20.500.12556/DiRROS-28833 Under-calcination thermal reactivation of hydrated cement pastes and construction and demolition waste a comparison of different commercial products This study explores the properties of supplementary cementitious materials (SCMs) obtained from the under-calcining thermal reactivation of construction and demolition waste fines (CDW) and of pure hydrated cement pastes (HCPs) derived from different commercial cements (CEM I, CEM II, CEM III, and CEM IV, classified according to EN 197–1). Samples were thermally treated at 350 ◦C (low-energy activation) and 600 ◦C (high-reactivity optimization) to increase pozzolanic and/or hydraulic behavior without inducing CO₂ release from calcination. Phase transformations were analyzed by X-ray Powder Diffraction with Rietveld refinement, thermal behavior by TGA/DTA, and morphological evolution by SEM, while reactivity and hydration kinetics were assessed using isothermal calorimetry. Results indicate pronounced differences in thermal response among the HCPs and CDW, governed by their specific phase assemblages and initial SCM content (limestone, slag, and pozzolans). At the selected under-calcining high-reactivity temperature (600 ◦C), γ-C₂S formation is favored. Thermal reactivation of slag-rich cement (CEM III) yielded the most reactive circular SCM, combining both high hydraulic (260 J/g - EN 196–11) and pozzolanic (329 J/g - ASTM C1897–20) performances with reduced carbon impacts. secondary scms thermal reactivation hydrated cement clinker minerals sekundarni mineralni dodatki termična aktivacija hidratiziran cement klinkerjevi minerali true false true Elsevier Angleški jezik Slovenski jezik © 2026 The Authors Neznano 2026-04-09 07:44:24 2026-04-09 07:49:55 2026-04-10 03:55:35 0000-00-00 00:00:00 2026 0 0 str. 1-18 [article no.] e05978 Vol. 24 Jul. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2026-03-14 620.1/.2 2214-5095 10.1016/j.cscm.2026.e05978 273066755 https://www.sciencedirect.com/science/article/pii/S2214509526002263 1 2cbd9e05-33d7-11f1-b941-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42965 RAZ_Castellini_S._2026.pdf RAZ_Castellini_S._2026.pdf 1 8D184572C94F6FDBD5BC4477257CF06C 4d3b20aee243ce07b3426c2e45c3ed5b50dae0e8aecbadcf136a3c8c0612e831 e5e36a62-33d7-11f1-b941-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=42966 Zavod za gradbeništvo Slovenije 0 0 0