Commercial buildings

Elkem Microsilica® is used in the construction of the world's tallest buildings. A classic example is the Burj Khalifa in Dubai.

Transport: Road, rail & air

Elkem Microsilica® has a proven track record of adding value in construction projects for transport infrastructure.

Sustainability

Using Elkem Microsilica® helps reduce embodied CO2 of concrete.

High performance concrete

For over 30 years, the world’s most prestigious construction projects have put their trust in Elkem Microsilica®.  Microsilica makes concrete stronger, more durable and sustainable.

Benefits of Elkem Microsilica® in Concrete

  • Longer Service Life
  • Corrosion resistance
  • Higher Strength
  • Particle packing & Mix design
  • ASR & Sulfate resistance
  • Rheology
  • Sprayed concrete

Longer service life for concrete elements & structures

Microsilica is a highly reactive pozzolan and gives concrete a denser microstructure, lower permeability & higher electrical resistivity leading to improved durability.  
The durability of a reinforced concrete structure can be defined as the capability of the structure to maintain its original functional and structural characteristics during the expected service life in the exposure conditions it was intended for.

Combined with correct design and workmanship, microsilica concrete offers characteristics that will ensure long term durability and service life.  Visit Life-365.org  

Preventing corrosion of reinforcement in concrete

The addition of Elkem Microsilica® helps to increase time to initiation of corrosion - by reducing the permeability of concrete, microsilica significantly reduces the rate of penetration of chloride ions into the concrete.

In addition to protection provided by reduced permeabilty, concrete with Elkem Microsilica® has higher electrical resistivity.  Increased electrical resistivity helps reduce the rate of corrosion. Increased electrical resistivity of microsilica concrete is due to the reduced alkali ion concentration in the pore solution, and a more discontinuous capillary pore structure.

Higher strength concrete

Elkem Microsilica® is used to make the high strength concrete that is often essential in major projects, such as record breaking tall buildings. 
These engineering applications requiring high strength concrete (>80 MPa) use microsilica as a cost effective means to increase compressive strength.  Ultra-high strength concrete (UHSC), typically defined as >150MPa can be achieved using higher dosages of Elkem Microsilica®.  Increased strength results from microsilica’s particle packing & pozzolanic reaction.  In microsilica concrete, the thickness of the transition zone (interface) between the cementitious paste and aggregate is reduced and the CH crystals are smaller and more randomly oriented, resulting in decreased porosity & increased interface bonding strength.

Contact Elkem
for information on high strength concrete mix designs with microsilica.

Particle packing & Mix design

Elkem Microsilica® improves the particle packing of concrete and mortar mixtures.

Our EMMA mix design app is available as a free download, helping engineers design concrete mixtures with optimum particle packing. 

Watch this instruction video on using the EMMA app.  Before using the app please read the disclaimer in the pdf user guide which is included with the download.

Download the EMMA app here

Preventing ASR & sulfate attack of concrete

Elkem Microsilica® is used to help give concrete integral protection from damage by chemicals, including alkali-silica reaction (ASR) and sulfate attack. 

Chemical attack on concrete takes place either by leaching of calcium hydroxide or by ingress of harmful substances, such as sulfates or nitrates. Since Elkem Microsilica® reduces the amount of soluble calcium hydroxide, leaching is reduced, and less is available for the harmful expansive reactions caused by sulfates and nitrates. 

The addition of microsilica reduces the permeability of concrete. This retards the leaching and ingress of materials from, or to, the interior of the concrete. Consequently, high performance concrete designed with Elkem Microsilica® can possess superior resistance to chemical attack.

Improving rheology of concrete, mortars & grouts

Elkem Microsilica® plays an important role in improving the rheology of concrete, mortar and grout mixtures.  

 Microsilica helps prevent both bleeding and segregation. This is due to the strong internal forces caused by the large surface of the microsilica particles, and improved particle packing in the mixture.

 A small dose of microsilica helps improve pumpability of concrete and makes self-compacting concrete (SCC) more robust.

Reducing sprayed concrete rebound and wastage

Microsilica is extensively used in sprayed concrete applications. Benefits are numerous, both in the dry and wet processes and include:
  • Reduced rebound
  • Increased cohesiveness and stickiness
  • Less dust generation
  • Increased layer thickness
  • Reduced need for accelerator
  • Improved wash-out resistance
  • Improved bond to substrate and reinforcement
  • Improved properties of hardened concrete, including strength and durability

Elkem Microsilica® Powder

Elkem Microsilica® powder for concrete is the original silica fume product.

Emsac® 500 Microsilica Slurry

Emsac® 500 is an aqueous suspension of Elkem Microsilica®

Elkem Microwhite® for Concrete

Elkem Microwhite® is a high purity, white silica fume.  High quality, consistent properties and lightness of colour are the special characteristics of Elkem Microwhite®.