Silica fume is an excellent material with broad application prospects at home and abroad. It has been widely used in water conservancy, electric power and other industries, and is often used in the design of modern high-speed railway. Used in cement or concrete to improve the performance of cement or concrete, prepared with ultra-high, wear-resistant, erosion-resistant, corrosion-resistant, permeable, frost-resistant, early strength special concrete or composite cement, to adapt to the harbor, railway bridges, expressways, airport runways, tunnels and high-rise buildings in the city and other special requirements projects, can effectively improve the strength and durability of products.
1. Micro silica fume concrete can improve the anti-abrasion ability of the project. The traditional anti-abrasion materials at home and abroad use epoxy mortar and other macromolecule materials. Although the anti-abrasion ability is good, its linear expansion coefficient is several times higher than that of the ordinary concrete on the base, which is not well adapted to the temperature of the concrete on the base, and it is tolerant in the natural climate. It is easy to crack and fall off, and the construction is complex, toxic, expensive, and can not be widely used. When using microsilica fume concrete, the anti-erosion and anti-abrasion ability can be improved about one time, and the anti-abrasion ability for 48m/s velocity class can be improved more than three times.
2. micro silica fume concrete can improve the crack resistance of the project. Concrete cracks have become a major concern. The reason for the crack is that the hydration heat of the material itself increases temperature, such as adding fly ash in concrete, although it can reduce the electrothermal heating, but the early strength is relatively low, so that the amount of fly ash is limited.
3. micro silica fume concrete can improve the anti permeability and salt corrosion resistance, and protect the steel bar. In underground engineering, chloride ion penetrates into concrete, which causes steel bar corrosion, concrete delamination, short service life and serious destruction. Underwater concrete is usually poured by duct method. Because of the loss of cement slurry, it can not bond well with the base layer, and reduce the strength of the water contact part. After adding silica fume into underwater concrete, these problems can be obviously improved.
4. silica fume concrete has very strong wear resistance in the rush repair of highway pavement. It takes 28 days for ordinary concrete to be poured into roads and 3 days for early-strength concrete to be poured into roads. Damage to concrete road surface is inevitable. Traffic disruption often results in serious economic losses when repaired by conventional methods. The application of micro silica fume concrete with early strength and wear resistance is very ideal.
Because of its fine fineness, high activity and high purity, silica fume has been gradually used in many fields. As a new product, silica fume will be widely used in highway, bridge and tunnel engineering in the future.