Impact of accelerated carbonation on OPC cement paste blended with fly ash |
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| Affiliation: | 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;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: | Cement is a huge carbon dioxide producer. Supplementary cementitious materials can help reduce this outcome. However, carbonation of these blended cements remains an active subject of research. Accelerated carbonation tests (10% CO2, 25 °C and 62% RH) are performed on fly ash blended cement pastes. Experiments are performed at varying ages of carbonation (1 to 16 weeks) to measure the evolution of the carbonation depth over time and to quantify key parameters: thermogravimetric analysis (TGA), mercury intrusion porosimetry (MIP) and gamma ray attenuation method (GRAM). The total porosity decreases with a rearrangement of the microstructure due to carbonation and the creation of big capillary pores for the paste with the highest contents of fly ash (60 vol.%). The C-S-H molar volume evolution during fly ash-blended cement carbonation is calculated using a method combining MIP, TGA and GRAM formerly successfully applied to OPC paste in a paper published in the same journal. |
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