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Micro Silica Fume (Silica Fume)

Micro Silica Fume (Silica Fume)

Micro silica fume is also called "silica fume". When we smelt silicon materials, a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, which are quickly oxidized and precipitated with air after the gas is discharged.
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Micro silica fume is also called "silica fume". When we smelt silicon materials, a large amount of highly volatile SiO2 and Si gases are produced in the submerged electric furnace, which are quickly oxidized and precipitated with air after the gas is discharged. The whole process needs to be recycled with advanced scientific environmental protection equipment. The collected silica fume is lighter than 200kg/m3, which is not easy to transport and use. Therefore, we reprocess it through densification, classification, selection, purification and other processes Afterwards, it can meet YB/T115-2004, GB/T176-2008, GB/T 21236-2007, ASTM C1240-03 and other standards.
 
The micro-silica fume can fill the pores between cement particles, and at the same time form a gel with the hydration product, and react with the alkaline material magnesium oxide to form a gel. In the cement-based concrete, mortar and refractory castables, mix an appropriate amount of silica fume:
 
1. Significantly improve compressive resistance, flexural resistance, impermeability, corrosion resistance, impact resistance and wear resistance.
 
2. It has the functions of retaining water, preventing segregation and bleeding, and greatly reducing the resistance of concrete pumping.
 
3. Significantly prolong the service life of concrete. Especially in harsh environments such as chloride pollution erosion, sulfate erosion, and high humidity, the durability of concrete can be doubled or even several times higher.
 
4. Significantly reduce the floor dust of sprayed concrete and castables, and increase the thickness of a single spray layer.
 
5. It is a necessary component of high-strength concrete, and C150 concrete has been used in engineering.
 
6. It has about 5 times the effect of cement. It can reduce costs and improve durability when used in ordinary concrete and low cement castables.
 
7. Effectively prevent the occurrence of concrete alkali aggregate reaction.
 
8. Improve the compactness of castable refractories. When coexisting with Al2O3, it is easier to form mullite phase, which increases its high temperature strength and thermal shock resistance.
 
 
 
Silica fume:
 
Appearance: gray or off-white powder
 
Refractoriness:>1600℃
 
Bulk density: 200~250 kg/cubic meter.
 
Item: SiO2 Al2O3 Fe2O3 MgO CaO NaO PH
 
Average: 75~96% 1.0±0.2% 0.9±0.3% 0.7±0.1% 0.3±0.1% 1.3±0.2% neutral
 
The fineness of silica fume: more than 80% of the silica fume has a fineness of less than 1 µm, with an average particle size of 0.1 to 0.3 µm, and a specific surface area of ​​20 to 28 m2/g. Its fineness and specific surface area are about 80-100 times that of cement and 50-70 times that of fly ash.
 
Particle morphology and mineral phase structure: During the formation process of silica fume, due to the effect of surface tension during the phase transition, amorphous spherical particles of amorphous phase are formed, and the surface is relatively smooth, and some are multiple spherical particles Agglomerates stuck together. It is a volcanic ash material with a large specific surface area and high activity. For materials mixed with silica fume, tiny spheres can play a lubricating effect.
We could not find any corresponding parameters, please add them to the properties table
Packing specification: 20kg/25kg/50kg/550kg/950kg/1000kg
 
Silicon content: 85-97 (%)
 
Particle size: 45um sieve residue
 
Analysis Project  970U/D  940U/D  920U/D  880U/D  850U/D 
SiO2,  %≥  96.0  93.0  91.0  88.0  85.0 
AL2O3 , %≤  1.0  1.0  1.5  --  -- 
Fe2O3  ,%≤  1.0  1.0  2.0  --  -- 
CaO+MgO,%≤  1.0  1.5  2.0  --  -- 
K2O+Na2O,%≤  1.0  1.5  2.0  --  -- 
C,%≤  1.0  2.0  2.0  2.5  3.0 
Caustic soda,%≤  1.0  3.0  3.0  4.0  4.5 
PH value%≤  4.5~6.5  4.5~7.5  4.5~7.5  4.5~8.5  4.5~8.5 
Particle size (45um sieve residue),%≤  3.0  3.0  5.0  8.0  8.0 
Specific surface area,㎡/g%≥  15 
Moisture,%≤  1.0  2.0  2.5  3.0  3.0 

 

Microsilica fume is suitable for commercial concrete, high-strength concrete, self-leveling concrete, unshaped refractory materials, dry-mixed (pre-mixed) mortar, high-strength non-shrinkage grouting, wear-resistant industrial floor, repair mortar, polymer mortar, thermal insulation Mortar, impermeable concrete, concrete compacting agent, concrete preservative, cement-based polymer waterproofing agent; reinforcement of rubber, plastic, unsaturated polyester, paint, coating and other polymer materials, modification of ceramic products, etc. .
 
