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Common concrete has a low bending tensile strength, durability and crack resistance, easy brittle fracture. These weak points can be overcome by adding the Dramix steel fiber reinforcement in aggregate content. Steel fiber reinforced concrete (BTTCS) is formed on the a basis of common concrete with steel fiber reinforcement distributed in aggregate content . Dramix steel fiber is a high strength and intermittent fiber, which is randomly distributed in a concrete mix. The concept of fiber reinforced concrete has been studied since the 1960s in the world. So far, fiber reinforced concrete has been widely and commonly applied in the world. Fiber reinforced concrete is used in many various fields such as prefabricated structure, industrial floor, tunnel, slope protection… Especially, in the field of industrial floor, mixing of fiber reinforcement in concrete helps to completely replace common steel bar and reduce the floor thickness. Construction cost can be cheaper up to 30% compared to traditional plans. In Europe, for every 1000m3 of poured concrete, 300m3 is fiber reinforced concrete.
Dramix steel fiber is straight with anchor hook at both ends- when it is mixed in concrete, it shall be randomly distributed and relatively even in concrete. During load bearing process, the concrete occurs cracks, the fiber reinforcement plays a role of preventation of occurrence and limitation of the crack width, thanks to the friction force of the fiber and concrete. The design of anchor hook is to increase this friction force. Steel grade of Dramix fiber is high (> 1100Mpa) to ensure load bearing capacity of this connection.
In the first stage, the concrete shall work in a normal elastic region, at this time, the steel fiber has not worked yet. When the stress reaches a limit – the bending strength of concrete, the crack starts to become large. As for the common concrete, the structure shall suffer brittle fracture. As for the steel fiber reinforced concrete, when the crack occurs, the steel fibers begin to work and prevent expansion of crack. However, in the first instance, the number of involved steel fibers is not enough, so the stress continues reducing. When the number of involved steel fibers is sufficient, the steel fiber reinforced concrete suffers a full bending force through the friction force of the fiber and the tensile strength of the steel fiber. At this time, the design of 2 anchor heads and tensile strength of 1100Mpa start to be effective. The bending capacity of the structure increases. The load bearing capacity of steel fiber reinforced concrete can be even greater than the ones of the common concrete. When the stress of steel fiber reinforced concrete reaches the limit, the structure begins to occur destruction, the cracks occur destructive point at the foot of steel fiber – secondary crack, this is a flexible destruction when the deflection at the destructive time is extremely great. The best advantage of steel fiber reinforced concrete is that the destructive energy may be 40 times higher than common concrete. The destructive energy is a composition of stress and displacement. Thanks to this feature, when the concrete floor components bear the load, the stress circulation occurs in surrounding areas, helps to reduce and eliminate occurrence of destructive crack.
Some typical photos:
Source: Research
