Iron in carbonate containing AFm phases
Creators
- 1. Empa, Laboratory for Concrete and Construction Chemistry, Uberlandstrasse 129, CH-8600 Duebendorf (Switzerland)
- 2. CNRS, UMR 6002, LMI, F-63177 Aubiere (France)
- 3. Clermont Universite, ENSCCF, Laboratoire des Materiaux Inorganiques, BP 10448, F-63000 Clermont-Ferrand (France)
- 4. Swiss-Norwegian Beam Lines at ESRF, 6 rue Jules Horowitz, BP 220, 38043 Grenoble (France)
- 5. Paul Scherrer Institute, Nuclear Energy and Safety Research Department, Laboratory for Waste Management, 5232 Villigen PSI (Switzerland)
Description
One of the AFm phases in hydrated Portland cement is Ca3(AlxFe2-x)O6.CaCO3.nH2O. It is based on hexagonal and platey structural elements and the interlayer structure incorporates CO32-. The solid phases were experimentally synthesized and characterized by different techniques including X-ray techniques (XRD and EXAFS) and vibrational spectroscopy techniques (IR, Raman). Fe-monocarbonate (Fe-Mc) and Al-monocarbonate (Al-Mc) were found to be stable up to 50 oC, while Fe-hemicarbonate (Fe-Hc) was unstable with respect to Fe-Mc in the presence of calcite. Fe-Mc has a rhombohedral R3-barc symmetry which is different from the triclinic of the Al analogue. Both XRD and thermodynamic modelling of the liquid compositions indicated that Al-Mc and the Fe-Mc phases do not form solid solution. The solubility products were calculated experimentally at 20 oC and 50 oC. Under standards condition the solubility products and other thermodynamic parameters were estimated using temperature-solubility product extrapolation and found to be logKS0 (Fe-Mc) = -34.59 ± 0.50, logKS0 (Fe-Hc) = -30.83 ± 0.50 and logKS0(Al-Mc) = -31.32 ± 0.50.
Availability note (English)
Available from http://dx.doi.org/10.1016/j.cemconres.2010.11.017Additional details
Identifiers
- DOI
- 10.1016/j.cemconres.2010.11.017;
- PII
- S0008-8846(10)00260-7;
Publishing Information
- Journal Title
- Cement and Concrete Research
- Journal Volume
- 41
- Journal Issue
- 3
- Journal Page Range
- p. 311-323
- ISSN
- 0008-8846
- CODEN
- CCNRAI
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 42081261
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ABSORPTION SPECTROSCOPY; ALUMINIUM OXIDES; ATOMIC FORCE MICROSCOPY; CALCITE; CALCIUM CARBONATES; EXTRAPOLATION; FINE STRUCTURE; IRON; IRON OXIDES; LIQUIDS; PORTLAND CEMENT; SIMULATION; SOLID SOLUTIONS; SOLIDS; SOLUBILITY; TEMPERATURE RANGE 0273-0400 K; TRIGONAL LATTICES; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; BUILDING MATERIALS; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CEMENTS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; DISPERSIONS; ELEMENTS; FLUIDS; HOMOGENEOUS MIXTURES; IRON COMPOUNDS; MATERIALS; MATHEMATICAL SOLUTIONS; METALS; MICROSCOPY; MINERALS; MIXTURES; NUMERICAL SOLUTION; OXIDES; OXYGEN COMPOUNDS; SCATTERING; SOLUTIONS; SPECTROSCOPY; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS
Optional Information
- Copyright
- Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.