Belay Zeleke Dilnesa - Eawag-Empa Library

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konnten die Fe-haltigen Hydrate im Zementstein identifiziert und deren Anteile quantifiziert werden. Die Resultate zeigen, dass bereits nach einem Tag Hydratisierung des Zements mehrere Fe Spezies zum EXAFS Spektrum von Zementstein, das an der Fe K-Kante bestimmt wurde, beitragen. Während Ferrit die dominierende Fe Spezies im unhydratisierten Zement ist, erfolgte bereits kurz nach Beginn des Hydratisierungsprozesses die Bildung von Fe-Hydroxid. Mit der Zeit wurde die Bildung von stabilem Al/Fe-Si-Hydrogranat beobachtet, während die Anteile von Ferrit und Fe- Hydroxid langsam abnahmen. Diese Beobachtungen stehen im Einklang mit der thermodynamischen Modellierung, welche die Bildung von stabilem Al/Fe-Si- Hydrogranat in Zementstein voraussagt. Die Bestimmung der Löslichkeitsprodukte der einzelnen Hydratphasen ermöglicht es die bestehende, thermodynamische Datenbasis für Zementmineralien zu erweitern und eine quantitative Beurteilung, ob und in welchem Ausmass Fe-haltige Hydrate in frischen und gealterten Zementsystemen stabil sind, vorzunehmen. Die Resultate aus dieser Studie zur Speziation von Fe in Zement sind für ein besseres Verständnis der Wechselwirkung von Wasser und Zement wichtig und damit für die Beurteilung der Dauerhaftigkeit von zementartigen Materialien von grosser Bedeutung. Stichworte: Eisenhaltige Hydratphasen, Löslichkeitsprodukt, Feste Lösungen, Krystallstruktur; thermodynamische Modellierung; thermodynamische Daten vi
ACKNOWLEDGEMENT First I would like to thank Swiss National Foundation (SNF) for financial assistance during my study. I owe my deepest gratitude to my thesis supervisor and director Dr. Barbara Lothenbach, EMPA for excellent supervision. The thesis would not have been possible without the assistance and guidance of her. I will never find words to thank her for sharing her time. All you have done for me as a supervisor and as a friend are unforgettable. I would like to express my sincere acknowledgement to my thesis director Prof. Karen Scrivener for all the supervision, supports and valuable discussion throughout my thesis. It has been a great pleasure to be a member of her team and work together with her. It is with immense gratitude that I acknowledge my co-supervisor Dr. Erich Wieland, PSI Switzerland for teaching and guiding me during my study in particular on EXAFS techniques. He has made available his support all the time. It gives me great pleasure in acknowledging the support and help of Dr. Guillaume Renaudin and Dr. Adel Mesbah for synchrotron X-ray diffraction and Raman measurements and data analysis. I would like to thank many people who have helped me through the completion of this dissertation: Dr. Rainer Daehn for his assistance on XAS, Dr. Adrian Wichser for ICP measurement, Dr. Gwenn La Saout for Rietveld refinement, Dr. Mohsen Ben haha and Florian Deschner for assisting me on the SEM measurement, Dr. Frank Winnefeld for all the valuable discussions. Dr.Göril Möschner preparation for old samples and Dr. Konstantin Rozov for Fe-hydrotalcite sample. vii
Page 1: Fe-containing hydrates and their fa
Page 4 and 5: The measured composition of the liq
Page 6 and 7: ZUSAMMENFASSUNG Thermodynamische Mo
Page 10 and 11: I owe to thank all the laboratory t
Page 12 and 13: Table 19 Compositions of Al/Fe-mono
Page 14 and 15: LIST OF FIGURES Fig. 1 Calculated v
Page 16 and 17: Fig. 34 Calculated solubility produ
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Page 20 and 21: Table of Contents TABLE OF CONTENTS
Page 22 and 23: TABLE OF CONTENTS 3. SYNTHETIC FE
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Page 40 and 41: 3CaOAl2O3 + 6H2O → 3CaOAl2O36H2O
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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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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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