| Title: | 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 |
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| Authors: | ID Bisciotti, A. (Author)
ID Mancini, Lucia (Author)
ID Viani, Alberto (Author)
ID Zalar Serjun, Vesna (Author)
ID Mladenovič, Ana (Author)
ID Cruciani, Giuseppe (Author) |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S2666165925001097
 PDF - Presentation file, download (8,35 MB)
MD5: E048579A322FAA4592CA653D35784855
 XLSX - Supplement, download (12,43 KB)
MD5: 2762D46C8C5030951C120D24C8F111AC
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | 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. |
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| Keywords: | recycled concrete aggregate, leftover cement paste, CDW, X-ray diffraction, microstructure |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 11.07.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2025 |
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| Number of pages: | str. 1-12 |
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| Numbering: | Vol. 23, [article no.] 100709 |
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| PID: | 20.500.12556/DiRROS-23418  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 2666-1659 |
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| DOI: | 10.1016/j.dibe.2025.100709 |
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| COBISS.SI-ID: | 245620227 |
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| Copyright: | © 2025 The Authors |
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| Publication date in DiRROS: | 27.08.2025 |
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| Views: | 339 |
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| Downloads: | 219 |
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