Steel fibers are defined in ASTM A820 as pieces of smooth or deformed fibers that are sufficiently small to be dispersed at random in a concrete mixture. ASTM A820 steel fibre reinforcement designates tensile requirements, dimensions and permissible variations. There are mainly 4 steps for steel fibers based on our production process:
For the same mixing and construction, there is no need to add equipment or increase the construction cost of metal fibers for concrete due to the low steel fibre cost.
Under the same strength requirement, metal fibers for concrete can replace steel mesh and reduce the pouring thickness of concrete by 15-25%.
Improve the construction conditions, mixing vehicles and construction personnel can reach the site directly, and shorten the construction period by 30%. Steel fiber reinforced concrete has high tensile strength, which can prolong the distance between contraction joints and facilitate continuous and rapid pouring of concrete.
Convenient construction, saving labor, greatly shortening the construction period and saving the total steel fibre cost.
The working principle of steel fibers for concrete reinforcement involves reinforcing the concrete matrix in three dimensions using steel fibers. These metal fibers, with their specific tensile strength, aspect ratio (length/diameter), and anchorage, play a crucial role in enhancing concrete performance.
By being distributed throughout the concrete, steel fibers effectively restrain the formation of micro-cracks and help redistribute the accumulated stress resulting from applied loads and shrinkage. When cracks do occur, the steel fibers intercept them promptly and inhibit their growth, significantly reducing the likelihood of further crack propagation. This proactive approach ensures that the concrete remains strong and durable, minimizing the risk of structural failure.
Fiber reinforced concrete is comprised of hydraulic cements containing fine and course aggregatea and fiber. A super-plasticizer is ofter used to enhance the mix workability. Fiber products are available in a variety of types and sizes. The underlying principle however on all fiber reinforced concrete is to provide discoutinuous reinforcement and effective crack control.
Fibers reinforce in three fimensions throughout the entire concrete matrix. Fiber performance is based on the combination of the tensile strength, aspect ratio(length/diameter)and anchorage. the distributed fibers resrain micro-cracking and redistribute accumulated stress caused by applied loads and shrinkage. The earlier a crack is intercepted and its growth inhibited, the less chace it will have develop.
Types of steel fibre including：1.Straight 2.hooked 3.Crimped.4.Double duoform 5.ordinary duoform 6.paddied 7.enlarged ends 8.irregular 9.indented.
Macro synthetic fibers are intended to carry a load and therefore, can be used to replace traditional reinforcement. Typical applicationss are: slabs on ground, shotcrete, precast and composit metal deck applications. Macro synthetic fibers are also used to eliminate both early and long term cracking. Micro fibers are generally utilized to minimize early age plastic shrinkage cracking and aggregate settlement that can occur within the first 24 hours.