Monday, December 13, 2010

Methods of reducing corrosion for structural Reinforcement


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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