3D spatial distribution of the calcium carbonate caused by carbonation of cement paste |
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| Affiliation: | 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 |
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| Abstract: | Carbonation of cement-based materials is one area of concern for the durability of concrete structures. The calcium carbonate caused by carbonation is an important indicator of carbonation degrees. The present paper, using 3D tomography data, proposes a nondestructive method to characterize the 3D spatial distributions of calcium carbonate. It allows monitoring of 3D carbonation evolutions. The evolution of the calcium carbonate distributions in a specimen of cement paste with different carbonation degrees is given using the current method. The results are compared with the average quantity of calcium carbonate determined by thermal analysis. From the sharp edge of the calcium carbonate distribution, we conclude that the accelerated carbonation in this experimental condition is a diffusion controlling process. |
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| Keywords: | Cement-based materials Carbonation Calcium carbonate Tomography |
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