• Higher compressive strength by 10-20 %
• Reduces the rate of carbonation
• Lower permeability – resistance to penetration of water, chloride & other chemicals
• Lower free lime formation - delays ettringite and thaumasite formation
• Controls bleeding in fresh concrete
• Lower Heat of Hydration, which prevents formation of cracks.

 

PROPERTIES

Appearance	Very fine powder
Colour	Grey
Odour	Odourless
Mean particle size	25 microns
SiO2	Silica 85 % minimum
Humidity	2 % maximum
Loss on ignition at 800°C	4 % maximum

 

 

HOW IT WORKS

Pozzolonic effect : When water is added to cement, hydration occurs as shown below:

Ordinary Portland Cement (OPC) + H2O → CSH (Calcium silicate hydrate) + Ca(OH)2(Free lime)

The free lime does not contribute to strength of concrete. When combined with carbon dioxide, it forms a soluble salt, which leaches through the concrete causing efflorescence, a familiar architectural problem. Concrete is also more vulnerable to chemical attack and deterioration.

When CETEX Microsilica is added, the following reaction takes place:

Ca(OH)₂ + SiO₂ → H₂0 + CSH

The reaction reduces the amount of calcium hydroxide in the concrete.

Micro filler effect : It is an extremely fine material, with an average diameter much finer than the cement. It gets well distributed in the cementatious paste, thus blocking the bleed-water channels.

PACKING

Available in 25 kg Plastic bag or Jumbo Bag.

 

Trade Information