Influence of recycled coarse aggregates on permeability of fresh concrete |
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| Affiliation: | 1. Centre des Matériaux des Mines d’Alès, Ecole des Mines d’Alès, 6 Avenue de Clavières, 30319 Alès Cedex, France;2. Ecole Nationale Supérieure d’Architecture de Montpellier, 179 rue de l’Espérou, 34093 Montpellier Cedex 5, France;1. BRGM, Environment and Process Division, 3, Avenue Claude Guillemin, F-45060 Orléans Cedex 2, France;2. UMR CNRS 7285 IC2MP, Université de Poitiers, Equipe HydrASA, rue Albert Turpain, Bat B8, 86022 Poitiers, France;3. CNRS-CEMHTI UPR 3079, 1 Avenue de la Recherche Scientifique, 45071 Orléans, Cedex 2 France;4. Andra, 1/7 rue Jean Monnet, Parc de la Croix Blanche, 92298 Châtenay-Malabry Cedex, France;5. Earth and Environmental Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA;1. Unit of Material Technology, University of Innsbruck, Technikerstraße 13, A-6020 Innsbruck, Austria;2. Christian Doppler Laboratory for Performance-Based Optimization of Binder Composition and Concrete Manufacturing, Technikerstraße 13, A-6020 Innsbruck, Austria;1. Bundesanstalt für Materialforschung und -prüfung (BAM), Division 7.4 - Technology of Construction Materials, Unter den, Eichen 87, 12205 Berlin, Germany;2. Bundesanstalt für Materialforschung und -prüfung (BAM), Department 7 - Safety of Structures, Unter den Eichen 87, 12205 Berlin, Germany;1. Department of Civil Engineering, Université de Sherbrooke, Canada;2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, USA;1. CERis-ICIST, Instituto Superior Técnico – Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;2. CERis-ICIST, Department of Civil Engineering, Architecture and Georesources, Instituto Superior Técnico – Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;1. Department of Applied Science and Technology, INSTM Research Unit PoliTO, LINCE Laboratory, Politecnico di Torino, Corso Duca Degli Abruzzi, 24, Italy;2. Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca Degli Abruzzi, 24, Italy |
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| Abstract: | The following work is an experimental study of the behaviour of very early-age concrete. Six different concretes, four of them containing recycled coarse aggregates were studied for the first 2.5 h. The studies were carried out in a ventilated tunnel in order to imitate severe desiccation conditions. In order to indirectly obtain the permeability coefficient, settlement, capillary depression and evaporation were measured for all six concretes. The initial permeability coefficient of each concrete is determined starting from initial bleeding rate. The use of recycled coarse aggregates leads to a high bleeding rate for high water to cement ratios. Permeability coefficients at air entry are then determined starting from capillary depression gradients. Recycled coarse aggregates do not seem to influence the air entry value which is highly dependent on the paste quality. At air entry, the permeability coefficient of recycled coarse aggregates concrete mixes is higher than that of natural aggregates concrete mixes. At high evaporation rates, in severe desiccation conditions, recycled coarse aggregates seem to reduce bleeding for mixture with low water cement ratios. Permeability coefficient is a key physical parameter to understand drying of fresh concrete. |
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| Keywords: | Evaporation rate Capillary depression Bleeding Permeability Air entry |
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