a thermodynamic approach to cement hydration - Eawag-Empa ...

Table A2.6.Calculated concentrations in the aqueous solution for the different ettringite
phases assuming a miscibility gap between XAl,total = 0.25-0.65 and the formation of calcite
and Fe-hydroxide. Presented in Fig. 3.7A.
132
XAl,total Ca [mmol/L] S [mmol/L] Al [mmol/L] Fe [µmol/L] OH - [mmol]
0.00 5.17 14.74 - 0.33 13
0.10 4.71 13.77 - 0.35 14
0.20 4.38 12.96 - 0.38 14
0.30 4.00 11.74 - 0.42 16
0.40 3.82 11.02 - 0.44 17
0.50 3.63 10.17 - 0.48 18
0.60 3.52 9.64 - 0.50 19
0.70 3.36 8.90 - 0.52 20
0.80 3.06 7.83 - 0.56 22
0.90 2.53 6.75 - 0.59 23
0.92 2.34 6.37 - 0.60
0.95 1.91 5.89 0.01 0.60
0.98 0.57 4.95 0.06 0.57
1.00 0.17 4.63 3.09 0.01 19
Table A2.7. Calculated solids assuming a miscibility gap between XAl,total = 0.25-0.65 and
the formation of calcite and Fe-hydroxide. Presented in Fig. 3.7B.
XAl,total
Fe(-Al)-ettringite
[mmol]
Al(-Fe)ettringite
[mmol]
Calcite
[mmol]
Fe-hydroxide
[mmol]
0.00 7.33 - 0.59 0.47
0.10 7.38 - 0.59 0.44
0.25 7.40 - 0.59 0.42
0.30 6.39 1.08 0.59 0.38
0.40 4.48 3.03 0.59 0.36
0.50 2.61 4.93 0.59 0.33
0.60 0.87 6.70 0.59 0.31
0.65 - 7.60 0.59 0.29
0.80 - 7.64 0.59 0.25
0.90 - 7.70 0.59 0.22
0.92 - 7.72 0.59 0.21
0.95 - 7.74 0.59 0.20
0.98 - 7.76 0.59 0.18
1.00 - 7.77 0.59 -