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Title: New data on the thermal behavior of 14 Å tobermorite

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 d{sub 002} 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.
Authors:
 [1] ;  [1] ;  [1] ;  [2]
  1. Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, I-56126 Pisa (Italy)
  2. Dipartimento di Fisica, Università di Parma, Viale G.P. Usberti 7/a, I-43100 Parma (Italy)
Publication Date:
OSTI Identifier:
22220802
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 49; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHAINS; CRYSTAL STRUCTURE; DEHYDRATION; EUROPEAN SYNCHROTRON RADIATION FACILITY; HEAT TREATMENTS; HEATING; PERIODICITY; RAMAN SPECTRA; SPECTROSCOPY; X-RAY DIFFRACTION