Role of the morphology and the dehydroxylation of metakaolins on geopolymerization (Articolo in rivista)

Type
Label
  • Role of the morphology and the dehydroxylation of metakaolins on geopolymerization (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.clay.2010.10.010 (literal)
Alternative label
  • Valentina Medri; Samanta Fabbri; Jiri Dedecek; Zdenek Sobalik; Zdenka Tvaruzkova; Angelo Vaccari (2010)
    Role of the morphology and the dehydroxylation of metakaolins on geopolymerization
    in Applied clay science (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Valentina Medri; Samanta Fabbri; Jiri Dedecek; Zdenek Sobalik; Zdenka Tvaruzkova; Angelo Vaccari (literal)
Pagina inizio
  • 538 (literal)
Pagina fine
  • 545 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.sciencedirect.com/science/article/pii/S0169131710003248 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 50 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Applied Clay Science, vol. 50 pp. 538 - 545. Elsevier, 2010. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ISTEC-CNR, Via Granarolo 64, 48018 Faenza, Italy J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 2155/3, 18 223, Prague 8, Czech Republic Dipartimento di Chimica Industriale e dei Materiali, Alma Mater Studiorum, Università di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy (literal)
Titolo
  • Role of the morphology and the dehydroxylation of metakaolins on geopolymerization (literal)
Abstract
  • Two commercial metakaolins were tested during partial geopolymerization with potassium silicate in order to emphasize the different surface reactivities. Both manual and short-term mechanical stirring were used for slurry preparation, while radiation, infrared, and microwave heating were used for curing. The metakaolins had similar compositions and specific surface areas, but different morphologies and dehydroxylation degrees due to different calcination kiln technologies. The degree of geopolymerization was checked by SEM and N2 adsorption (BET), FTIR and 27Al MAS NMR spectroscopy. While the dehydroxylation degrees were different, the metakaolins had similar reactivity. The metakaolin powder with rounded agglomerates and lower water demand was more sensitive to the various geopolymerization conditions than the fine dispersed lamellar one, thus giving rise to very different micro- and macrostructures of the partially geopolymerized samples. IR heating seemed to increase the geopolymerization degree slightly, while MW heating induced the fast evaporation of the water, forming porous samples (literal)
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