31. Effect of the cooling regime on the mineralogy and reactivity of belite-sulfoaluminate clinkersSabina Dolenec, Katarina Šter, Maruša Mrak, Klara Žagar, Andrej Ipavec, Lea Žibret, 2020, original scientific article Abstract: This study investigated the influence of different cooling regimes on the microstructure and consequent reactivity of belite-sulfoaluminate clinkers. The cement clinkers were synthesized by incorporating secondary raw materials, such as titanogypsum and bottom ash, to the natural raw materials. Clinker phases were determined by Rietveld quantitative phase analysis, while the distribution morphology and the incorporation of substitute ions in the phases were characterized by scanning electron microscopy using energy-dispersive X-ray spectroscopy (SEM/EDS). Clinker reactivity was studied using isothermal calorimetry and was additionally investigated through compressive strength, which was determined for the cement prepared from the synthesized clinkers. X-ray diffraction analysis showed that, as well as the three main phases (belite, calcium sulfoaluminate, and ferrite), the clinkers contained additional minor phases (mayenite, gehlenite, arkanite, periclase, and perovskite), the ratios of which varied according to the cooling regime utilized. Microscopic observations indicated that the cooling regime also influenced the crystal size and morphology of the main phases, which consequently affected clinker reactivity. Furthermore, a smaller amount of substitute elements was incorporated in the main phases when cooling was slowed. Results showed that, in comparison to clinkers cooled at slower rates, air quenched clinkers reacted faster and exhibited a higher compressive strength at 7 days.
Keywords: clinkers, belite, calcium sulfoaluminate, cooling, microstructure, reactivity
Published in DiRROS: 20.12.2023; Views: 224; Downloads: 90
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33. Humidity sensing ceria thin-filmsVilko Mandić, Arijeta Bafti, Luka Pavić, Ivana Panžić, Stanislav Kurajica, Jakov-Stjepan Pavelić, Zhen Shi, Katarina Mužina, Ivana Katarina Ivković, 2022, original scientific article Published in DiRROS: 07.11.2023; Views: 234; Downloads: 115
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35. Cene gozdnih lesnih sortimentov iz zasebnih gozdov na slovenskem trgu v maju 2023Katarina Flajšman, Špela Ščap, 2023, professional article Keywords: gozdarstvo, gozdovi, gozdni lesni sortimenti, odkupne cene, okrogli les, les za kurjavo, zasebni gozdovi
Published in DiRROS: 18.08.2023; Views: 396; Downloads: 116
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36. The Incorporation of steel slag into belite-sulfoaluminate cement clinkersLea Žibret, Katarina Šter, Maruša Mrak, Mojca Loncnar, Sabina Dolenec, 2021, original scientific article Abstract: The potential use of steel slag from treated steel slag in belite-sulfoaluminate cements was investigated in this study. Cement clinkers with two phase compositions were synthesized, allowing the incorporation of different amounts of steel slag. The phase composition and microstructure of cement clinkers at three different sintering temperatures were studied by X-ray powder diffraction and the Rietveld method, as well as scanning electron microscopy with energy dispersive spectrometry. The results showed that the targeted phase composition of clinkers was achieved at a sintering temperature of 1250%C. However, a higher amount of perovskite instead of ferrite was detected in the clinker with a higher content of Ti-bearing bauxite. Apart from the main phases, such asbelite, calcium sulfoaluminate, and ferrite, several minor phases were identified, including mayenite, perovskite, periclase, and alkali sulfates. In both clinker mixtures, a higher content of MgO in the steelslags resulted in the formation of periclase. Furthermore, the hydration kinetics and compressive strength at 7 and 28 days were studied in two cements prepared from clinkers sintered at 1250%C. As evidenced by the results of isothermal calorimetry, the hydration kinetics were also influenced by the minor clinker phases. Cement with a higher content of calcium sulfoaluminate phase developed a higher compressive strength.
Keywords: cements, BCSA, steel slag, secundary row materials, microstructure, clinker phase
Published in DiRROS: 01.08.2023; Views: 272; Downloads: 127
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37. Aktualne cene gozdarskih storitev v Sloveniji - marec 2023Katarina Flajšman, Matevž Triplat, 2023, professional article Keywords: gozdarstvo, gozdovi, gozdarske storitve, cene, sečnja, spravilo lesa, prevoz lesa
Published in DiRROS: 27.07.2023; Views: 544; Downloads: 129
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38. Mednarodni dan gozdov : izsledki našega delaŠpela Ščap, Jaša Saražin, Matevž Triplat, Peter Prislan, Katarina Flajšman, Urban Žitko, Amina Gačo, Darja Stare, Marjan Dolenšek, 2023, professional article Keywords: gozdarstvo, gozdovi, les, dan gozdov, pregled dela
Published in DiRROS: 27.07.2023; Views: 423; Downloads: 110
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39. Cene gozdnih lesnih sortimentov iz zasebnih gozdov na slovenskem trgu v februarju 2023Katarina Flajšman, Špela Ščap, 2023, professional article Keywords: gozdarstvo, gozdovi, gozdni lesni sortimenti, odkupne cene, okrogli les, les za kurjavo, zasebni gozdovi
Published in DiRROS: 27.07.2023; Views: 354; Downloads: 132
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40. Pregled nad cenami gozdnih lesnih sortimentov v letu 2022Špela Ščap, Katarina Flajšman, 2023, professional article Keywords: gozdarstvo, gozdovi, gozdni lesni sortimenti, odkupne cene, okrogli les, industrijski les, les za kurjavo
Published in DiRROS: 27.07.2023; Views: 359; Downloads: 114
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