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 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.
Highlights
Depletion of fossil fuel energy sources is becoming every day a noteworthy problem, both its environmental impact generated and the technology dependence on fossil energy [1]
Chamotte, ground granulated blast furnace slag, iron silicate, and steel slag are composed by irregular polyhedral shape particles with sharp corners and edges, whether regular
Chamotte, ground granulated blast furnace slag, iron silicate, and steel slag are composed chamotte, ground granulated blast furnace slag, iron silicate, and steel slag are composed by irregular polyhedral shape particles with sharp corners and edges, whether regular by irregular polyhedral shape particles with sharp corners and edges, whether regular circular shape particles compose silica fume
Summary
Depletion of fossil fuel energy sources is becoming every day a noteworthy problem, both its environmental impact generated and the technology dependence on fossil energy [1]. Among the different technology options to harness solar energy, concentrating solar power is one of them, which converts the heating generated by the sun into electricity. One drawback of solar energy is that when the sun sets or the meteorological conditions are not favorable, the energy demand cannot be covered, leading to the implementation of thermal energy storage tanks in concentrating solar power (CSP) plants to ensure continuous energy demand [4,5]. Cutting edge energy storage sensible heat materials were studied, highlighting in CSP applications the commonly used molten salts [6,7]. In this context, are distinguished two possible storage media materials, in liquid and solid. Within potential sensible heat storage (SHS) materials, concrete shows attractive properties to be used as thermal energy storage materials at high temperature [9]
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