Browsing by Keyword "Addition"
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Item Physical-mechanical behaviour of binary cements blended with thermally activated coal mining waste(2015-11-30) Vegas, Iñigo; Cano, Maria; Arribas, Idoia; Frias, Moises; Rodriguez, Olga; GENERAL; Tecnalia Research & Innovation; TRAZABILIDAD CIRCULARThis research work deals with the technical viability of manufacturing new eco-efficient cement blended with thermally activated coal mining waste (ACMW). The physical–mechanical results obtained in the present work showed that the addition of ACMW (up to 20% of replacement) modified the physical and mechanical properties of the blended cement matrices. The blended cements required a great water demand, slightly accelerated settings times and revealed gain in compressive strengths at early curing times. In general terms, blended cements containing up to 20% ACMW meet the chemical, physical and mechanical requirements set out by the EN 197-1 European standard.Item TiO2 nanoparticle addition into molten steel: From lab scale to Industrial scale(Trans Tech Publications Ltd., 2014) Kaltzakorta, Idurre; Callejo, Lorena M.; Idoyaga, ZuriñeIn this work, the design of a new technology for nanoparticle addition into molten steel that improves the mechanical properties of the material, as well as the upscale of the process, was pursued. The process was scaled from laboratory to industrial level starting from first experiments carried out in pure iron bath, in order to analyze the behavior of nanoparticles in molten metal environment, and finishing with the addition of nanoparticles into microalloyed steel bath as industrial trials. The first steps of the research were performed in the levitation furnace at Tecnalia R&I installations that can cast samples up to 1 kg, continuing with a high vacuum furnace with a capacity up to 35 Kg. By the end of the investigation, the process was scaled up to industrial level at Gerdau facilities.