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

Six supplementary cementitious materials (SCMs) were identified to be incorporated in concrete exposed 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, FT-IR. Also, a pozzolanic test performed study reaction of silico-aluminous components. formation calcium hydrate observed all test. Steel slag required further milling enhance cement reaction. Moreover, tensile strength three fibers (polypropylene, steel, glass fibers) tested after exposure alkalinity environment at ambient temperature during one months. Results show alkaline entails decrease polypropylene fibers, leading corrosion later ones.