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Even
after a long time there remains an appreciable amount of unhydrated
cement. For
instance, after 28 days of initial contact with water, grains of cement
have
been found to hydrated to a depth of just
4µm-8µm after a year.
Powers
calculated that complete hydration under normal conditions is possible
only for cement particles smaller than 50µm. However,full
hydration has been
obtained by grinding cement in water continuously for five days.
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