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Micro-Raman spectroscopy of thaumasite
Micro-Raman spectroscopy can be used to identify thaumasite. Three mineral samples were studied; in addition to the peaks at 658 and 990 cm-1 previously reported by Bensted and Varma(assigned to SiO6 and SO4 ny1 stretching, respectively), further peaks were found, which we assign to carbonate (1072 cm-1) and hydroxide/water (in the region of 3300 cm-1) species. Thaumasite lost no water at 100 degree C even after prolonged heating, however, most of the water was lost after heating at 110 degree C for 10 min. Simultaneously, the sharp peaks due to sulfate and carbonate groups (990 and 1072 cm-1) disappeared and were replaced by much broader peaks (1002 and 1082 cm-1). However, for the peak at 658 cm-1 attributed to silicate, there was no clear replacement. Further changes were evident in the vibrations of sulfate species. Thaumasite in veins was readily distinguished from ettringite in two specimens of field concrete, based on the combination of peaks at 658, 990, and 1072 cm-1, with spatial resolution of approximately 50 my m.
Micro-Raman spectroscopy of thaumasite
Micro-Raman spectroscopy can be used to identify thaumasite. Three mineral samples were studied; in addition to the peaks at 658 and 990 cm-1 previously reported by Bensted and Varma(assigned to SiO6 and SO4 ny1 stretching, respectively), further peaks were found, which we assign to carbonate (1072 cm-1) and hydroxide/water (in the region of 3300 cm-1) species. Thaumasite lost no water at 100 degree C even after prolonged heating, however, most of the water was lost after heating at 110 degree C for 10 min. Simultaneously, the sharp peaks due to sulfate and carbonate groups (990 and 1072 cm-1) disappeared and were replaced by much broader peaks (1002 and 1082 cm-1). However, for the peak at 658 cm-1 attributed to silicate, there was no clear replacement. Further changes were evident in the vibrations of sulfate species. Thaumasite in veins was readily distinguished from ettringite in two specimens of field concrete, based on the combination of peaks at 658, 990, and 1072 cm-1, with spatial resolution of approximately 50 my m.
Micro-Raman spectroscopy of thaumasite
Brough, A.R. (author) / Atkinson, A. (author)
Cement and Concrete Research ; 31 ; 421-424
2001
4 Seiten, 14 Quellen
Article (Journal)
English
Micro-Raman spectroscopy of thaumasite
| British Library Online Contents | 2001
Micro-Raman spectroscopy of thaumasite
| Online Contents | 2001
A discussion of the paper "Micro-Raman spectroscopy of thaumasite" by A.R. Brough and A. Atkinson
| British Library Online Contents | 2002
A discussion of the paper "Micro-Raman spectroscopy of thaumasite" by A.R. Brough and A. Atkinson
| Online Contents | 2002
Identification of thaumasite in concrete by Raman chemical imaging
| Online Contents | 2002