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Application of Microsilica Fume in Concrete and Cement Industry

Application of Microsilica Fume in the concrete industry

Concrete mixed with micro-silica fume has the characteristics of high strength, good adhesion, and cohesion properties, and can increase the molding thickness. In water conservancy and hydropower projects such as long-span bridges and offshore oil drilling platforms, microsilica fume concrete can improve its anti-seepage, anti-corrosion, and anti-abrasion properties. During road construction, microsilica fume can greatly improve the early strength and wear resistance of concrete.

In addition, the effect of microsilica dust on the properties of rapidly hardening polymer-modified concrete. The results show that the strength of concrete increases with the increase of silica fume content. When 4% silica fume is contained, the strength reaches the maximum value. When 10% silica fume was mixed into inorganic mineral polymer concrete, it was found that the tensile strength, compressive strength, and flexural strength of the concrete increased by 12.8%, 6.9%, and 11.5% respectively. Research shows that with the incorporation of micro-silica fume, the compressive and tensile strengths and elastic coefficients of energy-saving concrete gradually increase.

Adding microsilica fume can prevent the decrease in the tensile strength of lightweight concrete at high temperatures. Mixing microsilica powder into concrete can effectively improve the concrete’s impermeability, impact resistance, crack resistance, wear resistance, fatigue resistance, and other properties. Adding silica fume can compensate for the shrinkage of bridge concrete, thereby improving the density of the concrete and strengthening its anti-cracking and impermeability properties. Microsilica fume can be better dispersed between the particles of precast box beam concrete, increasing the density of concrete. As the content of microsilica fume increases, the loss of early-aged concrete in acidic media decreases, while the loss in alkaline media remains unchanged.

Microsilica fume can improve the compressive, tensile, impact strength and wear resistance of concrete. This is because silica fume does not participate in the curing reaction, which improves the bonding strength and compactness between the components in the concrete and weakens the harm of Ca(OH)2. Microsilica powder and resin are easy to mix and difficult to agglomerate, which can effectively reduce precipitation and stratification. Microsilica dust can reduce the expansion and contraction rate of concrete and has good insulation and arc resistance properties for concrete. Generally speaking, concrete mixed with silica fume does not react chemically with most acids and alkalis, thereby enhancing the corrosion resistance of concrete.

Microsilica Fume as a Cement Blending Material

Some foreign countries use microsilica fume as an admixture for cement production. Canada requires that in cement mixed with microsilica fume, the silicon content in the microsilica fume should be >85%, while the burning loss should be <6%. In addition, the Soviet Union, the United States, Japan and other countries also use microsilica fume as a blending material to produce special cement. Special cement mixed with silica fume can be made into dense concrete with a strength of 2 to 3 times that of ordinary concrete. It has good wear resistance, corrosion resistance, impermeability, insulation, frost resistance and resistance to chloride ions. Blocking performance, etc.

The impact of cement and microsilica fume precast panels on the engineering performance of peat block floors was analyzed using the finite element method. The stress distribution of the precast panels and peat floors was analyzed. The results showed that the precast panels can significantly improve the strength and load-bearing capacity of soft peat floors. silica fume and polypropylene fiber are mixed into cement. The results show that mixing them can increase the strength, crack resistance, compactness, and durability of cement, but the water absorption and volumetric quality of cement will decrease. The effects of bentonite, fly ash and microsilica fume cement slurry on the uniaxial compressive strength of the matrix at 7, 14, and 28 days respectively. Research shows that silica fume is the most effective parameter index to improve the uniaxial compressive strength of the matrix.

The strength of cement increases significantly with the increase in the content of microsilica fume. Microsilica fume can effectively improve the compactness and secant elastic modulus of cement, and significantly improve the corrosion resistance and creep properties of cement. However, the water absorption rate of cement and Volumetric quality will be reduced. Therefore, when incorporating silica fume into cement, attention should be paid to the reduction of water absorption and volumetric mass.

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