Investigation of the carbonation mechanism of CH and C-S-H in terms of kinetics,microstructure changes and moisture properties |
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| Affiliation: | 1. Université Paris-Est, IFSTTAR, MAT, F-75732 Paris, France;2. Université Paris-Est, Laboratoire Navier, Ecole des Ponts ParisTech, IFSTTAR, CNRS, F-77455 Marne-la-Vallée, France;1. Department of Chemistry, University of Aberdeen, Meston Walk, AB24 3UE Aberdeen, United Kingdom;2. Eduardo Torroja Institute for Construction Science, CSIC, Serrano Galvache 4, 28033 Madrid, Spain;1. CEA, DEN, DPC, SECR, Laboratoire d''Etude du Comportement des Bétons et des Argiles, F-91191 Gif-sur-Yvette, France;2. Université Paris-Est, IFSTTAR, Département Matériaux & Structures, 14-52 Boulevard Newton, F-77447 Marne la Vallée Cedex 2, France;3. CEA, DSM, IRAMIS, NIMBE, Laboratoire Structure et Dynamique par Résonance Magnétique, CEA/CNRS UMR 3299, F-91191 Gif-sur-Yvette, France;4. Andra, Parc de la Croix Blanche, 1-7 rue Jean Monnet, 92298 Chatenay-Malabry Cedex, France;1. Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 C Aarhus, Denmark;2. Laboratory for Concrete & Construction Chemistry, Swiss Federal Laboratories for Materials Science and Technology (Empa), 8600 Dübendorf, Switzerland;3. Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway;4. Aalborg Portland A/S, Cementir Holding S.p.A., 9100 Aalborg, Denmark;1. Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, USA;2. Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ, USA;3. Université Paris-Est, IFSTTAR, MAT, F-75732 Paris, France;4. Université Paris-Est, Laboratoire Navier, Ecole des Ponts ParisTech, IFSTTAR, CNRS, F-77455 Marne-la-Vallée, France;5. DGAC/STAC, F-94485 Bonneuil-sur-Marne, France |
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| Abstract: | The purpose of this article is to investigate the carbonation mechanism of CH and C-S-H within type-I cement-based materials in terms of kinetics, microstructure changes and water released from hydrates during carbonation. Carbonation tests were performed under accelerated conditions (10% CO2, 25 °C and 65 ± 5% RH). Carbonation profiles were assessed by destructive and non-destructive methods such as phenolphthalein spray test, thermogravimetric analysis, and mercury intrusion porosimetry (destructive), as well as gamma-ray attenuation (non-destructive). Carbonation penetration was carried out at different ages from 1 to 16 weeks of CO2 exposure on cement pastes of 0.45 and 0.6 w/c, as well as on mortar specimens (w/c = 0.50 and s/c = 2). Combining experimental results allowed us to improve the understanding of C-S-H and CH carbonation mechanism. The variation of molar volume of C-S-H during carbonation was identified and a quantification of the amount of water released during CH and C-S-H carbonation was performed. |
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