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What Are The Benefits of Adding Silica Fume to Concrete?

Concrete pouring

Silica fume is a volcanic ash high performance mineral admixture, which can fill the pores between cement particles, and at the same time generate gel with hydration products, and react with alkaline material magnesium oxide to generate gel. In cement-based concrete, mortar, concrete, exterior wall insulation, grout and refractory casting materials, mixed with the right amount of silica fume, what exactly are the benefits? Silica fume supplier – Henan Superior Abrasives to introduce to you.

1. Improve pumping performance 
Silica fume makes high-strength concrete ( C70 or above), which significantly improves the strength and pumping performance of concrete.

2. Production of high permeability type concrete
Manufacture of high impermeability (≥ P30 ), structural self-waterproof concrete, used in subways, tunnels, high-rise buildings in the basement.

3. Enhance the wear resistance of concrete
Silica fume particle size distribution is reasonable, dense, hardness, good wear resistance, can significantly improve the curing of tensile, compressive, impact strength and wear resistance, impact resistance can be increased by 0.5-2.5 times.

4. Change the adhesive property
Silica fume can increase the thermal conductivity, change the adhesion and increase the flame retardant properties.

5. Prevent cracking
It can reduce the exothermic peak temperature of epoxy resin curing reaction, reduce the linear expansion coefficient of the cured material and the shrinkage rate of the cured material, thus eliminating the internal stress and preventing cracking.

Adding Silica Fume to Concrete

6. Reduce and eliminate precipitation
Due to the fine particle size and reasonable distribution of micro-silica powder, it can effectively reduce and eliminate the precipitation and delamination phenomenon.

7. Good insulation performance
Silica fume is pure, low impurity content, stable physical and chemical properties, so that the cured material has good insulation properties and anti-arc performance.

8. Extend the life
Manufacture of marine and chemical concrete, due to its high dense properties, effectively prevent the penetration of sulfate and chloride ions on the concrete, erosion, to avoid corrosion of concrete reinforcement, thereby extending the life of concrete.

9. Improve anti-cavitation ability
The chemical composition of silica fume is silicon dioxide (SiO2), which is an inert material and does not react chemically with most acids and alkalis. The silica fume is evenly distributed and covered on the surface of the object, which has a strong anti-corrosion ability and increases the anti-cavitation ability by 3-16 times.

10. Cost reduction
Micro-silica powder has small stacking density: one between 0.2-0.8 and one between 1.0-2.2. As a polymer filler material, it is less than other mineral fillers, and the loading weight is small, saving the amount of polymer, so it can reduce the cost of the product.

11. Micro-silica powder frost resistance
After 300-500 cycles of rapid freezing and thawing, the relative modulus of elasticity of microsilica powder is 10-20% lower than that of ordinary concrete, which is 30-73% lower than that of ordinary concrete through 25-50 cycles. Therefore, it can improve the frost resistance of concrete.

12. Silica fume early strength
Micro-silica powder concrete makes the induction period shorten and has the characteristics of early strength. These characteristics are very good.

13. Extremely strong activity of silica fume
With water-reducing properties, it is suitable for early-strength and high-strength concrete admixture needed for rapid construction. Admixture for high-strength shotcrete used for support during the construction of tunnels, subways and large pit structures. Admixture for concrete used in underwater construction projects (such as: bridge piers, dams, drilling platforms, etc.).

Now, I believe you have understood why you need to add silica fume in concrete, silica fume in water conservancy, highway, bridge projects, concrete not only need the above basic indicators, but also on its wear resistance, scouring resistance has very demanding requirements, mixed with micro-silica powder is very necessary. Showing the superior physical properties of silica fume concrete at the same time, but also economic, cost-effective and other advantages, attracting the attention of a large number of concrete manufacturing enterprises.

Henan Superior Abrasives Import & Export Co., Ltd has more than 20 years experience in silica fume production, if you have any questions and demands about micro silica powder, welcome to contact us through  sales@superior-abrasives.com email, we will reply to you as soon as possible.

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