Penetration
of chlorides
Chlorides can reach into the concrete
from the use of de-icing salts, from seawater or from the air (e.
g. sea-air, PVC-Fire). In the presence of humidity and oxygen, corrosion
can occur due to a critical free chloride content at the surface
of the reinforcement. As in the case of carbonation, the quality
of the concrete cover is decisive for the avoidance of corrosion.
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Figure 1: Influence of ggbs on the diffusion
coefficient for chloride [Bro83]
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Figure 2: Influence of fly ash (FA) on
the migration coefficient for chloride [Wie00]
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The use of cements containing ggbs
or fly ash can result in an significant increase in the resistance
against chloride penetration (Figures 1 and 2). This can
be attributed to the reduction of capillary pores and the higher
amount of finer pores in the cement paste when using these
cements.
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