Corrosion Resistant Concrete

The corrosion of reinforced steel is a universal problem in concrete. It is one of the primary reasons for loss of durability of concrete. Proper compacting and leaving no voids is how the rate of corrosion can be controlled. Even in properly compacted concrete, there is a 1-2% chance of voids through which moisture can pass leading to corrosion of steel. Steel embedded in concrete can expand 5-6 times more than its original volume due to corrosion, causing stress and cracks. These cracks further expose the steel and further the corrosion process.

Hindustan RMC has introduced a special concrete called ‘Rust Proof’ to overcome corrosion problems. It uses anti-corrosion agents that form a protective coating over the steel diminishing the rate of corrosion of embedded steel. Thus, the steel and the entire structure stays intact for long.

Advantages

  • Concrete stays intact for longer periods of time.
  • Increased life of the structure
  • No need of pre-coating to steel bars and concrete surfaces leading to savings

Usage

  • Reinforced Steel used should be rust-free.
  • Reinforced Steel should be washed with cement slurry before concrete is placed.
  • Proper compacting and no voids – proper shuttering and vibration.
  • Specified depth of cover, as per BIS standards, should be strictly provided.
  • Cover blocks provided to the reinforcement should not be displaced during compaction. If displaced, they should be restored immediately before placing the concrete.
  • If cover blocks are displaced, the same should be restored immediately before placing the concrete
  • In very aggressive and saline exposure, protective epoxy or equivalent coatings to the concrete may also be provided.

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