Belay Zeleke Dilnesa - Eawag-Empa Library

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CHAPTER 4 FE-CONTAINING HYDRATES IN HYDRATED CEMENT SEM/EDX studies were carried out to identify minor phases in the SAM treated OPC pastes and to determine the composition of siliceous hydrogarnet. Fig. 74a and b show the SEM images of SAM treated OPC samples hydrated for 2 years at 20 °C or 50 °C, respectively. Unreacted C2(A,F) (bright areas) was found to be covered partially by less dense siliceous hydrogarnet (light grey level). EDX was used to verify the presence of the latter phase. Fig. 75 shows the atomic ratios of (Al+Fe)/Ca against Si/Ca determined on the spots indicated in the SEM images. The composition of siliceous hydrogarnet was found to be Ca3Al0.9Fe1.0Si0.85O6 and Ca3Al1.1Fe0.95Si1.0O6.7 at 20 °C and 50 °C, respectively. The composition may vary due to the substitution of Al by Fe in hydrogarnet [129]. An important finding from this SEM/EDX study is that Fe tends to accumulate in the siliceous hydrogarnet together with Al, possibly indicating a solid solution. However, the presence of other Fe-containing phases (which might have dissolved during SAM extraction) in the hydrated cement cannot be excluded. 155
a). b). CHAPTER 4 FE-CONTAINING HYDRATES IN HYDRATED CEMENT Fig. 74 SEM/EDX of hydrated OPC for 2 years at (a) 20 °C and (b) 50 °C after selective dissolution with SAM. 156
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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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a). b). CHAPTER 3 SYNTHETIC FE-CONT
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o layer thickness (A) 8.0 7.8 7.6 C
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Phase log KSo CHAPTER 3 SYNTHETIC F
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volume [cm 3 ] 700 600 500 400 300
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Intensity [arb. units] Fe-Fr CHAPTE
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Page 130 and 131: CHAPTER 3 SYNTHETIC FE-CONTAINING H
Page 172 and 173: CHAPTER 4 FE-CONTAINING HYDRATES IN
Page 182 and 183: (Al+Fe)/Ca (Al+Fe)/Ca 0.8 0.6 0.4 0
Page 188 and 189: k 3 (k) CHAPTER 4 FE-CONTAINING HYD
Page 200 and 201: differentiated relative weight Weig
Page 202 and 203: Early reaction CHAPTER 4 FE-CONTAIN
Page 204 and 205: weight loss in % differentiated rel
Page 208 and 209: 5. GENERAL CONCLUSION AND OUTLOOK a
Page 210 and 211: Speciation of iron(III) in hydrated
Page 212 and 213: 5. GENERAL CONCLUSION AND OUTLOOK
Page 214 and 215: Techniques XRD X-ray diffraction TG
Page 216 and 217: APPENDIX APPENDIX Appendix A: Addit
Page 218 and 219: Intensity (arb. Units) P Fe 2O 3 R
Page 220 and 221: APPENDIX Appendix B7 XRD patterns o
Page 222 and 223: REFERENCES REFRENCES [1] H.F.W. Tay
Page 224 and 225: REFRENCES [29] M. Vespa, R. Dähn,
Page 226 and 227: REFRENCES [54] M. Balonis, B. Lothe
Page 228 and 229: 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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