Belay Zeleke Dilnesa - Eawag-Empa Library

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weight loss in % differentiated relative weight 100 90 80 70 -0.1 Fe-Ett C-S-H -0.2 -0.3 CHAPTER 4 FE-CONTAINING HYDRATES IN HYDRATED CEMENT AFm CsH 2 CH 100 200 300 400 500 600 700 800 Temperature (°C) C2F + Cc7 C2F + Cc + Gyp 7.8% Cc + 0% Gyp 7.4% Cc + 6% Gyp 6.2% Cc + 20% Gyp Fig. 88 XRD (above) and TGA-DTG (below) analysis of synthetic Fe-cement after 3 months of hydration with different amounts of gypsum and calcite Thermodynamic calculations The thermodynamic calculations for the synthetic Fe-cements predicted the formation of Fe-siliceous hydrogarnet instead of monocarbonate (Fig. 89). In the presence of more calcium sulfate, again Fe-ettringite was calculated to be stabilized as calculated also for the calcite free synthetic Fe-cements as discussed above. Cc 179
cm 3 /100g CHAPTER 4 FE-CONTAINING HYDRATES IN HYDRATED CEMENT 70 60 50 40 30 20 10 Fe-Si-hydrogarnet portlandite Fe-ettringite C-S-H calcite 0 0 10 20 30 40 Gypsum % 50 60 Fig. 89 Calculated phase diagram of thermodynamic stable hydrate assemblages of Fe-synthetic cement with different amounts of gypsum and calcite. 4.2.4. Conclusions The experimental study show that pure ferrite phase (C2F) reacted fast and formed Fe- containing OH-AFm phases. If the samples carbonate the formation of monocarbonate was observed. The presence of gypsum strongly retarded the ferrite reaction and led to the formation of Fe-ettringite. The hydration of synthetic Fe-cement resulted in the formation of C-S-H, portlandite and possibly Fe-siliceous hydrogarnet. In the presence of gypsum Fe-ettringite was also formed, both in the absence and presence of calcite. Thermodynamic modeling was in agreement with the experimental observations and predicted the formation of C-S-H, portlandite and Fe-siliceous hydrogarnet at lower gypsum content. Upon the addition of Gypsum gypsum stable Fe-ettringite was predicted, again in the absence and presence of calcite. 180
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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 154 and 155: 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 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
Page 230 and 231: REFRENCES [107] K. Kyritsis, N. Mel
Page 232 and 233: REFRENCES [134] M. Wilke, F. Farges
Page 235 and 236: CURRCULUM VITAE Curriculum Vitae Na
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