Belay Zeleke Dilnesa - Eawag-Empa Library

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CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES 3000 cm -1 to 4000 cm -1 with sharp signals. In contrast, the O–H bands of vibrations in the structure of Al-Friedel’s salt are characterized by a broad signal [78]. Fig. 42 Raman spectra recorded for Fe-Friedel’s salt crystal. 3.3.5. Solid solution between Al and Fe-Friedel’s salt (3CaO(AlxFe1- x)2CaCl2.10H2O Kuzel et al. [88] observed only limited solid solution formation between Al- and Fe- Friedel’s salt at a temperature below 100 °C. In contrast, Goetz-Neunhoeffer et al. [97] and Rapin et al. [99] observed the existence of a continuous solid solution in Al/Fe- Friedel’s salt at room temperature (see Fig. 43). In this study, only a few samples with different Al/(Al + Fe) ratios were investigated. The samples were prepared from CaO and AlCl3.6H2O or FeCl3.6H2O in 0.1 M KOH. The results of this mixed Al/Fe-Friedel’s salt did not agree well with previously reported findings as shown in Fig. 43. Carbonation and the small number of samples made the results inconclusive. However, based on the study of Goetz-Neunhoeffer et al. [97] and Rapin et al. [99] a solid solution formation seems probable. 99
unit cell parameter a (Å) 6.0 5.9 5.8 5.7 CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES 0.0 0.2 0.4 0.6 0.8 1.0 Al/(Al+Fe) ratio Goetz-Neunhoeffer 1996 Rapin 2001 Kuzel 1968 Rousselot 2003 this study Fig. 43 Values of a-parameters for the Al/Fe-Friedel’ salt solid solution determined in this study compared to the findings by Kuzel et al. [88], Goetz Neunhoeffer et al. [100], Rapin et al. [99] and Rousselot et al. [96]. 3.3.6. Solubility The concentrations of the solutions were measured after different equilibration times for pure Fe-Friedel’s salt (Table 22 and Table 23) and for mixed Al/Fe-Friedel’s salts (Table 25). The measured ion concentrations were used for the calculation of the solubility products of Friedel’s salt. 3.3.6.1. Solubility of Fe-Friedel’s salt The Fe-Friedel’s salt prepared from FeCl3.6H2O and CaO in 0.1 M KOH did not contain portlandite as also indicated by the low portlandite ion activity product (-6), thus indicating effectively undersaturation. The concentrations of calcium, chloride and iron in the aqueous phase were relatively high compared to the other samples; while the 100
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Fe-containing hydrates and their fa
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The measured composition of the liq
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ZUSAMMENFASSUNG Thermodynamische Mo
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konnten die Fe-haltigen Hydrate im
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I owe to thank all the laboratory t
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Table 19 Compositions of Al/Fe-mono
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LIST OF FIGURES Fig. 1 Calculated v
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Fig. 34 Calculated solubility produ
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Fig. 62 Calculated solubility produ
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Table of Contents TABLE OF CONTENTS
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TABLE OF CONTENTS 3. SYNTHETIC FE
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TABLE OF CONTENTS 3.5.4. Solid solu
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1 INTRODUCTION CHAPTER 1 INTRODUCTI
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CHAPTER 1 INTRODUCTION be formed. T
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cm 3 /100 g cement 85 80 75 70 65 6
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CHAPTER 1 INTRODUCTION 1.4 Characte
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CHAPTER 1 INTRODUCTION Fig. 4 Sampl
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CHAPTER 1 INTRODUCTION Identificat
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CHAPTER 2 MATERIALS AND METHODS han
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3CaOAl2O3 + 6H2O → 3CaOAl2O36H2O
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CHAPTER 2 MATERIALS AND METHODS Tab
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CHAPTER 2 MATERIALS AND METHODS 2.2
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CHAPTER 2 MATERIALS AND METHODS fil
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CHAPTER 2 MATERIALS AND METHODS at
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CHAPTER 2 MATERIALS AND METHODS the
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CHAPTER 2 MATERIALS AND METHODS 0 t
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CHAPTER 2 MATERIALS AND METHODS Tab
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CHAPTER 2 MATERIALS AND METHODS 2.3
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CHAPTER 2 MATERIALS AND METHODS The
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CHAPTER 3 SYNTHETIC FE-CONTAINING H
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Page 80 and 81: o layer thickness (A) 8.0 7.8 7.6 C
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CHAPTER 4 FE-CONTAINING HYDRATES IN
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(Al+Fe)/Ca (Al+Fe)/Ca 0.8 0.6 0.4 0
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k 3 (k) CHAPTER 4 FE-CONTAINING HYD
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differentiated relative weight Weig
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Early reaction CHAPTER 4 FE-CONTAIN
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weight loss in % differentiated rel
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5. GENERAL CONCLUSION AND OUTLOOK a
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Speciation of iron(III) in hydrated
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5. GENERAL CONCLUSION AND OUTLOOK
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Techniques XRD X-ray diffraction TG
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APPENDIX APPENDIX Appendix A: Addit
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Intensity (arb. Units) P Fe 2O 3 R
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APPENDIX Appendix B7 XRD patterns o
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REFERENCES REFRENCES [1] H.F.W. Tay
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REFRENCES [29] M. Vespa, R. Dähn,
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REFRENCES [54] M. Balonis, B. Lothe
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REFRENCES [81] H.F.W. Taylor, Cryst
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REFRENCES [107] K. Kyritsis, N. Mel
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REFRENCES [134] M. Wilke, F. Farges
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CURRCULUM VITAE Curriculum Vitae Na
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