HOW TO REPAIR CORRODED RC CEILING PLASTER OF A BUILDING?

ceiling plaster repair

There are many cases where steel reinforcements wear out due to various reasons like lack of cover, leaking of roofs etc. Since steel rust occupies a much greater volume (more than 10 times) than steel, the surrounding concrete tends to crack and get detached from the steel and eventually falls down. This is especially important in ceiling plaster under leaking roofs. If we find any discrepancy in this plaster, it should be rectified as soon as possible. There are many cases in which the ceiling plaster has suddenly fallen off.

Such cases are repaired as follows.

1. Hammer tests the area for loose areas and removes all loose particles of mortar, concrete, rust, etc. from the rough surface and cleans it with a wire brush.
2. Apply two coats of Polymer Modified Active Corrosion Inhibitor to the remaining steel. If additional steel is needed, tie the new steel to the old steel with wires. Two coats of chromate paint may also be an option.
3. Apply a coat of polymer bonding agent (latex based) to the entire area of ​​the steel and concrete to be treated.
4. Apply polymer modified 1:3 cement mortar over the reinforcement and provide the required cover. The addition of super plasticizers to reduce water and incorporate fibers will help produce a stronger mortar. If the area is large, gunniting can be used with additive for quick setting for better efficiency of work.
5. Treat the concrete.
6. If necessary apply a coat of water proofing slurry coating for environmental protection.