20.500.12556/DiRROS-23418 Multi-scale X-ray techniques for assessing recycled concrete aggregate from XRPD analysis of leftover cement in recycled aggregates to micro-CT imaging of concrete microstructure The content of leftover cement paste is a crucial parameter for determining recycled aggregates quality. Various methods assess this, including wet techniques (acid dissolution, chemical degradation, water absorption), physical approaches (freeze-thaw cycles, mechanical shredding, oven-dried density, thermal disaggregation), and spectroscopic or microscopy analyses. However, these methods often lack accuracy, are time-consuming, or depend on operator skill. A novel X-ray Powder Diffraction and Rietveld quantitative phase analysis approach is introduced to improve measurements precision. Results are compared with multi-scale analyses (microscopy, Xray computed tomography, mechanical testing) on recycled aggregate concrete specimens. Findings highlight a strong correlation between leftover cement paste content and key concrete properties, including microstructure, hydration products, and mechanical performance. This study confirms that leftover cement paste content is a decisive factor in recycled concrete aggregate properties, and that the proposed method offers a rapid and reliable approach to control this parameter. recycled concrete aggregate leftover cement paste CDW X-ray diffraction microstructure recikliran betonski agregat reliktna cementna pasta CDW X-ray difrakcija mikrostruktura true false true Elsevier Angleški jezik Slovenski jezik © 2025 The Authors Neznano 2025-08-27 08:29:42 2025-08-27 08:42:44 2025-10-24 03:54:18 0000-00-00 00:00:00 2025 0 0 str. 1-12 [article no.] 100709 Vol. 23 Oct. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-07-11 620.1/.2 2666-1659 10.1016/j.dibe.2025.100709 245620227 https://www.sciencedirect.com/science/article/pii/S2666165925001097 1 38a324de-830f-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34605 RAZ_Bisciotti_A._2025.pdf RAZ_Bisciotti_A._2025.pdf 1 E048579A322FAA4592CA653D35784855 a6f4e8c77a7d9d77a80c41e9ee4f67b25fd33614de229e890ff1ad345476e74f c8a85dd6-8310-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34607 RAZ_Bisciotti_A._2025.xlsx RAZ_Bisciotti_A._2025.xlsx 1 2762D46C8C5030951C120D24C8F111AC 3d9fbb299af09be1f9509569bd2bd3421ccac9fada1b6bc82109d26c2958110c d427a618-8310-11f0-9bb7-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=34608 Zavod za gradbeništvo Slovenije 0 0 0