As sustainability is becoming a fundamental requirement for all modern industrial processes, modern environmental policies should also deal with enhancing the efficiency in the use of raw materials and reducing CO2 emissions. Alternative sources for cementitious materials and natural aggregates for concrete production are recently emerging and gaining the interest of concrete industry. At the COPPE-UFRJ a research line is under development with the main aim to develop “ecological concrete” solutions, characterised by a significant replacement of traditional cement and by replacing natural aggregates with recycled aggregates from demolition waste. In this paper, the preliminary results of this research line are reported. The possible impact of alternative processing procedures to produce recycled aggregates from construction demolition waste are discussed. The particle size distribution as well as the associated water absorption capacities are evaluated and considered in the mix design. A series of experiments are conducted on different concrete samples, at both fresh and hardened states. Test results are discussed and compared to the results of a reference mixture. The activities presented in this paper are framed within the EU-funded network on the topic of “Environmentally-friendly solutions for Concrete with Recycled and natural components” (www.encore-fp7.unisa.it).

Designing concrete with recycled ecological aggregates

PEPE, MARCO;MARTINELLI, Enzo;
2013-01-01

Abstract

As sustainability is becoming a fundamental requirement for all modern industrial processes, modern environmental policies should also deal with enhancing the efficiency in the use of raw materials and reducing CO2 emissions. Alternative sources for cementitious materials and natural aggregates for concrete production are recently emerging and gaining the interest of concrete industry. At the COPPE-UFRJ a research line is under development with the main aim to develop “ecological concrete” solutions, characterised by a significant replacement of traditional cement and by replacing natural aggregates with recycled aggregates from demolition waste. In this paper, the preliminary results of this research line are reported. The possible impact of alternative processing procedures to produce recycled aggregates from construction demolition waste are discussed. The particle size distribution as well as the associated water absorption capacities are evaluated and considered in the mix design. A series of experiments are conducted on different concrete samples, at both fresh and hardened states. Test results are discussed and compared to the results of a reference mixture. The activities presented in this paper are framed within the EU-funded network on the topic of “Environmentally-friendly solutions for Concrete with Recycled and natural components” (www.encore-fp7.unisa.it).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/3996052
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