SILICA FUME
Improve Strength, Durability and Rheology
Silica Fume
What is Silica Fume?
Fig.1 Chemical Composition
Unit | Portland Cement | Slag | Flyash | Silica Fume | |
---|---|---|---|---|---|
CaO | % | 60 - 67 | 32 - 48 | 1 - 5 | 0.1 - 0.6 |
SiO2 | % | 17 - 25 | 28 - 40 | 40 - 55 | 86 - 95 |
Al2O3 | % | 2 - 8 | 10 - 22 | 20 - 30 | 0.2 - 2.2 |
Fe2O3 | % | 0 - 6 | 3 - 5 | 5 - 10 | 0.2 - 2.2 |
MgO | % | 0.1 - 4.0 | 2 - 16 | 1 - 4 | 0.3 - 3.5 |
SO3 | % | 1 - 4 | 2 - 4 | 0.4 - 2.0 | 0.4 - 1.5 |
Na2O | % | 0.1 - 1.0 | 0.2 - 1.2 | 0.1 - 2.0 | 0.2 - 1.8 |
K2O | % | - | - | 1 - 6 | |
Silica Fume Application In Concrete
Low Heat Concrete
Infrastructure, Buildings, Industrial
Low Heat Concrete
Waterproof Concrete
Infrastructure, Buildings, Industrial
Waterproof Concrete
Corrosion Resistance
Infrastructure, Buildings, Industrial
Corrosion Resistance
High Strength Concrete
Infrastructure, Buildings, Industrial
High Strength Concrete
Self-Compacting Concrete
Infrastructure, Buildings, Industrial
Self-Compacting Concrete
Sulphate Resistance
Infrastructure, Buildings, Industrial
Sulphate Resistance
Chemical Resistance
Infrastructure, Industrial
Chemical Resistance
Abrasion Resistance
Infrastructure, Industrial
Abrasion Resistance
Shotcrete
Infrastructure
Shotcrete
How Does Silica Fume Improve Concrete?
Pozzolanic Reaction
When water is added to OPC, hydration occurs forming two products, as shown below:
OPC + H2O -> CSH (Calcium silicate hydrate) + Ca(OH)2
In the presence of silica fume, the silicon dioxide from the silica fume will react with the calcium hydroxide to produce more aggregate binding CSH as follows:
Ca(OH)2 + SiO2 + H20 -> CSH
The reaction converts the calcium hydroxide into calcium silicate hydrate (which is the binder in concrete) as shown in Fig. 2. The weaker calcium hydroxide does not contribute to strength. When combined with carbon dioxide, it forms a soluble salt which will leach through the concrete causing efflorescence, a familiar architectural problem. Concrete is also more vulnerable to sulphate attack, chemical attack and adverse alkali-aggregate reactions when high amounts of calcium hydroxide is present in



Microfiller Effect
The silica reacts rapidly (Fig 5) providing high early age strengths and durability. The efficiency of silica fume is 3-5 times that of OPC and consequently vastly improved concrete performance can be obtained.

Project Profile
Changi Water Reclamation Project (CWRP) Singapore
We are proud to be the Silica Fume Supplier to the Concrete Manufacturer for this project required to supply High Durability Concrete to meet the durability requirement.
Changi Water Reclaimation Project (CWRP) which was officially opened in August 2006 is a milestone event in the development of sanitation system in Singapore using the latest technology. The implementation of CWRP transforms the management of waste water in Singapore and provides high sanitation standards in Singapore for generations to come. Today in Singapore we consume about 300 million gallons of clean water a day. Changi Water Reclamation Plant (CWRP) provides the solution to the needs to increase water capacity with the state of art, compact and covered facilities.
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We understand that choosing the correct solution and type of product is essential for the success of any project. Scancem Materials has a technical support team with many years of concrete industry experience and successful project applications and are ready to help you find the right solution for your application.