REPAIR OF DAMAGED CEMENT MORTAR LINING

INSTRUCTIONS

When repairing damaged cement mortar linings, the following procedures should be used :

Preparation of area

• Remove damaged lining with hammer and chisel.

• Do not disturb surrounding lining.

• Ensure edges are slightly undercut.

• Brush off any loose mortar.

• Thoroughly wet area to be repaired.

Composition of repair mix

• Mix sand and cement dry in proportion of 
  Pipe = 1 sand : 1 cement
  Fittings = 1.8 sand : 1 cement

• Add sufficient potable water to form a thick paste which is workable.

Repair procedure

• Ensure repair area is wet.

• Remove any areas of water accumulations.

• Apply repair mix to area and smooth off.

After – Treatment of Repair Area

• After 200 minutes of completing the repair, dampen the repair area.

• Cover area with wet rags and leave to set in ambient temperature – must be above 4 ^oC.

• In areas of high temperature and low humidity check periodically for 4 hours that rags are wet.

Materials

• Potable water.

• Cement – compatible to original lining as :

  • Ordinary Portland cement

  • Blast furnace slag cement

  • Sulphate Resistant cement

  • High Alumina cement

• Sand – Having an average grain size of 270 – 300 microns. 
  
  

 

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