Suitable for mortar and concrete: high-rise buildings, seaports, reservoirs, dams, water conservancy, culvert gates, railways, highways, bridges, subways, tunnels, airport runways, concrete pavements and coal mine tunnels, etc.
 
High-grade, high-performance, low-cement refractory castables and preforms in the material industry have a service life three times that of ordinary castables. The refractoriness is increased by about 100℃, and the high-temperature strength and thermal shock resistance are significantly improved. Has been widely used in: coke oven, ironmaking, steelmaking, steel rolling, non-ferrous metals, glass, ceramics and power generation industries. Large iron trench and ladle materials, breathable bricks, smear repair materials, etc.
 
Craftsmanship
 
Self-flowing refractory casting material and dry and wet spraying construction application.
 
Oxide-bonded silicon carbide products (ceramic kiln furniture, flame screens, etc.).
 
High temperature type calcium silicate lightweight heat insulation material.
 
The electric porcelain kiln uses corundum mullite to push the board.
 
High temperature wear-resistant materials and products.
 
Corundum and ceramic products.
 
Sialon combined products. In addition to being widely used in castable refractories, it has also been widely used in fused and sintered refractories.
 
New wall materials and facing materials:
 
(1) Polymer mortar, thermal insulation mortar and interface agent for wall insulation.
 
(2) Cement-based polymer waterproof material.
 
(3) Lightweight aggregate thermal insulation and energy-saving concrete and products.
 
(4) Putty powder processing for interior and exterior wall construction.
1. This product is packed in woven bags. The packaging specifications are: 25kg/bag, 20kg/bag, 950-1000kg ton bag or customized packaging according to customer needs.
 
2. This product should be stored in a dry, rain-proof and shaded environment. The product agglomerates with water and loses its activity. It is forbidden to expose to the sun for a long time to avoid weathering of the packaging bag and spilling of the product.
 
3. This product is not classified as dangerous goods, and the transportation can be in accordance with the "Non-Dangerous Goods Regulations"
Matters needing attention in the use of micro-silica powder:
 
1. Dosage: generally 5-10% of the cementing material. The doping method of micro silicon powder is divided into internal mixing and external mixing:
 
(1) Internal mixing: Under the premise of the same amount of water added, 1 part of micro-silica fume can replace 3-5 parts of cement (weight) and keep the concrete compressive strength unchanged and improve other properties of concrete.
 
(2) External admixture: The amount of cement remains unchanged, and the addition of microsilica fume can significantly improve the strength and other properties of concrete. When concrete is mixed with silica fume, there is a certain slump loss. This point should be paid attention to during the mix ratio test.
 
Micro-silica powder must be used in conjunction with a water reducing agent. It is recommended to mix fly ash and ground slag to improve its workability.
 
 
 
When preparing concrete with micro-silica fume, the weight ratio to cementitious material is generally:
 
(1) High performance concrete: 5-10%;
 
(2) Hydraulic concrete: 5-10%
 
(3) Shotcrete: 5-10%;
 
(4) Pump aid: 2-3%;
 
(5) Wear-resistant industrial floor: 6-8%;
 
(6) Polymer mortar, thermal insulation mortar: 10-15%,
 
(7) Unshaped refractory castable: 6-8%. Before use, please select a reasonable and economical dosage based on actual needs through experiments.
 
2. Adding method:
 
The micro-silica fume concrete and castable should be made by the laboratory for construction mix ratio. Construct in strict accordance with the mix ratio. In the mixing of micro-silica fume concrete, the micro-silica fume should be added to the mixer immediately after the aggregate is added. There are two procedures for joining:
 
(1) Put in aggregate, then put in micro-silica fume, cement dry mix, and then add water and other additives.
 
(2) Put in coarse aggregate + 75% water + micro silica fume + 50% fine aggregate, stir for 15-30 seconds, then put in cement + admixture + 50% fine aggregate + 25% water, and stir until uniform. The mixing time is 20-25% or 50-60 seconds longer than ordinary concrete. Never add micro-silica powder to the mixed concrete.
 
 
 
3. Construction method:
 
There is no major difference between the construction method of silica fume concrete and ordinary concrete, but it is necessary to organize well and vibrate and compact during construction. The early strength of micro-silica fume concrete will advance the final setting time, so care should be taken when plastering the surface; at the same time, adding micro-silica fume will increase the viscosity of the concrete and greatly reduce bleeding, making it slightly difficult to plaster the surface.

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Time of issue:2020-12-30 17:49:01

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