from XRPD analysis of leftover cement in recycled aggregates to micro-CT imaging of concrete microstructure
A. Bisciotti (Author), Lucia Mancini (Author), Alberto Viani (Author), Vesna Zalar Serjun (Author), Ana Mladenovič (Author), Giuseppe Cruciani (Author)

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.

Keywords

recikliran betonski agregat;reliktna cementna pasta;CDW;X-ray difrakcija;mikrostruktura;recycled concrete aggregate;leftover cement paste;, X-ray diffraction;microstructure;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: ZAG - Slovenian National Building and Civil Engineering Institute
Publisher: Elsevier
UDC: 620.1/.2
COBISS: 245620227 Link will open in a new window
ISSN: 2666-1659
Views: 192
Downloads: 143
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Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: recikliran betonski agregat;reliktna cementna pasta;CDW;X-ray difrakcija;mikrostruktura;
Pages: str. 1-12
Volume: ǂVol. ǂ23
Issue: [article no.] 100709
Chronology: Oct. 2025
DOI: 10.1016/j.dibe.2025.100709
ID: 27174951