A well cast reinforced concrete element should be able to resist the
penetration of water even under high water pressure, protecting its
integral steel from corrosion. In reality, it is very difficult (even
with most modern production plants) to produce such a perfect reinforced
concrete mass, since the smallest inconsistency (such as aggregation of
gravel) can cause imperfections in the concrete. Often, the water which
penetrates into reinforced concrete is acidic and hence has an
aggressive effect on the basic chemical elements of the concrete, as
well as the steel reinforcement. This ultimately leads to the decay of
the composite element. Small cracks can easily occur in the outer
sections of a cast concrete mass during the curing period due to
shrinkage. Concrete structures are also susceptible to cracking due to
oscillations caused by traffic, as well as settlement of the underlying
soil and natural phenomena such as earthquakes. The steel reinforcement,
especially on the side adjacent to the outer surface, is particularly
at risk from corrosion caused by the ingress of water via these cracks
and via micro-cracks by flexure of the element during its service life.

BENTOFIX® BFG 5000 is a concrete sealing system which efficiently
protects reinforced concrete structures, preventing the penetration of
water and providing protection to the structure from attack by
aggressive chemical substances present in the local surrounding soil.