, significantly reduced its strength. The pilot retaining wall structure promotes the use of recycled materials with a sustainable design, while adhering to government-mandated measures.
Keywords: paper sludge ash, deinking sludge, paper industry, backfill material, retaining wall
Published in DiRROS: 04.07.2023; Views: 253; Downloads: 158
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