The technical requirements for bonded steel fibers mainly include the following aspects:
Physical performance requirements:
Strength requirements: The strength of steel fibers is an important indicator of their quality. According to different application fields and needs, different levels of strength requirements can be formulated. Common strength levels include low strength (LS), medium strength (MS) and high strength (HS). When conducting physical performance tests, the steel fibers should be subjected to tensile, torsion and impact tests in accordance with the relevant standards to ensure that they meet the corresponding strength requirements.
Corrosion resistance requirements: Steel fibers may be corroded by chemicals and moisture in the environment during use, so corrosion resistance is also an important consideration. Steel fibers should undergo salt spray tests, acid and alkali erosion tests, etc. to evaluate their corrosion resistance.
Fiber shape and size requirements: The shape and size of steel fibers have an important influence on their dispersion and reinforcement effect in concrete. The shape of steel fibers is usually a steel wire or steel wire bundle with a diameter of 0.2-1.0mm. Specific requirements for different shapes and sizes can be formulated, such as length, diameter, curvature, etc.
Chemical composition requirements:
Main element content: The chemical composition of steel fiber has an important influence on its physical properties and corrosion resistance. Corresponding standards should be formulated to clarify the content range of various main elements (such as carbon, sulfur, phosphorus, etc.) to ensure that the steel fiber meets the corresponding chemical composition requirements.
Impurity content: Impurities refer to other elements or compounds other than the main elements, which will affect the performance of steel fiber to a certain extent. Steel fiber should be tested for impurity content, and corresponding standards should be formulated to clarify the allowable content range of various impurities.
Production process requirements:
Raw material selection: The quality of steel fiber is affected by the raw materials, so high-quality raw materials should be selected for production. The raw materials should meet the corresponding standards and have certain strength and corrosion resistance.
Production process control: In the process of steel fiber production, each link should be strictly controlled to ensure the consistency and stability of the product. Including raw material pretreatment, drawing, cutting and other links need to be strictly controlled, and the corresponding quality management system should be established.
Testing methods and equipment: The quality inspection of steel fiber is an important link to ensure that it meets the technical requirements, and appropriate testing methods and equipment should be used for quality control.