Free,restrained and drying shrinkage of cement mortar composites reinforced with vegetable fibres |
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| Affiliation: | 1. Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, P.O. Box 68506, CEP: 21945-970, Rio de Janeiro, Brazil;2. Department of Civil Engineering, PUC-Rio, Rua Marquês de São Vicente, 225, Gávea, CEP: 22453-900, Rio de Janeiro-RJ, Brazil;3. Instituto Español del Cemento y sus Aplicaciones, C/José Abascal, 53. 28003 Madrid, Spain;4. Department of Civil Engineering, Imperial College of Science Technology and Medicine, Imperial College Road, SW7 2BU London, United Kingdom;1. University of São Paulo, Brazil;2. CSIRO Forestry and Forest Products, Australia;1. Department of Materials and Technology, São Paulo State University (UNESP), Av. Ariberto Pereira da Cunha, 333, 12516-410, Guaratinguetá, SP, Brazil;2. Department of Biosystems Engineering, University of São Paulo (USP), Av. Duque de Caxias Norte, 225, CEP 13635-900, Pirassununga, SP, Brazil;3. Department of Forest Science, Federal University of Lavras (UFLA), P.O. Box 3037, CEP 37200-000, Lavras, MG, Brazil;1. Universidad Autónoma de Nuevo León, UANL, Facultad de Ingeniería Civil, Av. Universidad S/N, Cd. Universitaria, San Nicolás de los Garza, N.L. CP 66451, Mexico;2. University of Toulouse, Laboratoire Matériaux et Durabilite des Constructions, Complexe Scientifique de Rangueil, 135 Av. de Rangueil, 31077 Toulouse cedex 4, France;1. Department of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD, UK;2. School of Civil, Environmental and Mining Engineering, The University of Adelaide, Engineering North N136, North Terrace Campus, SA 5005, Australia;1. University of Windsor, Windsor, Ontario, Canada;2. MEDA Limited, Windsor, Ontario, Canada;1. Departament d’Enginyeria Tèxtil i Paperera, Universitat Politècnica de Catalunya – Barcelona TECH, C/Colom, 11, E-08222 Terrassa, Spain;2. Departament d’Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya – Barcelona TECH, Avinguda del Canal Olímpic, 15, E-08860 Castelldefels, Spain;3. Department of Civil Engineering, Federal University of Rio de Janeiro (COPPE/UFRJ), P.O. Box 68506, 21945-970 Rio de Janeiro, Brazil |
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| Abstract: | Many investigations are realized to establish the basic mechanical properties of vegetable fibre reinforced composites (VFRC) but not their shrinkage and creep behaviour. Some works have been realized to establish the shrinkage of cement mortar matrices reinforced with cellulose fibres, but very few results has been published with regards to shrinkage of VFRC with short sisal and coconut fibres. In this paper a concise summary of several investigations is presented to establish the influence of sisal and coconut fibres on the free and restrained plastic shrinkage, early drying shrinkage cracking, crack self-healing and long-term drying shrinkage of mortar matrices. The free and restrained shrinkage were studied by subjecting the specimens to wind speed of 0.4–0.5 m/s at 40 °C temperature for up to 280 min. The self healing of cracks of the VFRC was studied by using the same specimens as for the study of restrained shrinkage which were kept further in a controlled environment with 100% relative humidity and temperature of 21 °C for up to 40 days. Drying shrinkage tests were carried out at room temperature with about 41% relative humidity for 320 days. The influence of curing method, mix proportions and partial replacement of ordinary Portland cement (OPC) by ground granulated blast-furnace slag and silica fume on the drying shrinkage of VFRC was also investigated. Finally, based on the obtained results on drying shrinkage an equation using the recommendation of ACI model B3 was adjusted and compared well with the obtained experimental data. |
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