Interpretation of common steel fiber knowledge1
Fiber is the most basic unit of composition materials. At present, the most common classification of fibers may be textile fibers, but in addition to the textile industry, other industries will also use different fiber materials. For example, this article will introduce a common steel fiber. . The interface between cement matrix and aggregate in concrete is the weak link of concrete. For steel fiber reinforced concrete, the interface between cement matrix and steel fiber is often the weakest link in steel fiber reinforced concrete. The interface between cement stone and steel fiber is bonded. Mainly physical bonding. The so-called physical bonding is caused by the adhesion and mechanical meshing between the cement hydrate and the steel fiber interface. Therefore, the shape, surface condition, cross-sectional shape of the steel fiber and the material of the steel fiber have a great influence on such physical bonding. . At present, the steel fibers that are widely used mainly include the following: (1) Short fibers made by cutting steel wires: the production process of this kind of fiber is relatively simple, the tensile strength of the obtained steel fibers is high, and the disadvantage is that the surface is smooth , so the bond strength with the concrete matrix is low. (2) Sheet shear steel fiber: The production process of this kind of fiber is similar to the first one. The raw material is a thin steel plate with the same width as the required fiber length, and then it is made by shearing, and the steel fiber is slightly bent during the shearing. and twisting, which increases the bond strength. (3) Steel ingot milling steel fiber: using steel ingot as raw material, the fiber is made by cutting with a milling cutter. This fiber is characterized by axial twist, and the surface of the fiber can be roughened by improving the cutter. In addition, the first two The surface of this fiber will be more or less adhered to impurities such as oil stains during the production process, and the production method of this fiber can ensure that its surface is clean. Therefore, the bond strength between the steel fibers prepared by this method and the concrete matrix is higher than that of the first two steel fibers.
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