Characterization of Supplementary Cementitious Materials and Fibers to Be Implemented in High Temperature Concretes for Thermal Energy Storage (TES) Application

Laura Boquera, David Pons, Ana Inés Fernández and Luisa F. Cabeza
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Laura Boquera: CIRIAF-Interuniversity Research Centre on Pollution and Environment Mauro Felli, Via G. Duranti 63, 06125 Perugia, Italy
David Pons: Departament de Ciència de Materials i Química Física, Ciència i Enginyeria de Materials, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
Ana Inés Fernández: Departament de Ciència de Materials i Química Física, Ciència i Enginyeria de Materials, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
Luisa F. Cabeza: GREiA Research Group, Universitat de Lleida, Pere de Cabrera s/n, 25001 Lleida, Spain

Energies, 2021, vol. 14, issue 16, 1-26

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.

Keywords: supplementary cementitious materials; fibers; thermal energy storage; sensible heat storage technology; concrete (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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