titoli, abstracts, parole chiave >>>
Zeolitic tuffs as raw materials for lightweight aggregates

Dondi, Michele and Cappelletti, Piergiulio and Cerri, Guido and De Gennaro, Maurizio and De Gennaro, Roberto and Langella, Alessio (2004) Zeolitic tuffs as raw materials for lightweight aggregates. Key Engineering Materials, Vol. 264-268 (2), p. 1431-1434. ISSN 1013-9826. Article.

Full text not available from this repository.

DOI: 10.4028/www.scientific.net/KEM.264-268.1431

Abstract

The possible use of zeolitic rocks for the production of lightweight aggregates was assessed, investigating both the expansion at high temperature and the technological features of fired products. Eighteen zeolite-bearing rocks from Sardinia, Campania and Tuscany (Italy) were taken into account. The firing expansion depends mainly on the chemical composition (especially silica and fluxing oxides) and the water content (largely related to the zeolite amount). Other relevant parameters are the temperature of maximum expansion (1350-1500°C, without additives) and soaking time (2-5 minutes). Some products are highly impervious (water absorption <1%) and exhibit a considerable firing expansion (>100% vol.), a low bulk density (0.5-0.7 g-cm3) and fair technical properties (loose weight and strength of particles). These encouraging results make some of the investigated tuffs interesting raw materials for the production of lightweight aggregates.

Item Type:Article
ID Code:2695
Status:Published
Refereed:Yes
Uncontrolled Keywords:Zeolites, lighweight aggregates, chabazite, clinoptilolite, phillipsite
Subjects:Area 04 - Scienze della terra > GEO/09 Georisorse minerarie e applicazioni mineralogico- petrografiche per l'ambiente ed i beni culturali
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Trans Tech Publications
ISSN:1013-9826
Additional Information:Paper presented at: Euro Ceramics VIII: 8th Conference and Exhibition of the European Ceramic Society, Istanbul, Turkey, June 29-July 3, 2003.
Deposited On:18 Aug 2009 10:08

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page