What are the benefits of adding silica fume to concrete?
Aug 06, 2024
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1, concrete silica fume to manufacture high grade concrete (C70 and above), significantly improve the strength and pumping performance of concrete.
2, manufacture of high impermeability (≥P30), structural self-waterproof concrete, used in subways, tunnels, basement of high-rise buildings.
3. Reasonable particle size distribution of silica fume, strong density, high hardness, good wear resistance, can greatly improve the tensile, compressive, impact strength and wear resistance of the cured material, and the impact resistance can be increased by 0.5-2.5 times.
4, silica fume can increase the thermal conductivity, change the adhesiveness and increase the flame retardant performance.
5, can reduce the exothermic peak temperature of epoxy resin curing reaction, reduce the linear expansion coefficient of the cured material and the shrinkage rate of the cured material, so as to eliminate internal stress and prevent cracking.
6, due to the fine particle size of silica fume, reasonable distribution, can effectively reduce and eliminate precipitation, stratification phenomenon.
7, the silica fume is pure, the impurity content is low, the physical and chemical properties are stable, so that the cured material has good insulation properties and arc resistance.
8, the manufacture of Marine and chemical concrete, due to the high density of concrete silica fume, effectively prevent sulfate and chloride ions on the concrete penetration, erosion, to avoid the corrosion of concrete reinforcement, thereby extending the life of concrete.
9, the chemical composition of silica fume is silicon dioxide (SiO2), is an inert substance, and most acids, alkali can not react chemically, silica fume evenly distributed, covered on the surface of the object, with strong corrosion resistance, anti-erosion ability increased by 3-16 times.
10. The packing density of silica fume is small: one is between 0.2-0.8 and one is between 1.0-2.2. As a polymer filling material, less than other mineral fillings, small loading weight, saving the amount of polymer, so it can reduce the cost of products.
11. Freezing resistance of silica fume: after 300-500 rapid freezing cycles, the relative elastic modulus of silica fume is 10-20% lower, while ordinary concrete passes 25-50 cycles, and the relative elastic modulus is 30-73% lower. Therefore, the frost resistance of concrete can be improved.
12. silica fume early strength: silica fume concrete shorens the induction period and has the characteristics of early strength. These features are all good!
13, silica fume in water conservancy, highway, bridge engineering projects, concrete not only needs the above basic indicators, but also has very demanding requirements for wear resistance and erosion resistance, and it is necessary to incorporate silica fume into concrete.
14, silica fume has strong activity, with water reducing performance, suitable for rapid construction needs of early strength, high strength concrete admixture; The admixture of high-strength shotcrete used for support in the construction of tunnel, subway and large foundation pit structure; Admixtures of concrete used in underwater construction projects (e.g. piers, DAMS, drilling platforms, etc.).
