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Thermodynamic investigation of the CaOAl2O3CaSO4K2OH2O system at 25°C

✍ Scribed by D. Damidot; F.P. Glasser

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
479 KB
Volume
23
Category
Article
ISSN
0008-8846

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✦ Synopsis

An equilibrium phase diagram has been calculated for the CaO-A1203-CaSO4-K20-H20 system at 25°C for several KOH concentrations. These KOH concentrations were chosen to relate to cement pore fluid compositions and published experimental data. In addition to the hydrates found in the CaO-A1203-CaSO4-H20 system, syngenite and K2SO4 have to be taken into account. Thus new invariant points and boundary curves are defined for high potassium and sulphate concentrations. The general features of the system at higher temperatures, to 100°C, are outlined: above 40°C, the pentasalt, (CaSO4)5.K2SO4.H20, becomes a stable phase.

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