Belay Zeleke Dilnesa - Eawag-Empa Library

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5. GENERAL CONCLUSION AND OUTLOOK The conditions and kinetics of the formation of mixed hydrogarnets. The fate of iron under reducing conditions. Reducing conditions in cements may dominate in materials blended with blast furnace slags, upon the addition of chromate-reducing agents (often FeSO4 xH2O) or in the near field of a repository for radioactive waste where strongly reducing conditions are expected to prevail in the long term. Besides sulphur (and H2O and O2) Fe constitutes the most abundant redox couple (Fe(II)/Fe(III)) and thus plays a key role in controlling redox equilibria of cementitious systems. The effect of reducing conditions on the Fe speciation in cement is still poorly understood. The possible use of Mössbauer spectroscopy or other techniques complementary to the EXAFS technique. 187
ABBREVATIONS Cement chemistry notations ABBREVIATIONS C= CaO A=Al2O3 S = SiO2 s = SO3 c = CO2 F = Fe2O3 H = H2O Hydrated phases AFm Al2O3-Fe2O3-mono phase AFt Al2O3-Fe2O3-tri phase C-S-H Calcium silicate hydrate Portlandite=CH=P Gypsum=CsH2 Al-hemicarbonate=Al-Hc=C4Ac0.5H10 Al-monocarbonate=Al-Mc= C4AcH11 Fe-hemicarbonate=Fe-Hc=C4Fc0.5H10 Fe-monocarbonate=Fe-Mc= C4FcH12 Al-monosulfate =Al-Ms= C4AsH12 Fe-monosulfate=Fe-Ms= C4FsH12 Al-Friedel’s salt=Al-Fr Fe-Friedel’s salt=Fe-Fr Al-OH-AFm= C4AH13 Fe-OH-AFm= C4FH13 Al-katoite= C3AH6 Fe-katoite= C3FH6 Al-ettringite=Al-Ett= C4As3H32 Fe-ettringite=Fe-Ett= C4Fs3H32 Al-siliceous hydrogarnet= Al-Si-Hg (C4ASH4) Fe-Siliceous hydrogarnet= Fe-Si-Hg = (C4FSH4) OPC Ordinary Portland cement HS High sulfate resistant cement 188
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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 162 and 163: 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 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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