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Circular Economy
need for any additive (particle density = 1.53 g/cm3), so the addition of OP has led to a slight increase in density in this material (1.67 g/cm3). However, both WC and YC are non-expansive clays, whose aggregates present a relatively high density, very close to the limit established by the standard EN-13055-1:2002 (2.0 g/cm3). Unlike what was observed in BC, the addition of the olive pomace residue in YC and WC has allowed us to obtain LWAs of excellent quality. It is remarkable the variety manufactured with 97.5% YC + 2.5% OP, which has expanded more than 20%, resulting in a highly porous structure of very low density (1.00 g/cm3), and an acceptable mechanical strength (2.3 MPa).
These results would demonstrate that the olive pomace could have great potential as an additive in non-self-expanding raw materials to obtain very low density LWAs, whose applications are far superior to those of natural aggregates and traditional ceramics.
4. Acknowledgment
This research has been carried out as part of the project “Implementación de una alternativa sostenible para la gestión integral del alpeorujo, un residuo contaminante de la industria oleícola (CTM2016-75977-R)”, funded by the Spanish Ministry of Economy and Competitiveness and FEDER (MINECO-FEDER). The authors also acknowledge with gratitude the technical and human support provided by the CICT of the University of Jaén (UJA, MINECO, Junta de Andalucía, FEDER).
5. References
Dondi, M., Cappelletti, P., D’Amore, M., de Gennaro, R., Graziano, S.F., Langella, A., Raimondo, M., Zanelli, C (2016). Lightweight aggregates from waste materials: Reappraisal of expansion behavior and prediction schemes for bloating. Constr. Build. Mater. 127, pp. 394–409.
EN 13055-1: 2002. Lightweight aggregates. Part 1: Lightweight aggregates for concrete, mortar and grout. European Committee for Standardization.
Lett, L.A., (2014), Global threats, waste recycling and the circular economy concept. Rev Argent Microbiol. 46 (1), pp. 1-2.
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