Belay Zeleke Dilnesa - Eawag-Empa Library

CHAPTER 4 FE-CONTAINING HYDRATES IN HYDRATED CEMENT
features are nearly similar between 1 day and 1 year. The changes in the spectral features
reveal the formation of new Fe-containing hydrates which contributed the composed
spectra. This shows that the coordination environment of iron changes during the
hydration process.
k 3 (k)
100
80
60
40
20
0
2 4 6 8 10
k( Å -1
)
1 years
150 days
28 days
1 day
16 hrs
8 hrs
4 hrs
Unhy
Fig. 78 EXAFS spectra of hydrated OPC at 20 °C and at different ages (line: experimental data;
dots: modeled data). The broken lines outline selected spectral features.
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