What Is Steel Fiber? What Is Steel Fiber Reinforced Concrete

What is steel fiber?

Steel fiber is a type of metal short fiber with a length of 3-6 centimeters, which can be evenly distributed in concrete and play a reinforcing role.

Steel fiber is a metal substrate that is stretched by external force at room temperature, causing it to become thinner, longer, and undergo plastic deformation. The phenomenon of internal grain slippage and entanglement generates residual stress inside the material, thereby significantly improving the tensile strength of the material. According to experimental data, the tensile strength of stretched steel wire materials can be increased by 230% -730%. In addition, steel fiber materials can effectively improve the bonding strength with the substrate by stamping with end hooks on both sides.

What is steel fiber reinforced concrete?

Steel fiber reinforced concrete effectively improves the shortcomings of ordinary concrete such as low tensile strength, low ultimate elongation, and brittleness, making it have excellent properties such as tensile strength, bending resistance, shear resistance, crack resistance, fatigue resistance, and high toughness.

Steel fibers can limit the formation of cracking and micro cracks caused by early hydration heat in concrete, as well as the development of macro cracks under external loads.

In the early stage of steel fiber reinforced concrete under stress, the components are in the stage of elastic deformation. At this point, steel fibers can bear forces together with concrete, and external loads are mainly borne by concrete. With the continuous increase of external loads, when micro cracks expand to a certain extent, concrete exits work, and steel fibers become the main load-bearing element of external forces. The steel fibers crossing the cracks greatly limit the further expansion of concrete cracks.