Silica fume

 

1. Scope of application of silica fume:

Commercial concrete, high-strength concrete, self-leveling concrete, unshaped refractories, dry-mixed (ready-mixed) mortar, high-strength non-shrinkage grouting material, 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.

 

2. Properties:

1. Good insulation: Due to the high purity of silicon powder, low impurity content, stable performance and excellent electrical insulation performance, the cured product has good insulation performance and anti-arc performance.

2. It can reduce the exothermic peak temperature of epoxy resin curing reaction, reduce the linear expansion coefficient and shrinkage rate of the cured product, so as to eliminate the internal stress of the cured product and prevent cracking.

3. Corrosion resistance: Silicon micropowder is not easy to react with other substances, and has no chemical reaction with most acids and alkalis. Its particles evenly cover the surface of the object and have strong corrosion resistance.

4. Reasonable particle gradation can reduce and eliminate the phenomenon of precipitation and delamination during use; it can enhance the tensile and compressive strength of the cured product, improve the wear resistance, and can increase the thermal conductivity of the cured product and increase the flame retardant. performance.

5. Silicon powder treated with silane coupling agent has good wettability to various resins, good adsorption performance, easy mixing, and no agglomeration.

6. Silicon micropowder is used as a filler and added to the organic resin, which not only improves the properties of the cured product, but also reduces the cost of the product.

 

3. How to use silica fume and matters needing attention:

1. Dosage: generally 5-10% of the amount of cementitious materials. The doping method of silicon powder is divided into internal and external doping.

(1) Internal mixing: On the premise of the same amount of water added, 1 part of silica fume can replace 3-5 parts of cement (weight) and keep the compressive strength of concrete unchanged and improve other properties of concrete.

(2) External admixture: the amount of cement remains unchanged, and the addition of silica fume can significantly improve the strength and other properties of concrete. There is a certain slump loss when concrete is mixed with silica fume. This point needs to be paid attention to in the mixing ratio test.

Silica fume must be used in conjunction with water reducing agent, and it is recommended to mix fly ash and finely ground slag to improve its workability.

 

4. Packaging, storage and transportation of silica fume products:

1. This product is packaged in a laminated plastic woven bag. The packaging specifications are: 850kg/bag, 30kg/bag, 25kg/bag, etc.

2. This product should be stored in a dry, rainy and shaded environment. The product loses its agglomeration activity in contact with water. Prohibit prolonged exposure in the sun to avoid weathering of the packaging bag and spilling of the product.

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