CETEX Micro-Silica

DESCRIPTION

CETEX MICRO-SILICA is a super pozzolan - a finely powdered material which can be added to cementitious matter to increase durability and to provide a positive set. It complies withASTM C1240.

ADVANTAGES

ü Higher compressive strength by 10-20 %

ü Lower permeability – resistance to penetration of water, chloride & other chemicals

ü Lower free lime formation - delays ettringite and thaumasite formation

ü Controls bleeding in fresh concrete

ü 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:

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

The free lime does not contribute to strength. 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 detoriation. When it 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 cement. It gets well distributed in the paste, thus blocking the bleed-water channels.

PACKING

Available in 25 kg Plastic bag or Jumbo Bag.