Influential factors in volume change measurements for cementitious materials at early ages and in isothermal conditions |
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| Affiliation: | 1. AREVA, Waste and Dismantling Project Management Division, 1 Place Jean Millier, 92400 Courbevoie, France;2. CRIB, Université LAVAL: Département de génie civil - Pavillon Adrien-Pouliot - 1065, av. de la Médecine Québec, Québec G1V 0A6, Canada;3. Université Paris-Est, IFSTTAR, 14-20 Boulevard Newton, Cité Descartes, Champs sur Marne, F-77447 Marne la Vallée Cedex 2, France;4. LMT, Ecole Normale Supérieure de Cachan, 61, avenue du président Wilson, 94235 Cachan cedex, France;1. LUNAM Université, Université d’Angers/UMR CNRS 6200, MOLTECH-Anjou, 2, bd Lavoisier, 49045 Angers, France;2. Centre for Disruptive Photonic Technologies, Nanyang Technological University, 50, Nanyang Avenue, Singapore 637371, Singapore;3. Department of Polymer Engineering and Technology, Wroclaw University of Technology, Faculty of Chemistry, 50-70 Wroclaw, Poland;1. Castle Hill Medical Centre, Queensland;2. Discipline of General Practice, School of Medicine, University of Queensland |
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| Abstract: | Early age deformations, when restrained, lead to an increase of cracking risk of the material, especially in the case of high strength materials to which we apply modern high energy mixing techniques which accelerate initial hydration rate. The experimental campaign aims to investigate and understand the differences not yet explained between several autogenous measurement techniques, such as the initial swelling measured by the linear devices that is not observed in the case of volumetric measurements. The differences between the results obtained by means of devices when values are zeroed at setting time can be imputed to the intrinsic behaviour of the material within the well-defined boundary conditions imposed by the molds, and not only to the measurement artefact. |
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| Keywords: | Cement Mortar Chemical shrinkage Autogenous shrinkage Early age |
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