MACt Colloidal Silicate (4Kg)

$70.00 + GST

MACt Colloidal Silicate Concentrate (4Kg)

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SKU: 9DC00-5 Category:


MACt Colloidal Silicate Concentrate (4Kg)


MACt Colloidal Silica contains nano silica particles that are stabilised by different alkali metals which also help in wetting out the concrete and allow it to pass into the smaller cracks and pin holes in the concrete. The pure silica particles have a relatively higher proportion of reactive sites than silicates, so they react very efficiently.

 In the pores, colloidal silica creates new CSH that bonds to the existing CSH. When applied to concrete, it reacts, bonds and then uses that bonded silica as a platform for additional bonding. The colloidal particles will react with any available CH to give CSH. This increases the strength of the binder and reduces micro holes and cracks which in turn “densifies” the concrete. BUT you need life in the concrete for this to work.

 As a densifier for concrete silicates and amorphous colloidal silica is very useful in getting into every crack and imperfection, it reacts with the calcium within concrete and forms calcium silicate hydrate (CSH) gel, one of the strongest and most durable of Portland cement’s hydrates. Densifier refers to the increase in the total binder and reduction of the gaps that are always present in normal concrete.

 Colloidal silica has also recently begun to be applied to freshly placed concrete, formulated with special additives as a troweling aid. Not only does it extend finishing time and make finishing easier, but it eliminates the need to add excess water in order to achieve a smooth surface, thereby delivering a slab that is at least as hard as intended in the mix design. It’s a thickening agent which makes the concrete more thixotropic so it is easier to trowel rather than having it sticky and ripping apart.

 In fact, use of the colloidal silica troweling aid showed significant performance improvements over slabs finished with extra water or finished dry: increased surface hardness (25 percent to 30 percent), reduced tendency towards ASR pop-outs, and reduced curling. This because you have more CSH and less CH available on fresh concrete because you have upped the silica level 


  • VOC free
  • Helps block the penetration of many liquids, chemicals and oils.
  • Helps minimise rubber tire marks in warehouse applications
  • Low viscosity and blended particle matrix provide superior reactivity within the slab
  • Never peels over time
  • Almost eliminates rubber tire marks
  • Eliminates concrete dusting
  • Can be used as a trowel aid by reducing bleed water
  • Will not leave a white cast on floor if overused or not removed
  • Reduces operating costs by increased ease of maintenance and cleaning
  • Used as a moisture barrier for floor coverings

 Other Uses:

  • In shotcrete acts as a stabiliser improving the spray ability and pump-ability characteristics, it reduces rebound and increases maximum thickness build-up and early strength. 
  • In self-consolidating concrete (SCC) and precast – colloidal silica is used to enhance rheological properties in combination with high range water reducing agents (HRWR) poly-carboxylates. 
  • In high performance concrete, colloidal silica reacts with free lime in the concrete, porosity is significantly reduced, making the concrete more durable and resistant to chemical attack.