1,720,963 research outputs found
CARATTERIZZAZIONE PETROCHIMICA E PETROFISICA DI MATERIALI INERTI SECONDARI DA COSTRUZIONE E DEMOLIZIONE, PER LA REALIZZAZIONE DI IMPASTI CERAMICI ORDINARI E CALCESTRUZZI
No full textCaratterizzazione minerologica-petrografica I caso studio dell’impianto Fenza Daniela di Rovigo.
No full textIn questo lavoro, differenti frazioni granulometriche, ottenute da una selezione “on-site” da un impianto di lavorazione di Rovigo (NE Italy), sono state caratterizzate mediante fluorescenza di Raggi X e diffrattometria di Raggi X. Questo al fine di migliorare le metodologie di riciclaggio già presenti ed utilizzate per questi materiali.I risultati emersi da questo studio hanno evidenziato che attraverso un opportuno trattamento di frantumazione e selezione è possibile ottenere frazioni granulometriche composizionalmente omogenee. Sono state in particolare investigate le frazioni più fini ed è emerso che, oltre all’uso di questi materiali nella produzione di malte idrauliche (nel caso in cui la frazione allumo-silicatica sia elevata nella produzione di materiali a caratteristiche pozzolaniche), si potrebbe pensare di utilizzare le frazioni fini provenienti dal trattamento di C&D anche nella produzione di cementi e di prodotti ceramici
Chemical-mineralogical characterisation of construction and demolition waste: the case study of Fenza Daniela plant.
No full textChemical-mineralogical characterisation of construction and demolition waste and hypothesis for their reuse
No full textBuilding activity is currently demanding noticeable amounts of natural inert materials, such as gravel and sand, usually provided by natural sediments. The extraction of sediments can modify river-profiles and their equilibrium as well as quarrying activities could induce environmental problems.
The use of recycled aggregates is promoted by the EU which has provided guidelines for common strategies for a correct re-use of construction and demolition (C&D as proposed by Poon et al., 2001) (DG ENV. E. 3, 2000). As for the Italian situation, currently the legislation (D.L. 152/06) is encouraging the re-use of C&D inert materials but the re-utilisation of these materials is hampered by the scarcity of suitable plants for processing, as a result this resource is used as a lower quality materials for low grade application (i.e. road sub-base).
In this study, different grain-size fractions, obtained by a grain-size sorting, from a C&D processing plant in Rovigo (NE Italy), were investigated through X-ray fluorescence (XRF) and X-ray diffractometry (XRD) analyses, in order to evaluate their chemical and mineralogical composition, assisting in the development of improved recycling methodologies. The results indicate that, through an opportune crushing and sorting operation for C&D material, it is possible to obtain grain-size fractions with roughly homogenous chemical and mineralogical composition on each fraction. The homogeneity of the materials can be considerably improved if a careful differentiation takes place during the initial stages of C&D production (Poon, 1997; Poon et al. 2001). The finer fractions could be used for hydraulic mortar preparation only if the fraction of bricks, tiles and terracotta is prevalent, providing material with pozzolanic attitude (Baronio et al., 1997; Corinaldesi et al., 2002; Zendri et al., 2004). These fine recycled fractions were used in high grade application as starting materials for ceramics, requiring industrial treatment such as sintering process, Preliminary results have shown that there is a real possibility to use this materials for preparing suitable ceramic mixing. Next step testing will be testing for using the coarse fractions as aggregates for preparing concrete
Caratterizzazione mineralogico-petrografica di materiali inerti da costruzione e demolizione per il riciclaggio: caso studio l’impianto Fenza Daniela di Rovigo.
No full textIn questo lavoro, differenti frazioni granulometriche, ottenute da una selezione “on-site” da un impianto di lavorazione di Rovigo (NE Italy), sono state caratterizzate mediante fluorescenza di Raggi X e diffrattometria di Raggi X. Questo al fine di migliorare le metodologie di riciclaggio già presenti ed utilizzate per questi materiali.I risultati emersi da questo studio hanno evidenziato che attraverso un opportuno trattamento di frantumazione e selezione è possibile ottenere frazioni granulometriche composizionalmente omogenee. Sono state in particolare investigate le frazioni più fini ed è emerso che, oltre all’uso di questi materiali nella produzione di malte idrauliche (nel caso in cui la frazione allumo-silicatica sia elevata nella produzione di materiali a caratteristiche pozzolaniche), si potrebbe pensare di utilizzare le frazioni fini provenienti dal trattamento di C&D anche nella produzione di cementi e di prodotti ceramici
Petrochemical and petrophysical characterization of construction and demolition residues for the preparation of clay bricks
No full textSessione disciplinare GEO/09: Georisorse minerarie e applicazioni mineralogico-petrografiche per l’Ambiente ed i Beni Cultural
Construction and demolition inert materials: petrochemical and petrophysical characterisation for concrete preparation
No full textConstruction and demolition inert materials: chemical-mineralogical characterization and hypothesis for their reuse.
No full textBuilding activity is currently demanding noticeable amounts of natural inert
materials, such as gravel and sand, usually provided by natural sediments. The
extraction of sediments from rivers, for example, modifies river-profiles and
their equilibrium as well as quarrying activities from paleo-river deposits could
induce environmental problems, as the modification of hydrological and
hydrogeological framework of the interested area. Moreover quarrying inert
materials from rocky formations in hilly/mountainous areas is perceived as
dangerous for the environment, as it alters the landscape and potentially
triggers stability problems.
