What are the methods to prevent steel fibers from rusting?

Steel fiber is a new type of concrete composite material that has developed rapidly in recent years and is widely used. Adding a small amount of steel fiber to the concrete matrix can qualitatively change the physical and mechanical properties of concrete and greatly improve the crack resistance and impact resistance of concrete. sex and tolerance. It is the transformation of concrete from traditional low tensile brittleness data to high strength tolerance data, so it can be widely used in concrete layout projects such as civil engineering, tunnels, water conservancy, transportation, mining, metallurgy, ports, etc.

The application of steel fiber concrete can not only make up for the brittleness of traditional building materials, but also improve various skills and policies, optimize project quality, and save a lot of steel bars, cement and manpower. In addition, the operation method has become simpler and more convenient, which greatly reduces the total cost of the project while ensuring the quality of work arrangements. At present, steel fiber is widely used in highway pavements, bridges and other projects in my country, and is used in floor slabs, housing construction projects, etc. It is also used in waterproof roofing, prestressed layout components and other parts.

So what are the methods to prevent steel fibers from rusting?
After steel fiber reinforcement, it can control the opening of cracks, transfer tensile stress, and redistribute stress, thereby improving the post-crack strength of concrete and giving concrete appropriate bending toughness. Compared with plain concrete, concrete has lower tensile strength and is prone to cracking. brittle failure will occur later. Steel fiber concrete can still bear load after deformation.
The surface of the steel fiber must not be greasy, plated with harmful substances and other impurities or soil layers that affect the bonding of the steel fiber to the concrete. The total weight of the adhesive sheet, steel fiber with severe corrosion on the surface, rust powder and impurities contained in the steel fiber must not exceed 3% of the total weight of steel fiber. When using steel fiber, check the quality of the excavation section before spraying, deal with over-excavation and under-excavation, and ensure that the material meets the specifications or planning requirements. Clean the rock surface before spraying. The sprayed concrete support should be closely combined with the surrounding rock, and the combination should be firm. There should be no gaps. The sprayed layer should not add flakes, wood and other debris. If necessary, a cohesion test should be performed.