Problem: Corrosion in the steel used in column, lintel and beam as well as cracking, rust staining and delaminating of concrete surface.
Structural Details: The hyperbolic cooling tower of power plant which is 450 feet long and 360 feet diameter having column and lintel beam in slip form. It was subjected to intermittent dry and wet conditions and therefore was susceptible to corrosion. It is low cost comparative to mechanical draft cooling tower.
Cause: The water which is in use has presence of chloride in it and can easily corrode embedded steel in concrete. Once there is crack in the concrete, there is more possibility of intrusion of chloride and oxide along with the air causing delaminating and rust staining of the concrete.
Our Approach: To improve the life of cooling tower, corrosion induced deteriorated concrete need to be removed including cleaning and protection of the reinforced steel and re-stabilizing original concrete. At each repair site the concrete was chipped and the exposed steel needs to be sandblasted and coated with a protective layer and concrete is re-filled by grouting with fiberglass jackets. Because of the height of the structure, the magnitude of challenges in protecting the private and public property surrounding the area was huge and to be dealt with rig-type of platform system to work for.
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