Microsilica Applications, Fields, and Usage Methods

Scope of Application:

Concrete products, high-strength concrete, self-leveling concrete,不定形耐火材料shapeless refractory materials, dry mix (ready-mixed) mortar, high-strength shrinkage-free grout, wear-resistant industrial flooring, repair mortar, polymer mortar, thermal insulation mortar, impermeable concrete, concrete densifier, concrete anti-corrosion agent, cement-based polymer waterproofing agent; reinforcement of rubber, plastics, unsaturated polyester, paints, coatings, and other high molecular materials; modification of ceramic products, etc.

Application Fields:

1. For mortar and concrete applications: high-rise buildings, seaport wharfs, reservoir dams, water conservancy projects, sluices, railways, highways, bridges, subways, tunnels, airport runways, concrete pavements, and reinforced anchoring for coal mine tunnels.

2. In the materials industry:

(1) High-performance low-cement refractory castables and prefabricates, with a lifespan three times that of conventional castables, and a耐火 temperature increase of approximately 100℃, exhibiting significant improvements in high-temperature strength and thermal shock resistance. They are widely used in industries such as coke ovens, iron smelting, steelmaking, rolling, non-ferrous metals, glass, ceramics, and power generation. (2) Large-scale iron troughs and ladle materials, permeable bricks, and coating repair materials, etc.

(3) Self-flowing refractory castable materials and wet/dry spray application.

(4) Oxide-bonded silicon carbide products (ceramic kiln equipment, firebrick, etc.).

High-temperature calcium silicate lightweight insulating material.

(6) Corundum-mullite tiles for electrical porcelain kilns.

(7) High-Temperature Wear-Resistant Materials and Products.

(8) Corundum and ceramic products.

(Silicon Carbine Products. In addition to being widely used in castable refractory materials, they are also extensively applied in electric fusion and sintered refractory materials.)

3. New Wall Materials and Decorative Surfaces:

Insulating polymer mortar, thermal mortar, and primer for wall insulation.

(2) Cement-based polymer waterproofing materials.

(3) Lightweight Insulating Energy-Saving Concrete and Products

(4) Interior and exterior wall putty powder processing.

4. Other Applications:

Silicate brick raw materials.

(2) Produce water glass.

(3) Used as reinforcing material for organic compounds. Due to its similarity in composition to white carbon black produced by the vapor phase process, it can be utilized as a reinforcing filler in high polymer materials such as rubber, resins, coatings, paints, and unsaturated polyesters.

(4) Used as an anti-caking agent in the fertilizer industry.

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2. Method of mixing:

Silica fume concrete and casting materials should be mixed in accordance with the proportions determined by the laboratory. Construction should be strictly adhered to these proportions. During the mixing of silica fume concrete, the silica fume should be immediately added to the mixer after the aggregates are added. There are two procedures for adding the silica fume:

Aggregate is added first, followed by silica fume and dry cement mix. Water and other additives are then incorporated.

(2) Combine coarse aggregate + 75% water + silica fume + 50% fine aggregate, mix for 15-30 seconds, then add cement + admixture + 50% fine aggregate + 25% water, mix until uniform. Extend the mixing time by 20-25% or 50-60 seconds compared to regular concrete. Avoid adding silica powder to already mixed concrete.

3. Construction Method:

Silica fume concrete and regular concrete have similar construction methods, but proper organization and vibration for compaction are crucial during construction. The early strength properties of silica fume concrete can shorten the final setting time, so attention should be paid during finishing. Additionally, the addition of silica fume increases the viscosity of concrete and significantly reduces bleeding, making finishing slightly more challenging.

4. Construction Safety:

Safety in the construction of silica fume concrete should strictly adhere to the national construction specifications for concrete projects. However, due to the light nature of silica fume, it is strictly prohibited to dump materials from heights to prevent the dust from flying.