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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 934
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     one of the afm phases in hydrated portland cement is ca3(alxfe2 − x)o6.caco3.nh2o. it is based on hexagonal and platey structural elements and the interlayer structure incorporates co32−. the solid phases were experimentally synthesized and characterized by different techniques including x-ray techniques (xrd and exafs) and vibrational spectroscopy techniques (ir, raman). fe-monocarbonate (fe-mc) and al-monocarbonate (al-mc) were found to be stable up to 50 °c, while fe-hemicarbonate (fe-hc) was unstable with respect to fe-mc in the presence of calcite. fe-mc has a rhombohedral view the mathml source symmetry which is different from the triclinic of the al analogue. both xrd and thermodynamic modelling of the liquid compositions indicated that al-mc and the fe-mc phases do not form solid solution. the solubility products were calculated experimentally at 20 °c and 50 °c. under standards condition the solubility products and other thermodynamic parameters were estimated using temperature-solubility product extrapolation and found to be logks0 (fe-mc) = −34.59 ± 0.50, logks0 (fe-hc) = −30.83 ± 0.50 and logks0(al-mc) = −31.32 ± 0.50.

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