Belay Zeleke Dilnesa - Eawag-Empa Library

More documents

Recommendations

Info

CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES Based on the measured compositions of the liquid phase (as given in Table 26), the solubility products at 20, 50 and 80 °C were calculated according to: KS0 (C3AH6) = {Ca 2+ } 3 . {AlO2 - } 2 . {OH - } 4 . {H2O} 4 The values estimated for different equilibration times are given in Table 26 and shown in Fig. 50. The calculated solubility products are comparable with previously published data within the experimental error [7, 111, 112, 115]. The temperature dependent solubility product of C3AH6 was determined based on the solubility measured at 20, 50 and 80 °C in this study and from solubilities reported in the literature. The entropy was visually fitted until a good agreement between measured and calculated data was achieved (Fig. 50). logKs0 -20 -20.5 -21 -21.5 -22 -22.5 -23 -23.5 -24 0 20 40 60 80 100 120 Temperature (°C) Matschei et al 2007 Atkins et al 1991 Bennet et al 1992 Peppler et al 1954 this study Lothenbach et al 2011 Roberts et al 1969 Calculated Carlson et al. 1968 Wells et al. 1943 Fig. 50 Solubility products of C3AH6 calculated from the solubility experiments carried out in this study and from different published data [7, 111, 112, 114-116]. 115
CHAPTER 3 SYNTHETIC FE-CONTAINING HYDRATES The data of Carlson et al. [114] and Wells at el. [116] obtained at 1 and 21 °C were not considered as they deviate strongly from the other published data. The co-precipitation of C4AH13 with the target phase in all equilibration experiment enabled us to estimate the ion activity products of the OH-AFm based on the following equation: KS0 (C4AH13) = {Ca 2+ } 4 . {AlO2 - } 2 . {OH - } 6 . {H2O} 10 The calculated data are given in Table 26. The ion activity products were determined to be -26.02 and -26.45 at 20 °C and 50 °C, respectively. These values are slightly lower than the value of -25.53 (20 °C) and -25.06 (50 °C) derived elsewhere [3]. The solubility at 50 °C is difficult to measure as the C4AH13 transformed relatively fast to C3AH6 or monocarbonate and thus the system possibly was undersaturated at the time of sampling. The standard molar thermodynamic properties of C3AH6 determined in this study are summarized in Table 27. Table 27 Thermodynamic parameters at standard conditions determined in this study (25°C, 1 atm). Phases log KS0 fG° [kJ/mol] fH° [kJ/mol] S 0 [J/mol/K] C 0 p [J/mol/K] a0 [J/(mol.K)] a1 [J(/mol.K 2 )] a2 [JK /mol] a3 [J/(mol.K 0.5 )] C3AH6 -20.56 -5008.8 -5535 432 459 292 0.5610 150 116 V 0 [cm 3 /mol] C4FH13 -30.64 -6438.0 -7431 640 956 694 1.1134 2.02E+06 -1600 286 C3FS0.95H4.1 -32.75 -4523.5 -4854 855 612 582 0.6094 2.19E+06 -3040 156 C3FS1.52H2.96 -34.68 -4752.8 -5044 847 688 766 0.5988 2.29E+06 -4864 161 C3AS0.41H5.18 -25.47 -5193.5 -5717 342 441 198 0.5967 -9.98E+05 1312 151 C3AS0.84H4.32 -26.70 -5365.2 -5867 310 421 100 0.6342 -2.05E+06 2688 142
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 8 and 9:
konnten die Fe-haltigen Hydrate im
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
Page 18 and 19:
Fig. 62 Calculated solubility produ
Page 20 and 21:
Table of Contents TABLE OF CONTENTS
Page 22 and 23:
TABLE OF CONTENTS 3. SYNTHETIC FE
Page 24 and 25:
TABLE OF CONTENTS 3.5.4. Solid solu
Page 26 and 27:
1 INTRODUCTION CHAPTER 1 INTRODUCTI
Page 28 and 29:
CHAPTER 1 INTRODUCTION be formed. T
Page 30 and 31:
cm 3 /100 g cement 85 80 75 70 65 6
Page 32 and 33:
CHAPTER 1 INTRODUCTION 1.4 Characte
Page 34 and 35:
CHAPTER 1 INTRODUCTION Fig. 4 Sampl
Page 36 and 37:
CHAPTER 1 INTRODUCTION Identificat
Page 38 and 39:
CHAPTER 2 MATERIALS AND METHODS han
Page 40 and 41:
3CaOAl2O3 + 6H2O → 3CaOAl2O36H2O
Page 42 and 43:
CHAPTER 2 MATERIALS AND METHODS Tab
Page 44 and 45:
CHAPTER 2 MATERIALS AND METHODS 2.2
Page 46 and 47:
CHAPTER 2 MATERIALS AND METHODS fil
Page 48 and 49:
CHAPTER 2 MATERIALS AND METHODS at
Page 50 and 51:
CHAPTER 2 MATERIALS AND METHODS the
Page 52 and 53:
CHAPTER 2 MATERIALS AND METHODS 0 t
Page 54 and 55:
CHAPTER 2 MATERIALS AND METHODS Tab
Page 56 and 57:
CHAPTER 2 MATERIALS AND METHODS 2.3
Page 58 and 59:
CHAPTER 2 MATERIALS AND METHODS The
Page 60 and 61:
CHAPTER 3 SYNTHETIC FE-CONTAINING H
Page 62 and 63:
Page 64 and 65:
Page 66 and 67:
Page 68 and 69:
Page 70 and 71:
Page 72 and 73:
Page 74 and 75:
a). b). CHAPTER 3 SYNTHETIC FE-CONT
Page 76 and 77:
Page 78 and 79:
Page 80 and 81:
o layer thickness (A) 8.0 7.8 7.6 C
Page 82 and 83:
Page 84 and 85:
Page 86 and 87:
Phase log KSo CHAPTER 3 SYNTHETIC F
Page 88 and 89:
volume [cm 3 ] 700 600 500 400 300
Page 90 and 91: CHAPTER 3 SYNTHETIC FE-CONTAINING H
Page 118 and 119: Intensity [arb. units] Fe-Fr CHAPTE
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 190 and 191:
CHAPTER 4 FE-CONTAINING HYDRATES IN
Page 192 and 193:
Page 194 and 195:
Page 196 and 197:
Page 198 and 199:
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 206 and 207:
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
show all

Belay Zeleke Dilnesa - Eawag-Empa Library

Create successful ePaper yourself

Delete template?

Save as template?