Relation between carbonation resistance,mix design and exposure of mortar and concrete |
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| Affiliation: | 1. University of La Rochelle, CNRS, LaSIE FRE 3474, Av. M. Crépeau, 17042 La Rochelle Cedex 1, France;2. University of Cergy-Pontoise, L2MGC, 5 Mail Gay-Lussac, 95031 Cergy-Pontoise Cedex, France;1. Department of Chemical Engineering, Imperial College London, South Kensington SW7 2AZ, UK;2. Grantham Institute, Climate Change and the Environment, Imperial College London, South Kensington SW7 2AZ, UK;3. Statistical Advisory Service, Imperial College London, South Kensington SW7 2AZ, UK;4. Institute for Sustainable Futures, University of Technology Sydney, NSW 2007, Australia;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: | When cement with mineral additions is employed, the carbonation resistance of mortar and concrete may be decreased. In this study, mortars containing mineral additions are exposed both to accelerated carbonation (1% and 4% CO2) and to natural carbonation. Additionally, concrete mixtures produced with different cements, water-to-cement ratios and paste volumes are exposed to natural carbonation. The comparison of the carbonation coefficients determined in the different exposure conditions indicates that mortar and concrete containing slag and microsilica underperform in the accelerated carbonation test compared to field conditions. The carbonation resistance in mortar and concrete is mainly governed by the CO2 buffer capacity per volume of cement paste. It can be expressed by the ratio between water added during production and the amount of reactive CaO present in the binder (w/CaOreactive) resulting in a novel parameter to assess carbonation resistance of mortar and concrete containing mineral additions. |
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| Keywords: | Carbonation Accelerated testing Natural exposure Mix design Mortar Concrete |
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