The thermal behavior of two specimens of 14 Å tobermorite (plombièrite) was studied in situ at the GILDA beamline (ESRF, Grenoble, France). During dehydration, plombièrite shortens its basal spacing from 14 to 11 Å, through a progressive approaching of the complex structural modules characterizing its crystal structure. Upon heating, the 11 Å phase progressively contracts its c periodicity, with its d002 varying from 11.7 to 11.3 Å. At ca. 300 °C, a 9.6 Å phase appears; it is stable up to ca. 700 °C. Above this temperature, it expands its basal spacing up to 10.2 Å, before transforming into wollastonite. Moreover, one specimen was heated at 150 °C for 4 h and the heated product, identified as 11 Å tobermorite through X-ray powder diffraction, was used to collect micro-Raman spectra. The heated product shows single chains, in contrast with the 11 Å natural specimens studied up to now in which double wollastonite-like chains occur.

New data on the thermal behavior of 14? tobermorite / Cristian, Biagioni; Elena, Bonaccorsi; Stefano, Merlino; Bersani, Danilo. - In: CEMENT AND CONCRETE RESEARCH. - ISSN 0008-8846. - 49:(2013), pp. 48-54. [10.1016/j.cemconres.2013.03.007]

New data on the thermal behavior of 14? tobermorite

BERSANI, Danilo
2013-01-01

Abstract

The thermal behavior of two specimens of 14 Å tobermorite (plombièrite) was studied in situ at the GILDA beamline (ESRF, Grenoble, France). During dehydration, plombièrite shortens its basal spacing from 14 to 11 Å, through a progressive approaching of the complex structural modules characterizing its crystal structure. Upon heating, the 11 Å phase progressively contracts its c periodicity, with its d002 varying from 11.7 to 11.3 Å. At ca. 300 °C, a 9.6 Å phase appears; it is stable up to ca. 700 °C. Above this temperature, it expands its basal spacing up to 10.2 Å, before transforming into wollastonite. Moreover, one specimen was heated at 150 °C for 4 h and the heated product, identified as 11 Å tobermorite through X-ray powder diffraction, was used to collect micro-Raman spectra. The heated product shows single chains, in contrast with the 11 Å natural specimens studied up to now in which double wollastonite-like chains occur.
2013
New data on the thermal behavior of 14? tobermorite / Cristian, Biagioni; Elena, Bonaccorsi; Stefano, Merlino; Bersani, Danilo. - In: CEMENT AND CONCRETE RESEARCH. - ISSN 0008-8846. - 49:(2013), pp. 48-54. [10.1016/j.cemconres.2013.03.007]
File in questo prodotto:
File Dimensione Formato  
New data on the thermal behavior of 14 Å tobermorite.pdf

non disponibili

Tipologia: Documento in Post-print
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 1.05 MB
Formato Adobe PDF
1.05 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2698084
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 24
social impact