Belay Zeleke Dilnesa - Eawag-Empa Library

TABLE OF CONTENTS
3. SYNTHETIC FE‐CONTAINING HYDRATES ................................................................... 35
3.1. Iron containing carbonate AFm phases ............................................................ 35
3.1.1. Introduction .................................................................................................. 35
3.1.2. Fe‐hemicarbonate ......................................................................................... 37
3.1.3. Fe‐monocarbonate ....................................................................................... 40
3.1.3.1. Kinetics of formation ............................................................................ 40
3.1.3.2. Effect of temperature ........................................................................... 42
3.1.3.3. Structure of Fe‐Mc ................................................................................ 43
3.1.3.4. Comparison of pure Fe‐ and Al‐Mc ....................................................... 50
3.1.4. Mixed CaO.(AlxFe1‐x)2O3.CaCO3.nH2O systems .............................................. 53
3.1.5. Solubility ........................................................................................................ 55
3.1.5.1. Determination of solubility products at 20 °C and 50 °C ...................... 56
3.1.5.2. Estimation of the solubility product under standard conditions ......... 59
3.1.5.3. Modeling of mixed CaO(AlxFe1‐x)2O3CaCO3nH2O systems ................. 61
3.1.6. Modeling of C3A‐C2F‐CaCO3‐CaSO4‐H2O system in cement hydration ......... 62
3.1.7. Conclusions ................................................................................................... 64
3.2. Fe‐containing monosulfate ............................................................................... 67
3.2.1. Introduction .................................................................................................. 67
3.2.2. Kinetics of formation .................................................................................... 67
3.2.3. Effects of temperature .................................................................................. 69
3.2.4. Structure of C4FsH12 ...................................................................................... 70
3.2.5. Comparison of C4AsH12 with C4FsH12 ............................................................ 74
3.2.6. Solid solution between Al and Fe‐monosulfate (C4(A,F)sH12) ...................... 77
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