Densified silica fume is the most common type of silica fume used by concrete manufacturers, divided into Grade 85D, Grade 90D, Grade 92D, Grade 94D and Grade 95D. It is widely used in various concrete construction projects.
What Is Densified Silica Fume?
Densified silica fume is a refined and enhanced form of microsilica, obtained from the production of silicon metals and alloys. Through a specialized process, the particles of silica fume are densified, resulting in increased bulk density and improved flowability. This densification enhances its performance in various applications, such as high-strength concrete, shotcrete, and refractory materials, offering superior mechanical properties and durability for construction and engineering projects.
Densified Silica Fume Advantages
①Cost Reduction-The smaller the size of the product, the lower the price of transportation. And since densified silica fumes are in a compressed state, there is a reduction in the product’s cost of shipping or transportation.
②Dust Reduction-The densified state of the silica fume ensures that there is less dust during its use. The dustless nature of the silica fume creates a better working environment for workers. This makes them safe from the health risks involved in constantly inhaling the dust of silica fume.
③Easy mechanical pumping which enables great stirring-The compactibility of the silica fume plays a role in allowing for easier mixing as little quantity can be used for a large mix. It is particularly suitable for mechanical pumping, which is great for stirring.
The cluster effect of densified silica fume in the hardened pulp is obvious, and there are obvious cracks in some silica fume clusters, which increase the total porosity of the pure slurry and reduce the compressive strength of the clean slurry, which requires sufficient stirring Dispersion; dense silica fume in the concrete system, because the coarse aggregate is added first, it has a strong friction effect, after being broken up by a high-power mixer, there are fewer clusters and can be relatively well dispersed, and the silica fume The volcanic ash reaction plays a role in improving the interface transition zone, which increases the compressive strength of concrete. Contact us for details!
♦Refractories: Densified Silica Fume is commonly used in castable, sintered, and fused refractories. For example, it can be used in high-performance, high-grade, and low-cement refractory castables and prefabricated parts, air-permeable bricks, large-scale iron trenches and ladles, and more.
♦Mortar and concrete: Densified Silica Fume can also be used for harbor wharves, high-rise buildings, railway bridges, reservoir dams, concrete pavement, and more.
♦Protective coatings: Nano-silica sol serves as an active material for fire protection, environmental protection, and anticorrosive coating.
♦Wall and decorative materials: Densified Silica Fume can also be used for thermal insulation mortar, polymer mortar, and as an interface agent for wall insulation.
♦Putty: Microsilica can be used in putty powder for exterior and interior wall insulation.
♦Filling and reinforcement: Densified Silica Fume is also used as filling and reinforcing materials in resin, rubber, paint, unsaturated polyester, and more.
♦Additives: Finally, Densified Silica Fume is commonly used as an additive in other active areas.
The high resistivity and low permeability of micro-silica sprayed concrete in the project can reduce the corrosion of steel bars and wire mesh by chlorides, reduce the amount of rebound, reduce permeability, and improve the durability of freezing and thawing. Improved bending and compressive strength.
Micro silica fume can be used as a binder, active agent and mineralizer for refractory materials and kiln furniture materials, which is conducive to improving the solid-phase reaction and sintering driving force of refractory materials, enhancing the reaction speed and sintering density of materials, and is conducive to crystal transformation. performance of the material.
Using silica fume as the main raw material to prepare composite silicate thermal insulation materials has gradually become a hot spot in the application of silica fume. Composite silicate thermal insulation coating is one of the most widely used thermal insulation coatings at present. It belongs to barrier type thermal insulation coating.
Silica fume can improve the performance of concrete mixture, reduce air bubbles on the surface of concrete, improve the strength of concrete surface, make the surface of concrete smooth, inhibit the carbonation of concrete, resist the erosion of harmful external media, and help improve the durability of concrete. help improve the durability of concrete.
By adding micro silica fume, optimizing concrete mix ratio, temperature control and other technical means, the PHC pipe pile can be realized without high-pressure steam curing and energy-saving technology, which not only simplifies the process, but also greatly reduces coal and electricity consumption, and also reduces carbon dioxide. emission.
Concrete mixed with silica fume is mainly used in water cushions, ponds, flood discharge tunnels and other parts. As an auxiliary cementitious material, microsilica fume can significantly improve the strength of cement stone in the concrete matrix, and at the same time greatly improve the relationship between cement stone and aggregate. between the bond strength.
Adding micro silica fume to oilfield cement can improve the thermal stability of oilfield cement, change the C/S ratio of cement, and change the composition and structure of cement hydration products. With the addition of different amounts and ambient temperatures, it can be obtained A series of hydration products with good stability, high strength and low permeability.
There is no fine sand in the permeable concrete, and the porosity is relatively large. A small change in the water-cement ratio of the blank sample can cause a large change in the fluidity of the mixture. The water-cement ratio is difficult to control, and the water-cement ratio can be significantly improved by adding silica fume. workability of fresh concrete mixtures.
Micro silica fume is used in high-grade high-performance low-cement refractory pouring materials and prefabricated parts. The service life is three times that of ordinary castables, the refractoriness is increased by about 100°C, and the high-temperature strength and thermal shock resistance are significantly improved. It has been widely used in ceramic industries.
Micro silica fume is used for agricultural fertilizer and improved soil varieties. Micro-silica fume is mixed with potassium hydroxide or potassium carbonate and heated to make potassium silicate slow agricultural fertilizer. It is not easy to volatilize and lose, can protect the soil, promote the development of crop roots, and inhibit pests and diseases.
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