The fundamental objective of this study was to define such a cement composite with the addition of white (ladle) slag, which will provide functionality for selected purposes and furthermore, prevent the leaching of toxic elements into the environment. The recovery (recycling) of secondary metallurgical slags from stainless steel production has an important synergistic impact on the environment. In this study, detailed characterization of slag derived from two different ladle refining processes of stainless steel production has been performed. In order to assess its potential for use as a supplementary cementitious material, slag cement composites as well as slag itself were investigated. A comparative study of reference cement composites and cement composites to which a conventional supplementary cementitious material (limestone filler) had been added, was also performed. The results showed that the slag contains hydraulic phases to a total amount of about 50 %. Calcium aluminates are the predominant constituents. In the case of slag cement composites, a larger degree of strength development was observed in comparison to the cement composite with the addition of limestone filler. This was attributed to the larger proportion of hydration products formed in the slag cement composite. The environmental impact of cement composite with the addition of the investigated slag was further evaluated. The results revealed that chromium was immobilized in the cement composites with the addition of slag. Cr(VI) content originating from the cement was also appreciably reduced by the added slag, which thus had significant positive environmental effects. The stabilization process is controlled by the reducing and hydraulic properties of the slag. It was demonstrated that the presence of the investigated slag in cement composites does not influence its durability. The investigated white (ladle) slag can be implemented in cement composites as supplementary cementitious material.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 7105889Meeting of Geologists of Slovenia is a national biannual scientific and professional event, which is organized in the form of lectures and poster presentations in three concurrent sessions. It is organized by the Department of Geology, NTF, University of Ljubljana, and members of the research group are involved in planning and executing of the event at all organizational levels.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 1236318In 2015, members of the Programme Group organized 12 geological workshops at educational institutions across the country, involving levels from kindergarden to secondary school. This way we promoted science and geology in the general public, we raised awareness among younger generations of the importance of geology and natural sciences for the society, and stimulated interest of school kids to pursue a career in natural sciences.
D.10 Educational activities
COBISS.SI-ID: 1181790The main regional structures in the Dinarides where accumulated lithospheric stress has been relaxed are NW-SE trending Dinaric faults. The research involves kinematic and dynamic analysis of fault-slip data on the territory of the NW External Dinarides, including Middle Triassic to Middle Miocene strata. Four major Tertiary-Quaternary tectonic phases have been documented. Paleostress analysis of fault-slip data shows general stress orientations, which have been correlated by relevant mesoscopic scale deformations. Relative chronology of tectonic phases is based on field observations of structural relationships. Tectonic phases have been placed in wider geodynamic context. The oldest phase is characterized by NE-SW directed compression in compressional stress regime, which has been attributted to Paleogene thrusting of the External Dinarides. The second phase is characterized by NE-SW oriented tension in extensional stress regime, which can be attributed to an influence of Middle Miocene extension in the Pannonian basin. The third phase is marked by E-W compression with N-S oriented tension in strike-slip stress regime, which could reflect cessation of subduction processes in Carpathians. The fourth phase shows N-S oriented compression with E-W oriented tension in strike-slip stress regime, which coincides with recent stress state of the region.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 1197150