Sika Cavex Expansion Agent 800g



Cavex® is an expansion agent containing a blend of

aluminium powder and other ingredients and is used

in cement grouting situations wherever a controlled

expansion to compensate for water loss and plastic

settlement is required. Cavex® has been formulated

for use in Portland cement grouts and masonry blockfill to provide expansion after placement of grout, before initial set occurs.


Cavex® is ideal for all types of cement based grouts where a post placement volume increase of the wet mix is desirable to maintain adhesion to all adjacent surfaces. Applications range from neat cement / water grouts through to masonry blockfill. Typical uses are:

  • Ready mixed grout for blockwork, brickwork cavities
  • Neat cement grouting for cable ducts, ground anchors, stabilisation work, etc.
  • Sand / cement mixes for grouting behind tunnel linings, pipe sleeves, etc.


  • Eliminates plastic settlement in the grouting mix
  • Produces a controlled expansion before initial setting.
  • As porous masonry blocks absorb water from the grout the plastic expansion maintains a contact pressure at the interface until the blockfill starts setting.
  • The blockfill can then bond with the masonry unit to become a composite structure
  • Provides improved bond between hardened masonry blockfill and both the reinforcement and inner surfaces of the masonry cells
  • Provides a volume increase to wet mixes - helping to fill voids in tunnel linings, cable ducts, etc.
  • Eliminates the need for revibration - enabling grout lift height limitations to be relaxed, as allowed for in the NZ Masonry Filling Standards
  • Produces a stable and plastic grout - prevents the upward movement of bleedwater which would otherwise become trapped underneath the lower faces of reinforcement and other projections.


Packaging 800 g pots

Appearance / Colour Silver grey powder

Shelf Life Six (6) months when stored according to stated conditions.

Storage Conditions Store in unopened, original containers in cool dry conditions below +25°C.

Total Chloride Ion Content Nil

CODE: N30447520


SKU N30447520
Brand Sika

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