Browsing by Author "Arribas, Idoia"
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Item Durability studies on steelmaking slag concretes(2014-11) Arribas, Idoia; Vegas, Iñigo; San-Jose, Jose Tomas; Manso, Juan M.; TRAZABILIDAD CIRCULAR; GENERALElectric-arc furnace slag is proposed as a substitute for the conventional aggregate used in classical structural concrete. In the present research is studied the durability of these slag aggregate concretes and their resistance to both physical (freeze–thaw, high temperature and relative humidity) and chemical degradation (sulfate attack, alkali–aggregate reaction and marine environment), as well as their resistance to the corrosion of steel reinforcement bars (an assessment of the risks of corrosion) embedded in the concrete matrix. This approach requires laboratory studies. The main objective of this work focuses on evaluating the durability of slag concrete under the conditions specified in the Spanish structural concrete code. In general terms, the behavior of the concrete with slag aggregate was similar to or better than the reference concrete (natural aggregate), except in case of exposure to marine environments and seawater, which resulted in quicker chloride penetration. The study confirms the viability of producing steel-reinforced concrete with slag aggregate.Item ELECTRIC ARC FURNACE SLAG AND ITS USE IN HYDRAULIC CONCRETE(2015-08-15) Arribas, Idoia; Santamaria, Amaia; Ruiz, Estela; Ortega-Lopez, Vanesa; Manso, Juan M.; TRAZABILIDAD CIRCULARElectric arc furnace oxidizing slag (EAFS) is a by-product of the steelmaking industry, generated after the melting and the preliminary acid refining of liquid steel. It is a stony material that is easy to crush for use as aggregate in concrete mixes. This study examines the long-term aging reactions of EAFS and its volumetric stability, to gain further knowledge of this by-product, its behaviour as a construction material, and its inherent risk of swelling. Additionally, the good compressive strength of hydraulic mixes that incorporate this slag can be analyzed and explained on the basis of its steady and expansive compounds and its chemical evolution over time in the interfacial transition zone (ITZ); the appearance of calcium carbonate enhances the cohesiveness, stiffness and strength of this zone and, as a consequence, of the hydraulic concreteItem The performance of steel-making slag concretes in the hardened state(2014-08) San-Jose, Jose Tomas; Vegas, Iñigo; Arribas, Idoia; Marcos, Ignacio; GENERAL; TRAZABILIDAD CIRCULARThe use of oxidizing slag from electric-arc furnaces as an aggregate is a sustainable option in the manufacture of concrete, the performance of which is similar to an ordinary aggregate concrete. This study examines the reuse of two different types of oxidizing slag in concretes designed for use in structural components and compares their performance against relevant specifications contained in current working standards. Fundamental aspects are discussed, among which density and workability that are related to the proportioning of the concrete and its mechanical and physical properties. The results show that overall concrete quality is maintained and that its performance is acceptable for the proposed applicationItem 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.