- Chinese Trustworthy Manufacture of Silica Fume
Silica fume use for shotcrete delivers greater economy and time savings and is a more efficient use of sprayed concrete. Silica fume produces superior shotcrete for use in rock stabilization, mine tunnel linings, and rehabilitation of deteriorating bridge and marine columns and piles. Greater bonding strength ensures an outstanding performance of both wet and dry process shotcrete applications, with less rebound loss and thicker product applications.
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.
Micro-silica fume is a high-performance mineral admixture with volcanic ash, which is mainly used to improve the strength and durability of concrete and can replace micro-silica fume Portland cement. The performance of dry-mix and wet-mix shotcrete can be greatly improved by using micro silica fume, such as the application in rock mass stability, tunnel lining and underground structure repair, and excellent performance can be obtained.
Silica-fume Shotcrete – delivers greater economy, greater time savings and more efficient use of sprayed concrete. Silica fume produces superior shotcrete for use in rock stabilization, mine tunnel linings, and rehabilitation of deteriorating bridges and marine columns and piles. Greater bonding strength assures outstanding performance of both wet and dry process shotcreting with less rebound loss and thicker applications with each pass of the shotcrete nozzle. Some performance characteristics are:
• Reduction of rebound loss up to 50%
• Improved production time, with one-pass application thicknesses up to 12 inches
• Higher bonding strength
• High electrical resistivity and low permeability
• High compressive and flexural strengths
Through the use of silica fume, the performance of shotcrete and production technology can be improved as follows.
1. In the dry mix of shotcrete to reduce the amount of rebound, thereby improving the economic efficiency of the material.
2. Increased single-layer shotcrete thickness on top and vertical surfaces without the use of set promoters, thus improving production efficiency.
3. When repairing piles and breakwaters in tidal areas, it can improve the cohesion and scouring strength of piles and dikes.
4. Improved freeze-thaw durability due to reduced permeability.
5. Early and late flexural and compressive strength of shotcrete are improved.
6. Increased resistance to chemical attack by chlorides, nitrates, sulfates, acids and alkali-aggregate reactions.
7. In concrete repair work in chloride environment, the high resistivity and low permeability of silica fume shotcrete mitigates reinforcing steel and wire mesh
corrosion.
Shotcrete is a mixture of cement and aggregate mortar or concrete. Shotcrete is sprayed on surface at high speed with compressed air. There are two basic construction methods for shotcrete: wet mixing and dry mixing. In these two construction methods, silica fume additives are easy to add.
The construction method of dry mixed silica fume is as follows:
1. A super-large bag mix of fiber pre-mixed with cement, aggregate and microsilica powder, usually weighing 1000kg.
2. Micro-silica fume, cement and aggregate are dry-mixed into transport mixer in the factory, and silica fume and explosion-proof fiber are put into the transport mixer.
3. use the weight standard volume ratio at the construction site, add bagged silica fume or mixed cement.
4. add micro silica powder slurry into the nozzle.
In wet mix construction, the methods of adding silica fume are as follows:
1. Transport mixtures, just like ready-mixed concrete, with cement, admixtures and aggregates, in the central mixing plant or dry mixing plant add micro-silica fume by volume ratio.
2. transporting concrete from ready mixed plant, the microsilica powder is placed in bags.
3. add slurry to batch feeding equipment.
Dry mix shotcrete is best used in the following situations:
1. It is difficult to provide wet-mix shotcrete when the site is far away or difficult to approach, such as in some mines application and repair offshore structures.
2. A small amount of shotcrete should be provided periodically, such as for repairing busy roads or railway tunnels.
In recent years, wet shotcrete has been widely used. Compared with dry shotcrete, wet shotcrete has the following advantages:
1. The ratio of water-cement can be well controlled by the plant ingredients. In the dry mixing construction, the ratio of water to cement is controlled by the workers who master the nozzle.
2. less springback, higher injection rate and higher productivity, thus reducing the cost.
3. mixing with less dust and greater uniformity.
Three kinds of micro silica fume products are used in wet mixing and dry mixed concrete:
(1) non densified silica fume; (2) densified low density micro silica fume; (3) densified high density silica fume.
In the mix proportion design of Silica fume (minecrete) shotcrete, the average dosage of silica fume is 13% (according to the quality of cement). Dry-mix shotcrete does not require superplasticizers, because most of the water in the mixture is added into the nozzle, and the contact time between water and cement, silica fume is too short to effectively reduce water before the mixture is actually consolidated on the surface.
We are a comprehensive enterprise integrating R&D, production, sales and operation of silica fume powder, which can independently complete product production and equipment inspection, we can meet the different needs of different customers in different industries.
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