Micro Silica Flour
Micro silica flour is the industry powder which product ferrosilicon and metallic silicon, it is made by recycling. Because it use high temperature electric stove to product ferrosilicon and metallic silicon, the volatile silicon oxidation turns into the silicon dioxide in the air, forms into the small pellet in the air(diameter during 10~100nm), is recycled by dust-removed equipment. It is called Micro Silica flour production after it is packaged (popularly named silicon ash). The micro silicon powder mainly uses in the cement or the concrete material, so that to improve the cement or the concrete performance. The configuration of the strong special concrete has ultra excels in (above C70) wear-resisting, erosion resistance, anti-corrosive, anti-infiltration, antifreeze. It widely used in dam, large reservoir, hydroelectric power station, harbor wharf, railway bridge, highway project.
Because particle size of the micro silica flour is only about1% of the cement, thus it may fill crevice between the cement, enhances the density of the system, improves strength, impermeability, wear-resisting, erosion resistance, anti-corrosive, antifreeze performance and so on. The experiment indicated that, mixes about 6~8%the micro silica flour to replace cement, the cement mortar intensity does not reduce, approximately increases with the water volume 20%, but the same pressure infiltration height ratio only has 0.3. Obviously the micro silica flour combined use of super plasticizer, can largely enhances the concrete intensity and infiltration and so on the overall performance after removing unnecessary moisture.
The table below is the company's micro silica flour physical chemical performance indicators:
Application method and attention to the issues:
Volume: Recommended for the content of 6~8%.
Impermeability of the concrete, concrete resistance of seawater erosion, abrasion -resistance concrete mixes the silica flour, approximately increases 10% water volume, and keeps the intensity invariable.
Preparation excels in intensity, dry-strength concrete should be combined use of super plasticizer, should be used with intensity concrete with low sodium low gas super plasticizer.
It takes more than 30S mixing time than ordinary concrete to use silica flour concrete, in order to ensure uniform mixing.
Twice rolling and pressing: In order to prevent excessive quickly evaporation from surface cracks, it is better to cover to roll the surface and press on concrete before final setting after rolling and pressing.
Moisture Conservation: Must be to moisture conservation for concrete, and in the humid environmental conservation is more than 14 days, conservation methods can be water-poured moisture conservation, coverage moisture conservation, or water-stored conservation after final setting reaches to 2 to 4 hour.
The guarantee time of the product is 24 months, must be pay attention to moisture-proof in the process of storage and transportation.
Package: The packing of the product is the plastic-weaving bag lining plastic bag inside, 25 or 30 kilogram per bag.
Extra density micro silica flour 50 kilogram per bag