Separation processes to improve the quality of recycled concrete aggregates (RCAs)

• Autores: Ali Akbarnezhad
• Localización: Handbook of recycled concrete and demolition waste / Fernando Pacheco-Torgal (ed. lit.), Vivian W.Y. Tam (ed. lit.), Joao Labrincha (ed. lit.), Yining Ding (ed. lit.), Jorge de Brito (ed. lit.), 2013, ISBN 978-0-85709-682-1, págs. 246-269
• Idioma: inglés
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• Resumen

  • After undergoing a number of conventional cycles of crushing and sieving, coarse recycled concrete aggregates (RCA) particles generally comprise one or more particles of natural coarse aggregates surrounded fully or partially by a layer of mortar and/or cement paste. Some of the RCA particles may even be just lumps of mortar embedded with smaller sized natural aggregates (NA). It is this presence of mortar that has been reported as the main factor contributing to quality issues relating to RCA. This chapter begins by discussing how reducing mortar content can improve the properties of RCA and recycled aggregate concrete (RAC). It makes references to available international standards and reviews and compares various state-of-art, effective and innovative beneficiation processes available.