Belay Zeleke Dilnesa - Eawag-Empa Library

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CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES Fig. 30 Thermal analysis (TGA and DTG) of Al and Fe-monosulfate after 680 days. 3.2.6. Solid solution between Al and Fe-monosulfate (C4(A,F)sH12) The similarity in the ionic radii of Al 3+ and Fe 3+ and the structure of Al- and Fe- monosulfate could allow Al-Fe substitutions in the structure and the formation of a solid solution. Solid solution formation can stabilize the solids by decreasing their solubility. Möschner et al. [16] observed the formation of a solid solution between Al- and Fe- ettringite with a miscibility gap. In contrast, no solid solution was found between Al- and Fe-monocarbonate due to the different symmetries of Al-monocarbonate (triclinic) and Fe-monocarbonate (rhombohedral) [19]. In this study, mixed 3CaO(AlxFe1-x)2O3(CaSO4)12H2O were synthesized at room temperature by varying the Al/(Al + Fe) ratio from 0 to 1. Fig. 31 shows the XRD pattern of the 3CaO(AlxFe1-x)2O3(CaSO4)12H2O series. 77
CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES A peak shift from 0.0 to 0.45 Al/(Al + Fe) ratio was clearly observed caused by the substitution of Al 3+ by Fe 3+ in the main layer structure of monosulfate for the 104 peak at 2θ = 22°. A peak splitting was observed between 0.45 and 0.95 Al/(Al + Fe) ratio. This indicated a mixture of two monosulfate instead of one solid solution containing Al and Fe. This suggested a miscibility gap in the solid solution series exists in the range 0.45
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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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Page 80 and 81: o layer thickness (A) 8.0 7.8 7.6 C
Page 86 and 87: Phase log KSo CHAPTER 3 SYNTHETIC F
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CHAPTER 3 SYNTHETIC FE-CONTAINING H
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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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