191. Poročilo o preskusu št.: LVG 2023-061 : vzorec št. 2023/00057Barbara Piškur, Maarten De Groot, Ana Brglez, Špela Hočevar, Špela Jagodic, Tine Hauptman, Nikica Ogris, 2023, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, glive
Published in DiRROS: 17.07.2023; Views: 285; Downloads: 86
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197. Influence of microwaves in the early stage of alkali activation on the mechanical strength of alkali-activated materialsBarbara Horvat, Majda Pavlin, Vilma Ducman, 2023, original scientific article Abstract: This study focuses on the influence of microwave irradiation dosimetry on alkali-activated slurry in its early stages. The impact on the chemistry and mineralogy along with the mechanical properties were evaluated by changing the power of microwaves and their duration of exposure. This influenced the dissolution of amorphous content, diffusion, and self-assembly into an aluminosilicate network. The precursors used in this study were metakaolin, a non-waste material commonly used in geopolymerisation technology, and local fly ash and ladle furnace slag as secondary materials. Furthermore, they were chemically and mineralogically analysed, and their mixtures with NaOH and Na-water glass provided the optimal ratio of the amount of elements obtained using the pre-calculation approach. However, the potential extra addition of water was experimentally determined to allow complete wetting of the material and solid workability during moulding. Using Fourier-transform infrared spectroscopy, the influence of water was further investigated in alkali-activated slag and fly ash irradiated with microwaves, which resulted in the highest values of mechanical strength in the dosimetry-mapping part of the analysis. In addition to the time dependence of the expected mechanical strength on the ageing of the alkali- activated material, the synthesised material exhibited a significant dependence on the dose of microwave irra- diation, which was different for every precursor as well as every mixture with different chemistries.
Keywords: odpadni material, alkalijska aktivacija, obsevanje z mikrovalovi, mehanska trdnost, waste material, alkali activation, microwave irradiation, mechanical strength
Published in DiRROS: 12.07.2023; Views: 394; Downloads: 288
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198. Using recycled material from the paper industry as a backfill material for retaining walls near railway linesKarmen 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: 261; Downloads: 165
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199. Valorized deinking paper residue as fill material for geotechnical structuresKarmen Fifer Bizjak, Barbara Likar, Ana Mladenovič, Vesna Zalar Serjun, 2021, original scientific article Abstract: This study introduces a novel geotechnical composite material comprising two types of fill material sourced from the paper industry-deinking paper sludge ash (DPSA) and deinking paper sludge (DPS). Five composites with different DPSA and DPS contents were investigated. Two composites were selected for further analyses. The technology and procedure for composite installation were implemented in field tests. The composites with 80% and 70% DPSA exhibited the elasticity required to withstand minor landslide slip deformations, in addition to achieving sufficiently high values of uniaxial compressive strength. The composites had a low maximum dry density value, which led to fewer settlements in the entire support structure. The enhanced shear characteristics can enable the construction of a thinner retaining wall. The delay between preparation and installation of the composites was further investigated. The field tests confirmed that the composites with 80% and 70% DPSA can be installed on the construction site 4 h and even 24 h after mixing. In 2018, a retaining wall structure with 70% DPSA and 30% DPS was successfully implemented near a railway line using conventional technology as followed-up research to the herein presented study. Results have been derived from work performed in the scope of the H2020 Paperchain project in which novel circular economy models centered on the valorization of the waste streams generated by the pulp and paper industry as secondary raw material for several resource-intensive sectors, including the construction sector, have been developed. Environmental benefits are savings in natural raw materials, reduction of landfill disposal as well as CO2 emission reduction.
Keywords: deinking paper sludge ash, deinking paper sludge, secondary resources, fill material, geotechnical structure, landslide, open access
Published in DiRROS: 04.07.2023; Views: 267; Downloads: 213
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200. Poročilo o preskusu št.: LVG 2023-040 : vzorec št. 2023/00151Maarten De Groot, Zina Devetak, Špela Jagodic, Barbara Piškur, 2023, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, Fusarium circinatum, borov smolasti rak, Pinus, bor
Published in DiRROS: 21.06.2023; Views: 280; Downloads: 0 |
