71. Determination of the maximum CO2 sequestration capacity of Slovenian waste ashes using thermogravimetry and calcimetrySara Tominc, Vilma Ducman, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: There are several ways to utilize as-received or pre-treated waste ash, one of the most promising is by accelerated mineral carbonation. Ashes with a high content of Ca and Mg compounds, such as ashes from wood biomass, are ideal candidates for sequestration. Due to the shift toward renewable fuels, ash from biomass as a by-product of solid fuel combustion is therefore available in huge quantities. As part of the EU AshCycle project, we have analyzed ashes from different incineration and thermal power plants to determine their carbon sequestration potential. These include various waste ashes from Slovenia, which were subjected to accelerated carbonation in a closed carbonation chamber with a CO2 concentration of 4% (v/v), 80% relative humidity and a temperature of 40 °C until maximum CO2 uptake was reached. CO2 quantification was performed using calcimetry (pressure calcimeter) and thermogravimetry. We have shown that ash from wood biomass and the co-combustion of wood waste and paper sludge have a high CO2 sequestration potential in comparison to others. The direct use of wood biomass ash for CO2 sequestration in carbonated building products could significantly benefit the circular economy, especially since 70% of wood biomass ash is still landfilled.
Ključne besede: CO2 sequestration capacity, accelerated carbonation, waste ashes, thermogravimetric analysis, calcimetry
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72. Večjezičnost in narodna zavest kot kvaliteti cerkvenega izobraženca v Istri pred Prvo svetovno vojnoDiana Košir, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: V prispevku je predstavljena paradigma večjezičnosti v Istri, ki je bila pred 1. svetovno vojno dežela Avstrijskega primorja. S sociolingvističnega vidika je opisan status jezikov v okolju, zlasti slovanskih, v odnosu do nemščine in dominantne italijanščine, ter analizirana jezikovna raba slovenskih izobražencev na primeru redovnika Hijacinta Repiča in duhovnika, prosvetnega delavca in politika Franje Ravnika. Njuno delovanje je predstavljeno s kulturno zgodovinsko metodo, izhajajoč iz modela etnične identitete, katerega pomembni del je narodna in jezikovna zavest posameznika. Ugotovljeno je bilo, da je bila tedaj izobražena duhovščina slovanskih korenin večjezična, za razliko od italijanskega klera, in da se je preklapljanje med jeziki dogajalo po načelu pragmatičnosti in aktualnosti. Na primeru dveh zgodovinskih osebnosti sta orisana dva »obraza večjezičnosti« – narodna zavest kot aktivna drža posameznika se je lahko odražala različno: pri patru Repiču skozi pisano besedo in izza samostanskih zidov, z jezikovno izobrazbo bodočih duhovnih pastirjev, pri Ravniku pa z angažirano družbeno-politično akcijo.
Ključne besede: Istra, frančiškani, duhovščina, Hijacint Repič (1863–1918), Franjo Ravnik (1832–1883), zgodovinska sociolingvistika, večjezičnost, jezikovna zavest, narodna zavest
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73. Late-microwave irradiation of alkali-activated waste glass wool : linking dehydration rate with thermomechanical behaviourBarbara Horvat, Anže Tesovnik, Branka Mušič, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: Building and civil engineering conventional inorganic binding materials represent a significant burden for the environment, leading to the search for more sustainable materials. One of the potential solutions is alkali-activated materials (AAMs), which can be made solely from waste materials and at lower temperatures. However, reaction rate and solidification time depend on the precursor used. To enhance the speed of solidification, the curing temperature can be increased, but from the inside out not to create the crust on the surface, which would hinder the dehydration. Therefore, three mixtures of alkali-activated glass wool, a slow-in-alkali media solidifying precursor, were irradiated with low- and high-power microwaves in the late curing stage till complete dehydration, to determine the influence of artificial volumetric solidification onto thermomechanical behaviour of the AAM. As the electromagnetic power increased, the damages in the AAM became more severe, resulting in a reduction in mechanical strength.
Ključne besede: microwave irradiation, electromagnetic dehydration, glass wool, alkali-activated materials, mechanical performance
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74. GEORIS pavers – small scale demonstration within GEORIS projectMojca Loncnar, Lubica Kriskova, Christos Georgopoulos, Dimitra Skentzou, Anže Tesovnik, Vilma Ducman, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: Technology of alkali activation is an alternative sustainable approach to producing paving paver, where reactive aluminosilicate precursor undergoes a reaction with an alkaline solution to form binded product. The case study presents the functional usability of a technology as part of the Georis project. The construction pavers are composed of over 75% industrial residues, with the majority of the materials sourced from steel slag industry. Laboratory testing of pavers confirmed the promising mechanical properties, demonstrating high compressive and flexural strength, as well as resistance to frost and abrasion. The results support the feasibility of scaling up from lab-scale to pilot manufacturing. The innovative approach in this project was the pilot production process itself, where more than 20 m² of pavers were manufactured and cured in a mobile unit. To assess their real-world performance, a demonstration case was implemented at the SIJ Acroni courtyard, where the pavers were installed to observe their application in a practical setting and to monitor their long-term durability. The valorisation of residues within GEORIS pavers highlights lower CO₂ emissions compared to conventional cement-based pavers and the potential of technology for industrial symbiosis and circular economy initiatives, making it an attractive solution for environmentally conscious industries.
