Application of microsilica fume in concrete industry
May 24, 2024
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Concrete mixed with microsilica 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.
CHOI et al. studied 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. MEMON et al. mixed 10% microsilica fume into inorganic mineral polymer concrete and found that the tensile strength, compressive strength and flexural strength of the concrete increased by 12.8%, 6.9% and 11.5% respectively. Research by KIM and others has shown that with the incorporation of microsilica fume, the compressive and tensile strengths and elastic coefficients of energy-saving concrete gradually increase.
TANYILDIZI et al. proved that adding microsilica fume can prevent the decrease in the tensile strength of lightweight concrete at high temperatures. Gao Huiting and others mixed silica fume into concrete, which effectively improved the concrete's anti-permeability, impact resistance, crack resistance, wear resistance, fatigue resistance and other properties. Liu Wenshen proved that adding microsilica fume can compensate for the shrinkage of bridge concrete, thereby improving the density of the concrete and strengthening its anti-cracking and impermeability properties. Guan Yao proved that microsilica powder can be better dispersed between the particles of precast box beam concrete, increasing the density of concrete. SHETTI et al.'s research results show that as the content of microsilica fume increases, the loss of early-aged concrete in acidic media decreases, while the loss in alkaline media remains basically unchanged.
Microsilica fume can improve the compressive, tensile, impact strength and wear resistance of concrete. This is because microsilica fume does not participate in the curing reaction, which improves the bonding strength and compactness between the components in 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 microsilica fume does not react chemically with most acids and alkalis, thereby enhancing the corrosion resistance of concrete.
