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105. Evaluation of the performance of clay-based bricks with the addition of co-combustion ashLea Žibret, Ivana Carević, Nina Štirmer, Ivan Koloda, Mojca Vrčon, Miha Kragelj, Vilma Ducman, 2025, published scientific conference contribution Abstract: The gradual replacement of coal by local renewable resources leads to an increased production of co-combustion ashes (CC). Their disposal can be limited by their use in the construction sector, where they can partially replace primary raw materials. This study evaluates the incorporation of selected Slovenian CC ash into clay-based fired bricks within the EU AshCycle project. The tests included the measurement of water absorption, porosity, density, weight loss, shrinkage, flexural and compressive strength, and freeze-thaw resistance. Two types of clay were used to compare the influence of the selected ash on the performance of the fired samples. Replacing clay mixtures with 10 wt% CC ash reduced the compressive strength of the fired bricks but it still reached the required 10 MPa as specified in EN 772-1 (2015). The addition of CC ash to fired bricks requires careful planning of the raw mixes, taking into account various parameters that may affect the properties of the products.
Keywords: fired clay bricks, waste ashes, raw mixture, ceramic-technological tests, freeze-thaw resistance
Published in DiRROS: 07.04.2025; Views: 77; Downloads: 29
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106. Prisotnost prevzetih izrazov iz BHSČ jezika v govoru mest Slovenske IstreMaša Rolih, 2025, published scientific conference contribution Abstract: Prispevek preučuje prisotnost pogovornih izrazov, ki izvirajo iz bosanskega/hrvaškega/srbskega/črnogorskega jezika (BHSČ), v govoru mest Slovenske Istre (Koper, Izola, Piran, Ankaran, Lucija, Portorož), pri čemer je med drugim poudarek na razlikah in vzporednicah med splošnim in pokrajinskim pogovornim jezikom ter mestnim govorom. Spletna anketa, izvedena med prebivalci teh mest, razkriva vpliv teh izrazov na mestni govor in ponazarja, v kolikšni meri so ti izrazi vključeni v vsakdanjo komunikacijo ter kateri pogovorni izrazi, ki izvirajo iz teh jezikov, niso del jezikovnega sistema mestnega govora tega območja.
Keywords: mestni govor, pogovorni jeziki, slovarji, etimologija, BHSČ izrazi, kvalifikatorji, Slovenska Istra, vsakdanja komunikacija
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107. Determination of the maximum CO2 sequestration capacity of Slovenian waste ashes using thermogravimetry and calcimetrySara Tominc, Vilma Ducman, 2025, published scientific conference contribution Abstract: 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.
Keywords: CO2 sequestration capacity, accelerated carbonation, waste ashes, thermogravimetric analysis, calcimetry
Published in DiRROS: 07.04.2025; Views: 76; Downloads: 25
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108. Večjezičnost in narodna zavest kot kvaliteti cerkvenega izobraženca v Istri pred Prvo svetovno vojnoDiana Košir, 2025, published scientific conference contribution Abstract: 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.
Keywords: Istra, frančiškani, duhovščina, Hijacint Repič (1863–1918), Franjo Ravnik (1832–1883), zgodovinska sociolingvistika, večjezičnost, jezikovna zavest, narodna zavest
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109. Late-microwave irradiation of alkali-activated waste glass wool : linking dehydration rate with thermomechanical behaviourBarbara Horvat, Anže Tesovnik, Branka Mušič, 2025, published scientific conference contribution Abstract: 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.
Keywords: microwave irradiation, electromagnetic dehydration, glass wool, alkali-activated materials, mechanical performance
Published in DiRROS: 07.04.2025; Views: 63; Downloads: 21
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110. GEORIS pavers – small scale demonstration within GEORIS projectMojca Loncnar, Lubica Kriskova, Christos Georgopoulos, Dimitra Skentzou, Anže Tesovnik, Vilma Ducman, 2025, published scientific conference contribution Abstract: 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.
Keywords: waste materials, alkali activated material, sustainable approach, slag, pavers
Published in DiRROS: 07.04.2025; Views: 64; Downloads: 18
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