The Effect of Silica Fume on the Properties of Concrete

Microsilica‘s Info

Microsilica fume (scientific name "silica fume," Micro-silica or Silica Fume), in the smelting of ferrosilicon and industrialsilicon, silicon through the flue gas emitted by steam oxidation, the specially designed filter collected the amorphous powder like silica (SiO 2).Microsilica fume average 0.1-0.15 μ m in diameter, the size of several cement average 1.0%. Surface area for the 15-27 m 2 / g, with strong surface activity.

When it is used in concrete, it acts as a filler and as a cementitious material. The small microsilica particles fill spacesbetween cement particles and between the cement past matrix and aggregate particles. Microsilica also combines with calcium hydroxide to form additional calcium hydrate through the pozzolanic reaction. Both of these actions result in a denser, stronger and less permeable material.

Microsilica's benefits

Dense castables
Improved flow
Hot strength
Strength during heat-up

Areas of application

Steel and foundry: Blast furnace troughs and runners, ladle linings, sliding gates, etc.
Cement: Preheater linings, lining in the chain system and lining of in- and outlet zones of rotary kilns
Glass and ceramics: Kiln furniture

Specification

Practical guidance

Storage
Microsilica is slightly hygroscopic. A slight increase in moisture content is to be expected from production through shipment and 
during storage. Normally an equilibrium value in the range of 0.8-1.2% is attained depending on the ambient conditions.
Specific limit values for moisture content is restricted to material condition at the time of delivery, unless otherwise 
specified, and tested according to Elkem Standard Test Methods for Microsilica, Test M-1; Water Content.

Dosage
In order to give best results, Elkem Microsilica should be used in quantities of 3-8 wt% of the total dry mix. When optimum 
particle packing is applied, the water demand is normally 4 - 5 % of the total dry weight, depending on the microsilica quantity.

Deflocculants
For microsilica to have the desired flow enhancing properties, it is vital that it is well-dispersed. It is generally advised to 
use a deflocculant. Among a variety of different additives available, we highly recommend to use SioxX in microsilica containing 
castables.

Packaging

1. One ton jumbo bags on pallets in 20" containers

2. Small bags inside ton bags (20kgs, 25kgs, 50kgs per bag)

3. As per customers' requirements

Port of Loading

Tianjin Port & Qingdao Port

Company Info

Anyang Huatuo Metallurgy Co., Ltd. is located in Anyang City, Henan Province of China. Anyang is rich in mineral resources. Our company has very convenient transportation, being near to Tianjin Port. 

Our main productions are: steel-making deoxidizer, refractory raw materials, casting materials, water atomized products, welding powders and other related products. Especially, our best-selling products are ferro alloy powder and silicon-iron alloy.

Our goods are welcomed to the majority of provinces and cities throughout the country and exported to many countries, including the U.S.A., India, South Africa, Mexico, Korea, and Japan.

Certificate