Ključne besede: waste materials, alkali activated material, sustainable approach, slag, pavers
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76. Mineral waste into alkali-activated pavementsMajda Pavlin, Kaja Zupančič, Alenka Sešek Pavlin, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: The study highlights the pressing need to recycle mineral waste to mitigate resource depletion and environmental damage. It focuses on creating sustainable pavement slabs through alkali activation, using a variety of waste materials such as bio-ash, local slags and mineral wool. Through extensive testing of different mix designs, the optimal mixture was identified: bio-ash, ladle slag, and metakaolin, activated with sodium silicate. This combination demonstrated good mechanical properties and showed low concentrations of toxic elements in leaching tests, confirming environmental safety. The research also prioritized energy efficiency, with the curing process conducted at room temperature and demolding after just one day. A test field at Termit d.d. was established to assess the practical application and potential for commercial use of these innovative paving materials, aiming to support a circular economy by extending the lifecycle of resources.
Ključne besede: alkali-activation, pavement slabs, mineral waste, recycling
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78. Overview of the impacts of additive production techniques on the environment : production of continuous fibers, direct laser sintering of metals and selective laser sintering techniquesBranka Mušič, Barbara Horvat, 2025, objavljeni znanstveni prispevek na konferenci Povzetek: Additive manufacturing (AM) has experienced significant growth in recent years, emerging as a transformative technology with broad applications across various industries. This review explores the advantages, disadvantages, and environmental impacts of AM, an important area of consideration as this technology continues to gain popularity. By analyzing existing literature, we assess the challenges associated with AM processes, particularly in comparison to traditional manufacturing methods. AM has the greatest potential to contribute to sustainable development by the production of lightweight components and complex industrial products with intricate designs. These products are made with minimal material usage. Consequently, also waste and emissions are reduced, which are significant environmental advantages. Overall, this review highlights the importance of AM as a tool for advancing sustainability in manufacturing and offers valuable insights for Continuous Fiber Fabrication, Direct Metal Laser Sintering, and Selective Laser Sintering techniques to enhance their competitive advantage while reducing their environmental impact.
Ključne besede: additive manufacturing, 3D print, continuous fiber fabrication, direct metal laser sintering, selective laser sintering, AddCircles
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79. Structural integrity evaluation of the DTT plasma facing unit using detailed CFD and thermo-mechanical analysesPatrik Tarfila, Oriol Costa Garrido, Boštjan Končar, Emanuela Martelli, Francesco Giorgetti, Selanna Rocella, 2024, izvirni znanstveni članek Povzetek: A new Divertor Tokamak Test (DTT) facility is currently being built in Italy to investigate different divertor configurations under different plasma scenarios. The divertor and in particular its target, consisting of Plasma Facing Units (PFUs), is exposed to high heat loads due to plasma fluence. In this paper, the structural integrity of the PFU is evaluated for a reference Single Null (SN) divertor configuration under three different plasma scenarios. A comprehensive structural integrity analysis has been carried out in three stages. In the first stage, computational fluid dynamic (CFD) analyses of the divertor’s PFU with a cooling channel were performed at three different heat loads corresponding to three plasma scenarios. The temperature fields calculated by the CFD analyses were then used as input for the second stage, in which thermo-mechanical simulations were performed to predict the stresses and displacements in the PFU. Due to the high local heat loads, high stresses or even yielding are expected in the PFU’s structural components. Therefore, in the third stage, the structural integrity of critical cross-sections has been verified using the Structural Design Criteria for In-vessel Components (SDC-IC). It has been demonstrated that structural components of the PFU are able to withstand the expected loads, although some non-structural components experienced yielding while not exceeding the critical values.
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80. Divertor Tokamak Test facility project : status of design and implementationF. Romanelli, Oriol Costa Garrido, Boštjan Končar, Patrik Tarfila, P. Zumbolo, 2024, izvirni znanstveni članek Povzetek: An overview is presented of the progress since 2021 in the construction and scientific programme preparation of the Divertor Tokamak Test (DTT) facility. Licensing for building construction has been granted at the end of 2021. Licensing for Cat. A radiologic source has been also granted in 2022. The construction of the toroidal field magnet system is progressing. The prototype of the 170 GHz gyrotron has been produced and it is now under test on the FALCON facility. The design of the vacuum vessel, the poloidal field coils and the civil infrastructures has been completed. The shape of the first DTT divertor has been agreed with EUROfusion to test different plasma and exhaust scenarios: single null, double null, X-divertor and negative triangularity plasmas. A detailed research plan is being elaborated with the involvement of the EUROfusion laboratories.
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