The use of recycled aggregates is promoted by the EU which, in the framework
of an environmental protection and waste management policy, has provided
guidelines for common strategies for a correct re-use of construction and
demolition (C&D as proposed by Poon et al., 2001) (DG ENV. E. 3, 2000). With
the introduction of a specific waste legislation, with regulations and directives,
in many parts of world, a significant move towards the sustainable
management of C&D inert materials is becoming a legal requirement. In
response, different sectors of the construction industry are undertaking various
initiatives to minimise waste generation and improve the management of C&D
waste to maximise economic and environmental benefits, generally by placing
emphasis on increasing recycling for reuse.
As for the Italian situation, currently the legislation (D.L. 152/06) is
encouraging the re-use of C&D inert materials but the re-utilisation of these
materials is hampered by the scarcity of suitable plants for processing, as a
result this resource is used as a lower quality materials for low grade
application (i.e. road sub-base). In this study, different grain-size fractions,
obtained by a grain-size sorting, from a C&D processing plant in Rovigo (NE
Italy), were investigated through X-ray fluorescence (XRF) and X-ray
diffractometry (XRD) analyses, in order to evaluate their chemical and
mineralogical composition, assisting in the development of improved recycling
methodologies. This study indicates that, through an opportune crushing and
sorting operation for C&D material, it is possible to obtain grain-size fractions
with roughly homogenous chemical and mineralogical composition on each
fraction. The homogeneity of the materials can be considerably improved if a
careful differentiation takes place during the initial stages of C&D production
(Poon, 1997; Poon et al. 2001). The finer fractions could be used for hydraulic
mortar preparation only if the fraction of bricks, tiles and terracotta is
prevalent, providing material with pozzolanic attitude (Baronio et al., 1997;
Corinaldesi et al., 2002; Zendri et al., 2004). These fine recycled fractions
could also be used in high grade application (i.e. starting materials for
ceramics) requiring an industrial treatment (e.g., sintering process). Similarly,
it could be also possible to reuse them in cement preparation, after suitable mixing with lime and subsequent calcination process.
References:
-Baronio, G., Binda, L., Bombardini, N., 1997. Construction and Building Materials 11, 33-40.
-Corinaldesi, V., Giuggioloni, M., Moriconi, G., 2002. Waste management 22, 893-899.
-D.L. 152/06-Decreto Legislativo 152/06: Norme in materia ambientale, parte IV.
-European Commission, Directorate - General Environment, DG ENV. E.3, 2000. Management of construction and demolition waste. Working document No. 1, pp. 1-26.
-Poon, C.S., 1997. Waste Management and Research 15, 561-572.
-Poon, C.S., Yu, A.T.W., Ng, L.H., 2001. Conservation and Recycling 32, 157-172.
-Zendri, E., Lucchini, V., Biscontin, G., Morabito, M., 2004. Applied Clay Science 25, 1-7
Caratterizzazione petrochimica e petrofisica di materiali inerti da costruzione e demolizione, per la preparazione di impasti ceramici
No full textFine recycled fractions were used in high grade application as starting materials for ceramic mixes prepared and tested in collaboration with CNR-IRTEC Faenza laboratories. Preliminary results, in fact had shown that there is a real possibility to use this materials for preparing suitable ceramic mixing.
Fine recycled fractions (TA1d e TA2d sands) were used for preparing 6 different mixes (two recycled sands plus two different kind of clay) compared with 3 mixes prepared using natural sand (Colombara) plus the same clays. Clays used (Sila, Mosso, Giomo) were selected on geographical basis, quarried not far from the Fenza Daniela plant.
Were produced:
- 3 standard mixes (Colombara plus Sila, Mosso, Giomo respectively)
- 3 mixes (TA1 plus Sila, Mosso, Giomo respectively)
- 3 mixes (TA2 plus Sila, Mosso, Giomo respectively)
All the materials used were characterized in the CNR-IRTEC of Faenza laboratories and then were also characterized all the mixes produced.
The results have shown that using the recycled sands, produced for these experimental study, it is possible to prepare ceramics mixes for bricks with the very similar characteristic when compared with mixes produced with natural materials
Petrochemical and petrophysical characterisation of construction and demolition inert materials for concrete.
No full textUse of recycled aggregates is promoted by EU with guidelines for common strategies for a correct re-use of construction and demolition (C&D) [Poon et al., 2001]. In Italy, the legislation is encouraging the re-use of C&D inert materials but, due to the scarcity of suitable plants for processing, this resource is used as a lower quality materials for low grade application. In this study, different grain-size fractions, obtained by a grain-size sorting, from a C&D processing plant in Rovigo (NE Italy), were investigated through chemical and physical testing, to evaluate their composition, assisting in the development of improved recycling methodologies for concrete. Chemical-mineralogical and physical analysis have shown that the material is roughly homogenous. Several concrete mixes were prepared using different percentage of recycled aggregate and tested. The data have shown that the introduction of 30% of inert recycled coarse fraction, substituting natural coarse aggregate, does not affect the concrete
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