Ni phases formed in cement and cement systems under highly alkaline conditions: an XAFS study

Authors
Scheidegger, AM Wieland, E Scheinost, AC Dahn, R Tits, J Spieler, P
Citation
Am. Scheidegger et al., Ni phases formed in cement and cement systems under highly alkaline conditions: an XAFS study, J SYNCHROTR, 8, 2001, pp. 916-918
Citations number
27
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF SYNCHROTRON RADIATION
ISSN journal
09090495 → ACNP
Volume
8
Year of publication
2001
Part
2
Pages
916 - 918
Database
ISI
SICI code
0909-0495(200103)8:<916:NPFICA>2.0.ZU;2-4
Abstract
X-ray absorption fine structure (XAFS) spectroscopy was applied to assess t he solubility-limiting phase of Ni in cement and cement minerals. The study reveals the formation Ni and Al containing hydrotalcite-like layered doubl e hydroxides (Ni-Al LDHs) when cement material (a complex mixture of CaO, S iO2, Al2O3, Fe2O3 and SO3) was treated with Ni in artificial cement pore wa ter under highly alkaline conditions (pH = 13.3). This finding indicates th at Ni-Al LDHs and not Ni-hydroxides determine the solubility of Ni in cemen t materials.