MICRO-SILICA

FOB Reference Price:Get Latest Price
US $120-140 / Metric Ton | 22 Metric Ton/Metric Tons (Min. Order)
Supply Ability:
1000 Metric Ton/Metric Tons per Month
Port:
Kolkata
Overview
Quick Details
Place of Origin:
Maharashtra, India
Brand Name:
CETEX
Packaging & Delivery
Packaging Details
20, 25, or Jumbo bag
Delivery Time
10 days

Specifications

MICRO-SILICA is finely powdered material, added to concrete for higher strength & lower permeability. 25kg or Jumbo bag.

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

 

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.

 

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