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    Home > Coatings News > Paints and Coatings Market > The role of aluminum in CASH when sulfates erode concrete

    The role of aluminum in CASH when sulfates erode concrete

    • Last Update: 2020-11-10
    • Source: Internet
    • Author: User
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    For recent studies, in na
    2
    SO
    4
    solutions (3 and 30 g / L SO
    4
    ),
    using the CASH phase
    was tested to study changes in THESH nanostructure during sulfate erosion of concrete.
    study of Durung, paying special attention to the availability of aluminum in CASH to form calcite.
    calcite only forms above the saturated pH of hydroxycalcite

    .
    the removal of aluminum from cash reduces the Al/Si ratio and average chain length (MCL) of the CASH phase.
    did not form calcite in solutions below the saturation pH of hydroxycalcite.
    here, decalcification in the CASH phase leads to an increase in MCL.
    is controlled by the availability of calcium
    in
    CASH, which is exposed to na
    2
    SO 4 solutions, is controlled by the availability of
    calcium.
    in CASH, sodium is adsorbed to the protonized silane alcohol group.
    at 3g /L SO
    4
    , SO
    4
    2-
    ions are absorbed by calcium on the deprotonized silane alcohol group, but at 30g/L SO
    4
    , they are also bonded to other bits in CASH.
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