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Abstract: Dredged river sediments are currently a waste material which is mainly landfilled or reintegrated into rivers. They can also be used as a renewable resource for the construction sector. Pre- treatments at high temperatures allow their use for more advanced applications such as supplementary cementitious materials (SCMs) or as a precursor for alkali activated materials (AAMs). The work presented here shows that flame synthesis can be used to almost completely vitrify such sediments and increase their leachability for Al and Si beyond the levels achieved by conventional calcination at 750–950 ◦C for 1h. The reactivity of the prepared samples was analyzed via the Si and Al solubility in 10 M NaOH and was generally increased by the applied treatments but maximized by flame synthesis. Their microstructure was analyzed using scanning electron microscopy and their phase composition was monitored using X-ray diffraction. The results show an almost complete amorphization of the sediments by flame synthesis, however their reactivity does not increase at the same rate.
Keywords: sediments, SCM, vitrification, properties
Published in DiRROS: 23.05.2024; Views: 582; Downloads: 348
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Keywords: varstvo gozdov, morfološke analize, program preiskav, Fusarium circinatum, Pinus, borov smolasti rak, PCR
Published in DiRROS: 23.05.2024; Views: 401; Downloads: 0
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Abstract: The peopling of Europe during the Middle Pleistocene is a debated topic among paleoanthropologists. Some authors suggest the coexistence of multiple human lineages in this period, while others propose a single evolving lineage from Homo heidelbergensis to Homo neanderthalensis. The recent reassessment of the stratigraphy at the Sedia del Diavolo (SdD) site (Latium, Italy), now dated to the beginning of marine isotope stage (MIS) 8, calls for a revision of the human fossils from the site. In this paper, we present the morphometric, biomechanical and palaeopathological study of the second right metatarsal SdD2, to both re-evaluate its taxonomical affinities and possibly determine the levels of physical activity experienced by the individual during lifetime. Results demonstrate the persistence of archaic features in SdD2 suggesting new insights into the technology and hunting strategies adopted by Homo between MIS 9 and MIS 8.
Keywords: anthropology, evolution, palaeontology
Published in DiRROS: 23.05.2024; Views: 472; Downloads: 499
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Keywords: varstvo gozdov, morfološke analize, Abies alba, Viscum abietis, Mellapsora caryophyllacearum, morfološka analiza
Published in DiRROS: 23.05.2024; Views: 497; Downloads: 198
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Keywords: varstvo gozdov, morfološke analize, Carpinus betulus, Phaeoacremonium fraxinopennsylvanicum, Anisandrus dispar, javna gozdarska služba
Published in DiRROS: 23.05.2024; Views: 353; Downloads: 252
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