RELIABILITY STUDY OF HIGH PERFORMANCE CONCRETE UNDER CARBONATION ATTACK: A REVIEW
Keywords:
Corrosion of steel in concrete, High performance concrete, Chemical attack, Chloride, Zinc, Azadirachta Indica (Neem), Potentiometer.Abstract
Even though the concrete can be a very strong material, it is also subjected to deterioration. The durability of a concrete structure is affected when it is prone to chemical actions (carbonation, chloride attack, sulphate attack etc). This chemical action may cause cracking of concrete, volume change and deterioration of structure. The penetration of chemical ions and carbon dioxide into the concrete leads to dissolution of thin oxide protective layer surrounding the reinforcing steel, thus affecting the durability of structure and leading to premature failure. Different measures are used to prevent the steel bars from these chemical attacks. Coating steel bars with layers of zinc is one such economical method to protect reinforcing steel concrete structures. In this experiment, the steel bars will be coated with zinc powder and neem powder, the beam specimen will be casted and subjected to saline curing and the corrosion potential of the reinforcement will be measured by using half-cell potentiometer.
