To repair water tanks, first
expose the reinforcement in all damaged areas using steel wire brushes or by
mechanical means. There should be at least 6mm gap behind reinforcement to
facilitate cleaning, coating etc. apply a rust removing solution of Rusticide
by cotton waste swab or by brush. After 24 hours apply a passivating coat of
Polyalk Fixprime/cement slurry. (No water added to slurry).
Apply two more coats of similar
slurry after an interval of 6 to 24 hours between two successive coats.
After interval of 4 hours :
- Apply
a priming cum bonding coat of Polyalk EP Cement slurry in 1:1 proportion
(by weight) to damaged concrete surface. (No water added to slurry)
- Immediately
place Polymer modified mortar by hand mix.
- Replaster
the surface by applying bonding of Polyalk EP Cement slurry in 1:1
proportion (by weight) to the damaged concrete surface.
- Cure
the plaster as usual.
- Inject
the Polymer Cement Grout of Polyalk EP. Cement water in the proportion of
1:3:2 if required with a pressure of 2 kgs/cm2, seal the
grouting nipple with polymer modified mortar.
- Clean
the surface thoroughly and moisten with water.
- Apply
a waterproofing coat of Polyalk WP/Cement slurry in proportion 1:1.25 (by
weight) with brush to bottom and side of the tank.
- Apply
two more coats of similar slurry after an interval of 24 hours between two
successive coats.
- After
48 hours cure the coating by sprinkling water for 4-5 days.
