- Conference date: 16-17 November 2005
- Location: Sendai (Japan)
Several gels in the system CaO‐Al2O3‐SiO2 were investigated under soft hydrothermal conditions. The gels were synthesized by co‐precipitation of Ca(NO3)2⋅4H2O, Al(NO3)3⋅9H2O and Si(OC2H5)4 and were reacted under the following hydrothermal conditions: sample/solution = 0.03, NaOH concentration = 4M, temperature = 110°C and duration = 24–192 hrs depending upon the phase formed. The phases formed by hydrothermal treatment varied according to the starting compositions, being (1) hydroxysodalite in SiO2‐rich compositions, (2) hydroxycancrinite in SiO2 and Al2O3‐rich compositions, (3) katoite in CaO and Al2O3‐rich compositions and (4) calcium silicate hydrate (C‐S‐H) in CaO and SiO2‐rich compositions. The C‐S‐H phase, which is more amorphous in nature, showed the greatest uptake of and .
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