The problem of reinforcement
corrosion in new
concrete structures can be avoided if measures are taken to
increase the corrosion initiation time. These measures include providing
adequate concrete
cover thickness, ensuring a low
permeability of the cover
concrete, and limiting
early age concrete cracking. As adequate concrete cover
is normally not a problem, this paper highlights the findings of two studies
that focus on the latter two measures. The first study investigated chloride
ingress under given climatic conditions and evaluated the feasibility of measuring
the permeability of concrete cover in situ. The second study used numerical
models to investigate the effects of early age
cracking and determine measures
to be taken to limit their development during construction. The principal
findings of both studies are given herein. It is concluded that permeability
measurements should be conducted for quality control of the cover concrete of
new structures and that early age cracking due to the hydration of young
concrete may be limited by reducing the difference between concrete and ambient
temperature.
More abstracts about the From Corrosion of Existing to Durability of New Concrete Structures