500kgs/jumbo bag with UV& waterproof and wooden pallet or as customers request
Xiamen Port or as request
1 - 60
61 - 100
To be negotiated
ASTM C 1240-05
SGS certificate with ASTM-C1240 Standard
ASTM C 1240-05
Oversize variation % point from average
Pozzolanic Activity Index (7 days)
Microsilica fume (scientific name "silica fume," Microsilica or Silica Fume), in the smelting of ferrosilicon and industrial silicon, silicon through the flue gas emitted by steam oxidation, the specially designed filter collected the amorphous powder like silica (SiO 2). Micro-silica 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.
1).Appearance is as grey&white off. 2).High electrical resistivity 3).Low Permeability 4).Superior resistance to chemical attack from chlorides,acids and sulfates 5).Low chloride ion diffusion 6).High reactive Pozzolan 7).High temperature strength 8).Improved stability ingeothermal environment
Properties of Silica Fume
Dark grey / Light grey
This term simply means that silica fume is not a crystalline material. A crystalline material will not dissolve in concrete, which must occurbefore the material can react.
Silicon dioxide (SiO2)
85% to 97 %
This is the reactive material in silica fume. Because of its very high amorphous silicon dioxidecontent, silica fume is a very reactive pozzolanic material in concrete. As theportland cement in concrete begins to react chemically, it releases calciumhydroxide. The silica fume reacts with this calcium hydroxide to form additional binder material called calcium silicate hydrate. It is largelythis additional binder that gives silica-fume concrete its improved hardenedproperties.
The bulk density ofthe as-produced fume depends upon the metal being made in the furnace and upon how the furnace is operated. Because the bulk density of the as-produced silica fume is usually very low, it is not very economical to transport it for long distances.
Specific surface area:
Specific surface is the total surface area of a given mass of amaterial. Because the particles of silica fume are very small, the surface area isvery large. We know that water demand increases for sand as the particlesbecome smaller; the same happens for silica fume.
< 1 µm
Silica fume particles are extremely small, with more than 95% ofthe particles being less than 1 µm . Particle size is extremelyimportant for both the physical and chemical contributionsof silica fume in concrete.
Specific gravity is a relative number that tells how silica fumecompares to water, which has a specific gravity of 1.00. Silica fume has a specific gravity of about 2.2, which is somewhat lighter than portland cement,which has a specific gravity of 3.15. Thus, adding silica fume to a concretemixture will not “densify” the concrete in terms of increasing the density ofthe concrete.
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