Combex Concrete and mortar expander


Combex is an advanced concrete and mortar admixture. It provides a controlled expansion when added to concrete or mortar. Combex is used where conjunction is required.

Category Tag


ASTM C827 / C827 M, ASTM C806, ASTM C940


  • The mortar used in steel structures and heavy machinery
  • Injections for dams and tunnels
  • repairing of concrete structures where any shrinkage of concrete or mortar is to be avoided


  • Provides a controlled expansion
  • Prevents shrinkage and cracking
  • Eliminates bleeding
  • Accelerates time to obtain initial and final strength
  • It can be used with all types of Portland cement
  • Increases the compressive strength of concrete and mortar
  • The product is free from iron particles and hence any possibility of development of points and blotches of rust is eliminated


25 kg bags


  • Physical state: Powder
  • Color: Gray
  • Chloride content: nil
  • Expansion time: 15-120 minutes (temperature above 20 0C reduce expansion time)
  • Expansion rate: 4% free expansion


Combex should be added to the concrete or mortar mixture. (About 5 to 7 minutes is necessary to combine).

Note: curing is necessary after placing concrete


Depending on demand expansion in the cement and ambient temperature, a dosage of between 0.2 and 0.8 percent by weight of cement for mortar and between 1.0 and 3.0 percent by weight of cement for concrete is recommended.


Shelf life: 1 year in the original package

Storage condition: should be protected from direct sunlight. Keep pail in the temperature range between +10°C and +30°C


It should not be swallowed or allowed to contact with skin and eyes. In case of contact with eyes rinse immediately with plenty of water.


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