Article

Economic and environmental constraints relevant to building aggregates beneficiation plants

Authors:
  • European Defence Agency
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Abstract

In order to meet the specific requirements of the construction industry, an appropriate beneficiation process aimed at enhancing technical characteristics of building aggregates is often required. As it usually occurs, natural raw materials undergo a primary abatement process by means of drilling and blasting or mechanical excavation, followed by one or more size reduction stages and finally wet or dry separation in order to remove unwanted materials. As the beneficiation process is carried on, the technical performances of building aggregates improve, but, on the other hand, production costs and energeticenvironmental burdens increase, as well. The paper will analyse the main economic and energetic-environmental constraints which characterise the building aggregates production streamline, by paying attention to the contribution of the different beneficiation steps and making use of the LCA (Life Cycle Assessment) methodology. In the second part, the paper will deal with alternative low grade sources of building materials, namely secondary materials from building demolition and rubble recycling, as well as rock excavation waste, which could partially replace traditional building aggregates. Also in this case, an energetic-environmental profile of recycled aggregates will be outlined. © (2007) by the Chamber of Mining Engineers of Turkey All rights reserved.

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Parte 1 a -I prodotti e l'offerta di mercato. GEAM, n. 117, Anno XLIII n.1-2
  • Italia
Italia. Parte 1 a -I prodotti e l'offerta di mercato. GEAM, n. 117, Anno XLIII n.1-2, pp.5-14.
Analisi tecnico-economico-ambientale degli aggregati per l'industria delle costruzioni in Italia. Parte 2 a -La stima dei fabbisogni. GEAM, n. 118
  • V Badino
  • G A Blengini
  • K Zavaglia
Badino, V., Blengini, G.A., Zavaglia, K., 2006 b. Analisi tecnico-economico-ambientale degli aggregati per l'industria delle costruzioni in Italia. Parte 2 a -La stima dei fabbisogni. GEAM, n. 118, Anno XLIII n.3, pp.5-16.
Demolition and rubble recycling as a new source of building materials
  • V Badino
  • G A Blengini
  • K Zavaglia
Badino, V., Blengini, G.A., Zavaglia, K., (Singhal, Fytas, Chiwetelu ed.), 2005. Demolition and rubble recycling as a new source of building materials. Proc. XIV International Symposium on Mine Planning and Equipment Selection (MPES 2005). Banff, Canada, (ISSN 1712-3208), pp 64-82.
LCA Istruzioni per l'Uso
  • V Badino
  • G Baldo
Badino, V., Baldo, G., (Esculapio Ed.), 1998. LCA Istruzioni per l'Uso. Bologna: Progetto Leonardo.
Wet processing of demolition rubble with pulsator jigs, Aufbereitungs Technik
  • J W Derks
  • R Moskala
  • U Scheider-Kuhn
Derks, J.W., Moskala, R., Scheider-Kuhn, U., 1997. Wet processing of demolition rubble with pulsator jigs, Aufbereitungs Technik, volume 38, n. 3, pp. 139-143.
Stato dell'arte e risultati di una ricerca sperimentale inerente la valorizzazione e l'impiego nella produzione di calcestruzzo di aggregati riciclati derivanti da rifiuti da costruzione e demolizione
  • E Garbarino
Garbarino, E., 2005. Stato dell'arte e risultati di una ricerca sperimentale inerente la valorizzazione e l'impiego nella produzione di calcestruzzo di aggregati riciclati derivanti da rifiuti da costruzione e demolizione. PhD thesis. Politecnico di Torino.
Sostenibilità della produzione di materiali per l'industria delle costruzioni: LCA del calcestruzzo
  • Marta Spina
Marta Spina, C., 2004. Sostenibilità della produzione di materiali per l'industria delle costruzioni: LCA del calcestruzzo. Master Degree thesis. Politecnico di Torino.