Browsing by Author "Goiti, Eunate"
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Item Preparation and properties of aluminosilicate aerogels from boehmite and waterglass(2024-03-01) Ocejo, Marta; Goiti, Eunate; Salinas-Garzón, Juan; Ibáñez-Gómez, José Antonio; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓNAluminosilicate aerogels are promising thermal insulation materials for high temperature applications. In this study, aluminosilicate aerogels were effectively synthesised using affordable precursors: dispersible boehmite powder and waterglass solutions, with subsequent drying achieved by supercritical CO2 processing. According to the evaluation of their properties, the Al–Si aerogels exhibited low densities (0.11 g/cm3), low thermal conductivities (<0.021 W/m·K) and high specific surface areas (SSA) (516 m2/g for an Al:Si molar ratio of 3:1). When waterglass-based aerogel and aluminosilicate samples were treated at high temperature (1200 °C), the formation of mullite was demonstrated for the aluminosilicate aerogel with a molar ratio of Al:Si 3:1, which showed a higher value for SSA compared to the waterglass-based aerogel.Item Synthesis of zeolite type analcime from industrial wastes(2020-02) Vigil de la Villa Mencía, Raquel; Goiti, Eunate; Ocejo, Marta; Giménez, Rosario García; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓNA range of industrial wastes (recycled glass, silica fume, siliceous concrete waste aggregates, sterile coal and foundry sand from the steel industry) are employed in the formation of secondary raw materials following their hydrothermal treatment. Composed mainly of zeolites, these secondary materials, in almost all cases, formed analcime. The sterile coal yielded the best defined analcime crystals. In addition, the secondary raw materials are incorporated as an addition in cement paste formulations, to evaluate their effect at early stages of the hydration process. The secondary materials from the siliceous concrete waste aggregates and recycled glass produced a 23% increase in the compressive strength of the paste after 1 day of curing (in comparison with the cement paste reference).Item Thermal assessment of ambient pressure dried silica aerogel composite boards at laboratory and field scale(2016-09-15) Garay, Roberto; Goiti, Eunate; Reichenauer, Gudrun; Zhao, Shanyu; Koebel, Matthias; Barrio, Aitor; Garay Martinez, Roberto; Tecnalia Research & Innovation; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; BIOECONOMÍA Y CO2In the context of increasing energy costs and the need for global reduction of CO2 emissions, the development of superinsulation materials for the construction sector allows the design of low-energy buildings. Since still being in an experimental or at early-commercial stage, R&D of these materials focused on its final application is required, to accelerate access to the market for renovation of the building stock where space is a critical metric. In this paper, the experimental assessment of the thermal performance of a novel ambient pressure dried silica aerogel based composite is presented. In order to provide assessments at both, material and system levels, stress-strain tests, hot plate measurements, as well as full scale tests under realistic boundary conditions were conducted. The overall results are that this material provides good insulation properties (thermal conductivity in the range of 0.015–0.018 W/mK), along with sufficient mechanical properties, and allows for the creation of superinsulating assemblies even at small wall thickness.