- If possible position the pipe with the damaged area at invert levels.
- Carefully chip out the damaged lining. Undercut the edges of the surrounding sound lining to from a key for the repair.
- Clean away all the loose debris.
- Thoroughly wet the exposed metal surface and the edges of the lining around exposed area.
- Prepare the mortar for repair. The mortar should be stiff and consist of one part cement (40% of OPC/MAC/SRC and 60% of white cement) to 1.5 parts dry washed coarse sand and be mixed with single shot solution / fevicol adhesives and little fresh potable water.
- Place the mortar with a hand trowel and work it well into the edges of the existing lining.
- Built up the repair to a thickness just above that of the original lining and finally smooth down to the required thickness using a piece of wood/smooth emery paper.
- Cover the repaired lining with a wet cloth/ jute to prevent rapid evaporation until mortar is sufficiently hardened.
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Instruction for cement mortar lining repair of DI pipes
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