properties and functions of microsilica-pg电玩城

microsilica (or silica fume) is amorphous, powdered sio2 collected by specially designed dust collector after the oxidization of silicon steam emitted by flue during the smelting of ferro-silicon alloy or industrial silicon. with an average particle size of 0.15~0.20 crystalline m and a specific surface area of 15,000 ~20000m 2 /kg, the microsilica has a strong surface activity.

the main component of microsilica is amorphous silica, and the rising furnace gas also contains impurities, such as free c, fe2o3, cao, k2o, na2o and so on. the color of microsilicachanges from white, grey to grey and deep grey as c and fe2o3 content increases.

the microsilica directly after dust collection is called raw ash, whose bulk density is 150~300kg/m3. for the convenience of transportation and engineering application, the original ash can also be encrypted.

the properties of microsilica are mainly shown in two aspects: volcanic ash activity and microparticle property. therefore, microsilica is mostly used as filler and modified additive.

used for high performance concrete, improve concrete strength, performance and extend concrete life

used for refractories, enhance fluidity, reduce water consumption, improve product strength and durability

used for dry powder mortar, grouting material, improve early strength

used for wear-resistant floor, increase fluidity and improve abrasion resistance

used for paint, paint, resin, rubber and other polymer material filler

the performance of microsilicain high performance concrete

at present, in order to improve strength and durability, it is widely accepted to add microsilica to high-performance concrete used in national infrastructure construction. the high-performance concrete with micro-microsilica shows strong toughness, high anti-freezing ability, anti-wear ability and anti-chemical corrosion ability, which extends the service life of the building and greatly saves the maintenance and overhaul cost in the later period. in recent years, the collapse of some of the country's bridges and marinas is common, mostly due to the serious erosion of their reinforced concrete by seawater. the addition of microsilicacan solve this problem well.

chloride ions and sea water can be reduced for the erosion of concrete

this allows the concrete to have a very high resistivity

the wear resistance of buildings such as airstrips, aircraft carrier decks and highways can be improved

it can have strong resistance to chemical corrosion

the performance of microsilicain high strength concrete

adding microsilica to high strength concrete allows the designer and builder of the project to make more creative choices. for example, the use of high strength concrete with micro-microsilica can avoid excessive pillars in the design of super high-rise buildings to increase the building use space, and the addition of micro-microsilica can preform prestressed beams with larger span.

the compressive strength of concrete can be increased to 140mpa

the elastic modulus of concrete can be as high as 40,000mpa

the flexural strength of the runway can reach 14 mpa in 28 days

the higher early strength can be applied to the shock project and prefabricated parts

 the performance of microsilicain shotcrete

the shotcrete with microsilica is mainly used for solid rock engineering, lining of mining tunnel, vertical column of marine engineering project, etc., which has good adhesion. it can not only be constructed in dry and wet environment to reduce rebound, but also has a fineness suitable for various nozzles, making the construction of shotcrete more economical, more time saving and more effective.

the spray-concrete rebound loss can be reduced by up to 50%

can improve the efficiency of construction, a spray layer thickness up to 12 inches

can have higher bond strength

can have higher resistivity and lower permeability

can have higher compressive strength and flexural strength

application in refractory industry

as a new raw material, microsilica is widely used in refractory industry. it plays an important role in the improvement of amorphous refractories, as follows:

in traditional refractory materials, there are many pores, and the micromicrosilicais filled in the pores, which can increase the volume density and decrease the porosity, and the strength can be obviously enhanced

micromicrosilicahas strong activity, can form colloid particle in water, add right amount dispersant, can enhance fluidity, improve pouring performance thereby

the microsilica is easy to form - si-oh group in water and has strong hydrophilicity and activity. it can enhance the agglomeration of refractory materials, improve the high temperature performance and extend the service life of refractory products

substitute pure aluminum oxide mud for refractory, saving cost

other applications of silica powder

it is applied to cement industry, which is similar to concrete additive material. at present, some countries have been developing the application in this field, developing various kinds of mixed cement, and the quality is better than ordinary cement.

as a anti - caking agent for fertilizers

as the raw material of silicate brick

using silica dust to make resin and other polymer organic compound main polymer products, and used as black, white carbon black, talc, asbestos, gas solvent and other substitutes as additive materials