Better grade of concrete
with lower w/c ratio and well compacted.
A polymeric coating is
applied to the concrete member to keep out aggressive agents. A polymeric coating
is applied to the reinforcing bars to protect them from moisture and aggressive
agents.
Fly Ash - Using a Fly Ash concrete with very low
permeability, which will delay the arrival of carbonation and chlorides at the
level of the steel reinforcement. Fly Ash is a finely divided silica rich powder
that, in itself, gives no benefit when added to a concrete mixture, unless it
can react with the calcium hydroxide formed in the first few days of hydration.
Together they form a calcium silica hydrate (CSH) compound that over time
effectively reduces concrete diffusivity to oxygen, carbon dioxide, water and
chloride ions.
Modified quality of steel
reinforcement which are less susceptible to corrosion such as special grade of
stainless steel, CRS (Corrosion Resistant Steel),TMT steel etc.
Pre-applied impermeable
coating (Epoxy, CECRI & CBRI coating)
Stainless steel or cladded
stainless steel is used in lieu of conventional black bars
Admixtures (Nitrites and
Nitrates) for concreting, which are to be added in the green concrete.
Electrochemical injection
of the organic base corrosion inhibitors, ethanolamine and guanidine, into
carbonated concrete.
Other inorganic
inhibitors, which are known to be migratory in nature. The migration process is diffusion through water
and diffusion through vapour phase.
Structural design aspects
of corrosion control involve factors such as configurational (geometrical) considerations
that minimize or, if possible, eliminate exposure to corrosives
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