Mechanical and elastic behaviour of concretes made of recycled-concrete coarse aggregates |
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| Affiliation: | 1. Western Sydney University, School of Computing, Engineering and Mathematics and Institute for Infrastructure Engineering, Locked Bag 1797, Penrith, NSW 2751, Australia;2. Nakhon Ratchasima Rajabhat University, Suranarai Rd, Muang, Nakhon Ratchasima 30000, Thailand;3. Department of Structural Engineering, Tongji University, Shanghai 200092, PR China;1. Department of Civil Engineering and Architecture, IST-Technical University of Lisbon, Av. Rovisco Pais, 1049?001 Lisbon, Portugal;2. Department of Civil Engineering and Architecture, IST-Technical University of Lisbon, Av. Rovisco Pais, 1049?001 Lisbon, Portugal;3. CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049?001 Lisbon, Portugal;4. CERIS, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049?001 Lisbon, Portugal;5. Opway, Rua Professor Fernando da Fonseca-Edifício Visconde de Alvalade, 5°, 1600?616 Lisbon, Portugal;1. Dept. of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield S1 3JD, UK;2. Dept. of Civil Techniques, Erbil Polytechnic University, Kirkuk Road, Erbil, Iraq;1. Department of Civil Engineering, University of Salerno, via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy;2. Department of Civil Engineering, COPPE, Federal University of Rio de Janeiro, P.O. Box 68506, CEP: 21945-970 Rio de Janeiro, Brazil;3. Faculty of Civil Engineering and Geosciences, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, The Netherlands |
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| Abstract: | In this paper an investigation of mechanical behaviour and elastic properties of recycled-aggregate concretes is presented. These concretes were prepared by alternatively using two different (coarse and finer coarse) recycled-aggregate fractions both made of recycled concrete coming from a recycling plant in which rubble from demolition is collected and suitably treated. Several concrete mixtures were prepared by using only virgin aggregates (as reference), 30% finer coarse recycled aggregate replacing fine gravel and 30% coarse recycled aggregate replacing gravel. Five different water to cement ratios were adopted as: 0.40, 0.45, 0.50, 0.55 and 0.60. Concrete workability was in the slump range of 190–200 mm. Compression tests were carried out after 28 days of wet curing. In addition, concrete elastic modulus and drying shrinkage were evaluated. Results obtained showed that structural concrete up to C32/40 strength class can be manufactured by replacing 30% virgin aggregate with recycled-concrete aggregate. Moreover, a correlation between elastic modulus and compressive strength of recycled-aggregate concrete was found and compared to those reported in the literature. Finally, on the basis of drying shrinkage results, particularly if finer coarse recycled-concrete aggregate is added to the mixture, lower strains could be detected especially for earlier curing time. |
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