Porous structure and mechanical strength of cement-lime pastes during setting |
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| Affiliation: | 1. Université Paris-Est, Laboratoire Navier (ENPC-IFSTTAR-CNRS), Champs sur Marne, France;2. ICB, UMR 5209 CNRS, Université de Bourgogne, Dijon, France;3. LHOIST Recherche et Développement, Nivelles;4. LHOIST France, Paris, France;5. BCB Lhoist Sud Europe, Besançon, France;1. Institute of Applied Geosciences, Graz University of Technology, Rechbauerstraße 12, 8010, Graz, Austria;2. Institute of Technology and Testing of Building Materials, Graz University of Technology, Inffeldgasse 24, 8010, Graz, Austria;3. Leibniz Institute for Baltic Sea Research (IOW), Seestraße 15, D-18119 Warnemünde, Germany;4. RESOURCES—Institute for Water, Energy and Sustainability, 8010, Graz, Austria;5. Institute of Molecular Biosciences, Graz Karl-Franzens University, Humboldstraße 50, 8010, Graz, Austria;6. Institute of Earthsciences, Graz Karl-Franzens University, Heinrichstraße 26, 8010, Graz, Austria;7. Department of Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, NJ 08854-8066, USA;1. State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai 200240, China;3. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China;4. Institute for Building Materials, ETH Zurich, Zurich 8093, Switzerland;5. School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia |
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| Abstract: | The acceleration of a cement paste setting as a result of lime addition may be shown from isothermal calorimetry measurements. We investigated the underlying mechanisms through two techniques that provide information on porous structure (using Nuclear Magnetic Resonance) and mechanical properties (elastic modulus measured by rheometry). The correlation of the two sets of results on a cement paste clearly reveals the successive steps of setting, and particularly highlights the so-called induction period. We show that this induction period disappears in the presence of lime, leading to an acceleration of the setting. We also show that beyond some critical concentration of added lime the acceleration of setting is negligible. |
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