Micro Silica
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Technical characteristics
- Country of manufactureIndia
- Type of additiveIncreasing strength
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 with ASTM
C1240.
ADVANTAGES
Higher compressive strength by 10-20 %
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:
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 20 kg Plastic bag or Jumbo Bag.
C1240.
ADVANTAGES
Higher compressive strength by 10-20 %
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:
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 20 kg Plastic bag or Jumbo Bag.
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Micro Silica