GGBFS concretes have proved to
be susceptible to surface scaling. The reason for this poor
performance characteristic is not
yet known and will be
investigated in this project. Previous studies have shown that
carbonation in the concrete's top
layer could be a major cause of
the decreased scaling resistance
in GGBFS concrete. Twelve
mixtures will be tested for scaling
resistance. Again, 0%, 30% and
50% GGBFS replacement levels
and two coarse aggregates will
be tested. Two cement brands
will be studied. For each mix, there will be four different curing
conditions for the sample blocks. In addition, two curing methods
to reduce carbonation in the
concrete will be investigated at
the 30% and 50% replacement
levels. The blocks will be ponded
with a salt water solution and
subjected to cyclic freeze-thaw
conditions for 60 to 100 days. After every five cycles, the
amount of scaling will be
measured.
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