Silica Fume Micro Silica Price In Bangladesh

CETEX MICROSILICA is a super pozzolan – a finely powdered material which when added to cementitious matter increases durability and gives higher strength. It complies with ASTM C1240.

ADVANTAGES

• 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

1. 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.

 2. 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.

Packaging:

Available in 25 kg & 40 kg bags.