@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS073 prodottidellaricerca:prodotto prodotto:ID222344 . @prefix pubblicazioni: . @prefix unitaDiPersonaleInterno: . unitaDiPersonaleInterno:MATRICOLA4877 pubblicazioni:autoreCNRDi prodotto:ID222344 . unitaDiPersonaleInterno:MATRICOLA8900 pubblicazioni:autoreCNRDi prodotto:ID222344 . unitaDiPersonaleInterno:MATRICOLA10409 pubblicazioni:autoreCNRDi prodotto:ID222344 . unitaDiPersonaleInterno:MATRICOLA7479 pubblicazioni:autoreCNRDi prodotto:ID222344 . @prefix modulo: . modulo:ID5831 prodottidellaricerca:prodotto prodotto:ID222344 . @prefix rdf: . prodotto:ID222344 rdf:type prodotto:TIPO1303 . @prefix retescientifica: . prodotto:ID222344 rdf:type retescientifica:ProdottoDellaRicerca . @prefix rdfs: . prodotto:ID222344 rdfs:label "Predicting the frost resistance of clay roofing tiles: a reappraisal of mercury intrusion porosimetry (Comunicazione a convegno)"@en . @prefix xsd: . prodotto:ID222344 pubblicazioni:anno "2005-01-01T00:00:00+01:00"^^xsd:gYear . @prefix skos: . prodotto:ID222344 skos:altLabel "
C. Ceroni, M. Dondi, G. Ercolani, G. Guarini, M. Raimondo, F. Sandrolini, I. Venturi, C. Zanelli (2005)
Predicting the frost resistance of clay roofing tiles: a reappraisal of mercury intrusion porosimetry
in 9th Conference of the European Ceramic Society, Portoroz, Slovenia, June 19-23, 2005
"^^rdf:HTML ; pubblicazioni:autori "C. Ceroni, M. Dondi, G. Ercolani, G. Guarini, M. Raimondo, F. Sandrolini, I. Venturi, C. Zanelli"^^xsd:string ; pubblicazioni:affiliazioni "CNR ISTEC\nDICASM, University of Bologna, Bologna (Italy)"^^xsd:string ; pubblicazioni:titolo "Predicting the frost resistance of clay roofing tiles: a reappraisal of mercury intrusion porosimetry"^^xsd:string ; prodottidellaricerca:abstract "The indirect prediction of frost resistance of bricks and tiles has been thoroughly investigated in the last decades, mainly on the basis of microstructural and physical features. This empirical approach gave rise to several models based on pore size, open porosity, water absorption and/or capillary rise. The present study is aimed at appraising these models on 13 industrially-manufactured roofing tiles with a different frost resistance determined by severe freeze/thaw testing (EN 539-2). Samples were characterised by measuring pore size distribution (MIP), pore specific surface (BET), open porosity and water absorption (ASTM C67 and C373), capillary rise (UNI 10859), microstructure (SEM) and phase composition (Rietveld-XRPD). No model is able to foresee reliably the frost resistance of roofing tiles, being the methods based exclusively on pore size (e.g. Maage durability index) somehow better, as water absorption and/or capillary rise data do not improve the prediction. All these empirical models exhibit a strong dependence on the data population and probably succeed only with a homogeneous sample in terms of both composition and manufacturing technology. Just the Maage's method is able to discriminate among scarcely (<100 freeze/thaw cycles) and highly frost resistant products (>400 cycles), though many roofing tiles with the same durability factor were found to withstand between 100 and 400 cycles. The tiles with a frost resistance higher than expected, on the basis of their pore size distribution, contain abundant calcium-magnesium silicate phases formed during firing (e.g. anorthite, diopside) while products with a frost resistance lower than expected are characterised by large amounts of amorphous phase or residual mica-illite and quartz. This circumstance indicates a new way to achieve highly frost resistant roofing tiles that is alternative to the conventional design imposing microstructural rearrangements (low porosity and coarse pore size) through drastic batch changes and/or firing at higher temperature."@en ; prodottidellaricerca:prodottoDi modulo:ID5831 , istituto:CDS073 ; pubblicazioni:autoreCNR unitaDiPersonaleInterno:MATRICOLA4877 , unitaDiPersonaleInterno:MATRICOLA10409 , unitaDiPersonaleInterno:MATRICOLA8900 , unitaDiPersonaleInterno:MATRICOLA7479 .