85% Undensified Silica Fume
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85% Undensified Silica Fume
•SiO₂: >85%
•Color: Light Grey
•PH Value: 5~8.5
•Category: Undensified Silica Fume
•Bulk density: 240-270kg/m³, 320kg/m³
•Packages:25kg plastic woven bags, 500kg plastic woven bags, 600kg plastic woven bags,1000kg plastic woven bags.
Introduction
85% Undensified Silica Fume is a micro silica fume with 85% SIO₂ content, and the Bulk density is 240-320kg/m³.
Silica fume is a byproduct of producing silicon metal or ferrosilicon alloys. It consists primarily of amorphous silicon dioxide (SIO₂), its average granule diameter is 0.15~0.20 μm, specific surface area is 15000~20000 m²/kg. Metal Silicon Powder is mainly used for high transparency, high resistance to tear silicone rubber, silicone grease, sealed packaging materials such as capacitors.
Tags: 85 Microsilica,85U Silica Fume,85 Grade Silica Fume,85% Undensified Silica Fume Archives
85% Undensified Silica Fume Advantages
. Lowers concrete permeability.
. Significantly increases concrete durability.
. Increases ultimate strength gain.
. Beneficial in all types of high-strength concrete applications.
. Improves bond strength to steel.
. Significantly reduces alkali-silica reactivity.
. Provides excellent resistance to sulfate or seawater attack.
. Reduces steel corrosion.
. Improves freeze/thaw durability of concrete.
Please Note:
. In the application of high-strength, high abrasion resistance, underwater casting of anti-scattering concrete, etc., the amount of silica fume admixture should not be too low usually accounting for 5%-10% of the cementitious material.
. Use 85% Undensified Silica Fume preparation of high-strength, early-strength concrete should be used with the high-efficiency water-reducing agent, with high-strength concrete should be selected with the low air-entraining high-efficiency water-reducing agent, depending on the situation can add defoamer.
. In ordinary strength, impermeable, highly durable or self-compacting concrete applications, it is appropriate to use a multi-component cementitious material with low silica fume admixture, usually accounting for 2%-5% of the cementitious material.
. The addition of 85% Undensified Silica Fume needs to extend the mixing time, and can not be mixed in wet concrete after mixing, it is recommended to extend the mixing time to 30 seconds than ordinary concrete to ensure uniform mixing.
. Plastic shrinkage crack sensitive, better maintenance method is: spraying concrete that has not yet set, spraying curing agent maintenance; concrete hardening, the use of maintenance film, covered with wet sacks or plastic film.
85% Undensified Silica Fume Parameters
85% Undensified Silica Fume is produced in conformance with the ISO9001:2008 quality management system. The quality is controlled and monitored throughout the entire production process to ensure that it meets or exceeds specification requirements.
| National Standards for Silica Fume for Concrete | ||||||||||
| National Standards and Organizations | Europe | Norway | France | Australia | United States | Canada | Japan | China | ||
| Standard Code | CEN EN | NS | NF | AS | ASTM C | CSA | JIS | GB/T | GB/T | |
| Standard Number | 13263 | 3045 | P18-502 | 3586 | 1240 | A23.5 | A6207 | 18736 | 27690 | |
| SiO2 % ≥ | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | 85 | |
| SO3 % ＜ | 2 | 2.5 | 3 | 1 | 3 | |||||
| CI－ % ＜ | 0.3 | Report | 0.2 | Report | 0.1 | 0.1 | 0.1 | |||
| CaO % ＜ | 1 | 2 | 1 | |||||||
| MgO % ＜ | 5 | |||||||||
| Si % ＜ | 0.4 | 0.4 | ||||||||
| Na2O+K2O % ＜ | 4 | 1.5 | ||||||||
| C % ＜ | 4 | |||||||||
| Water Content % ＜ | 2 | 3 | 3 | 3 | 3 | |||||
| Burn Vector % ＜ | 4 | 5 | 6 | 6 | 6 | 5 | 6 | 4 | ||
| Specific Surface Area ㎡/g | 15-35 | ≥12 | 20-35 | ≥15 | ≥15 | ≥15 | ||||
| 45μm Sieve Residue % ＜ | 10 | 10 | 5 | |||||||
| Loose capacity kg/m³ | Report | Report | ||||||||
| Specific Gravity g/㎝³ | 2.1-2.3 | Report | ||||||||
| Water Demand Ratio % ≤ | 125 | 125 | ||||||||
| Volcanic Ash Activity Index | %（3d) ≥ | |||||||||
| %（7d) ≥ | Report | 105 | 85 | 85 | 95 | 105 | ||||
| %（28d) ≥ | 100 | 95 | 100 | 115 | ||||||
| Water to Glue Ratio | 0.5 | 0.5 | 0.484 | 0.5 | 0.5 | 0.5 | ||||
| Conservation | Standard | Standard | Accelerated | Accelerated | Standard | Standard | Accelerated | |||
85% Undensified Silica Fume Application
Concrete, Refractory, High Performance Concrete, Oil and Gas Industry, Ceramics, Concrete Roofing, Wall boards, Cementation Repair Products, Concrete Tile & Panels, FCB, Shotcrete, Polymers & Elastomers and (SCC) Self-Compacting Concrete.
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.
85% Undensified Silica Fume Packaging
- 25kg soluble paper bags x 42 on the pallets.
- 500kg plastic woven bags x 2 on the pallets(with or without bottom spout)
- 600kg plastic woven bags x 2 on the pallets(with or without bottom spout )
- 1000kg plastic woven bags x 2 on the pallets(with or without bottom spout )
Ewende offers a range of Metallurgical Silicon Powders that are carefully selected and crushed to customer specifications and needs. Different purities, specifications and chemistry are therefore available, to satisfy customer processing requirements and application needs. Industrial Silicon Powders with customized chemistry and sizing can be produced on request.
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