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Phase log KSo CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES Table 13 Thermodynamic parameters of carbonate containing AFm phases at standard conditions (25°C, 1 atm). fG° [kJ/mol] fH° [kJ/mol] S 0 [J/K/mol] C 0 p [J/mol/K] a0 [J/(mol.K)] a1 [J/(mol.K 2 )] a2 [JK/mol] a3 [J/(mol.K 0.5 )] V 0 [cm 3 /mol] Ref. C4FcH12 -34.59±0.5 -6674.0 -7485 1230 950 612 1.160 -5.73e+05 0 292 a C4Fc0.5H10 -30.83±0.5 -5952.9 -6581 1270 841 308 1.200 -9.08e+05 3200 273 a C4AcH11 -31.47±0.5 -7337.5 -8250 657 881 618 0.982 -2.59e+06 0 262 b, c C4Ac0.5H12 -29.13±0.5 -7336.0 -8270 713 906 664 1.014 -1.30e+06 -800 285 b, c (a) This study, (b) Lothenbach et al. [3], (c) Matschei et al. [52]. 3.1.5.3. Modeling of mixed CaO(AlxFe1-x)2O3CaCO3nH2O systems Table 12 shows the composition of the liquid phase with varying Al mole fraction. The concentrations of all species (Ca, Al, Fe, K) between 0.1 and 0.9 mole fraction of Al in the 3CaO(AlxFe1-x)2O3.CaCO3.nH2O system were found to be similar within the uncertainty range, indicating the presence of two separate solid phases (Table 12). Fig. 21 shows that the calculated and measured concentrations are comparable on the assumption that two separate phases are present. This supports the findings from XRD, which showed no solid solution between the Al- and Fe-Mc end members. Note that the presence of a solid solution would be indicated by gradual changes in the elemental concentrations (see dotted line in Fig. 21). 61
log c(Ca, Al, Fe, K, OH) in mmol/L 3 1 -1 -3 CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES -5 0 0.2 0.4 0.6 0.8 1 C4FcH11 Al/(Al+Fe) ratio C4AcH12 Fig. 21 Measured (symbols) and calculated (lines) concentrations in the liquid phases of the Ca Al Fe K OH- synthesized monocarbonate at different Al/Al+Fe ratios. 3.1.6. Modeling of C3A-C2F-CaCO3-CaSO4-H2O system in cement hydration Thermodynamic modeling was used to calculate the changes of the hydrate assemblage in the system C3A-C2F-CaCO3-CaSO4-H2O (SO3/(Al,Fe)2O3 = 1) in the absence and presence of CaCO3 using the thermodynamic data given in Table 5 with the aim of assessing differences in the properties of Fe-and Al-analogues and the effect of calcite. In the model calculations a fixed SO3/(Al,Fe)2O3 ratio of 1 was used while the calcite content (CO2/(Al,Fe)2O3 ratio) varied. A constant amount of solids (Al2O3 + Fe2O3 + CaSO4 + CaO + CaCO3) was maintained. 62
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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 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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