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Keywords = calcium silicoaluminate glasses

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26 pages, 8723 KB  
Article
Characterization of Supplementary Cementitious Materials and Fibers to Be Implemented in High Temperature Concretes for Thermal Energy Storage (TES) Application
by Laura Boquera, David Pons, Ana Inés Fernández and Luisa F. Cabeza
Energies 2021, 14(16), 5190; https://doi.org/10.3390/en14165190 - 22 Aug 2021
Cited by 11 | Viewed by 4032
Abstract
Six supplementary cementitious materials (SCMs) were identified to be incorporated in concrete exposed to high-temperature cycling conditions within the thermal energy storage literature. The selected SCMs are bauxite, chamotte, ground granulated blast furnace slag, iron silicate, silica fume, and steel slag. A microstructural [...] Read more.
Six supplementary cementitious materials (SCMs) were identified to be incorporated in concrete exposed to high-temperature cycling conditions within the thermal energy storage literature. The selected SCMs are bauxite, chamotte, ground granulated blast furnace slag, iron silicate, silica fume, and steel slag. A microstructural characterization was carried out through an optical microscope, X-ray diffraction analysis, and FT-IR. Also, a pozzolanic test was performed to study the reaction of SCMs silico-aluminous components. The formation of calcium silica hydrate was observed in all SCMs pozzolanic test. Steel slag, iron silicate, and ground granulated blast furnace slag required further milling to enhance cement reaction. Moreover, the tensile strength of three fibers (polypropylene, steel, and glass fibers) was tested after exposure to an alkalinity environment at ambient temperature during one and three months. Results show an alkaline environment entails a tensile strength decrease in polypropylene and steel fibers, leading to corrosion in the later ones. Full article
(This article belongs to the Special Issue Performance and Optimization of Solar Thermal Energy Storage Systems)
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14 pages, 9794 KB  
Article
Waste and Solar Energy: An Eco-Friendly Way for Glass Melting
by Isabel Padilla, Maximina Romero, José I. Robla and Aurora López-Delgado
ChemEngineering 2021, 5(2), 16; https://doi.org/10.3390/chemengineering5020016 - 8 Apr 2021
Cited by 10 | Viewed by 4613
Abstract
In this work, concentrated solar energy (CSE) was applied to an energy-intensive process such as the vitrification of waste with the aim of manufacturing glasses. Different types of waste were used as raw materials: a hazardous waste from the aluminum industry as aluminum [...] Read more.
In this work, concentrated solar energy (CSE) was applied to an energy-intensive process such as the vitrification of waste with the aim of manufacturing glasses. Different types of waste were used as raw materials: a hazardous waste from the aluminum industry as aluminum source; two residues from the food industry (eggshell and mussel shell) and dolomite ore as calcium source; quartz sand was also employed as glass network former. The use of CSE allowed obtaining glasses in the SiO2-Al2O3-CaO system at exposure time as short as 15 min. The raw materials, their mixtures, and the resulting glasses were characterized by means of X-ray fluorescence, X-ray diffraction, and differential thermal analysis. The feasibility of combining a renewable energy, as solar energy and different waste for the manufacture of glasses, would highly contribute to circular economy and environmental sustainability. Full article
(This article belongs to the Special Issue Concentrated Solar Energy for Materials)
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