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Shear corrugated steel fiber is a new type of multiphase composite material formed by adding randomly distributed short shear corrugated steel fibers to ordinary concrete. These randomly distributed shear corrugated steel fibers can effectively hinder the expansion of micro cracks in concrete and the formation of macro cracks, significantly improve the tensile, bending, impact and fatigue resistance of concrete, and have good ductility.
Shear corrugated steel fiber has very reliable performance and characteristics, so it is very common in the application of concrete. Because of its unique characteristics, such as enhancing the tensile properties of concrete, it has become a popular fiber product. It can be said that shear corrugated steel fiber concrete greatly improves the performance of concrete itself and makes concrete stronger.
Since the interface bonding between the corrugated steel fiber and the concrete matrix is mainly physical, that is, the transmission of friction shear force is the main factor, the bonding performance of the steel fiber itself should be improved from the two aspects of fiber surface and fiber shape. Make the surface of the corrugated steel fiber rough and the cross section irregular. This goal can be achieved by using the melt extraction method.
Because when the steel fiber is rapidly cooled by air, the surface shrinks unevenly and becomes rough, and the cross section also shrinks into a crescent shape, increasing the contact area with the substrate.
One surface of the milled steel fiber is smooth and the other surface is rough, which also increases the contact area with the concrete. The fiber is plastically processed at a certain interval along the axis of the wavy steel fiber.
Because the surface is pressed into a prism or a waveform, the mechanical bonding force is increased. Regardless of which processing method is used to manufacture the wavy steel fiber, it encounters high heat and rapid cooling during the processing, which is equivalent to the quenching state. Therefore, the surface hardness of the steel fiber is relatively high. When used for concrete reinforcement and mixing, bending rarely occurs. If the steel fiber is too hard and brittle, it is easy to break during mixing, affecting the reinforcement effect. When the wavy steel fiber is produced by the melt-drawing method, the steel fiber centrifugally ejected from the melt-drawing wheel is still in a high temperature state and must be dispersed and cooled by rollers or vibration conveying methods. Otherwise, the wavy steel fibers gather and the heat is difficult to dissipate, but it has an annealing effect.
Courragated Steel Fiber Specification
|
Item |
Diameter (mm) |
Fiber length (mm) |
Wave depth (mm) |
Wave length (mm) |
Aspect ratio (l/d) |
Tensile strength (MPa) |
Number of fibers per kg |
Total fiber length/10 kg (m) |
|
RC39/35BN |
0.9 |
35 |
0.4–0.65 |
8.0 |
39 |
≥ 1200 |
5500 |
1925 |
|
RC50/50BN |
1.0 |
50 |
0.4–0.65 |
8.0 |
50 |
≥ 1150 |
3100 |
1550 |
|
RC60/60BN |
1.0 |
60 |
0.4–0.65 |
8.0 |
60 |
≥ 1500 |
2500 |
1550 |
|
RC39/50BN |
1.3 |
50 |
0.4–0.65 |
8.0 |
39 |
≥ 900 |
1850 |
910 |
The use of corrugated steel fibers can improve the interface bonding strength between the fiber and the concrete, thereby exhibiting superior mechanical properties of steel fibers reinforced concrete (SFRC).
However, the effect of corrugated steel fibers on full-range constitutive behaviors of concrete under uniaxial compression and tension are generally unavailable. Therefore, this paper investigated the effects of fiber volume fraction and concrete matrix strength on the compressive and tensile properties of concrete through experiments conducted on prismatic specimens containing corrugated steel fibers. Test results indicated that the concrete properties improved as both fiber volume fraction and concrete matrix strength increase, and the enhancements in tensile behaviors provided by the corrugated steel fibers were more remarkable compared to compressive behaviors. In addition, a comprehensive comparison with the results obtained from the experimental database confirmed that the corrugated steel fibers appeared to have higher reinforcing effect on concrete properties than the straight and hooked fibers. Finally, based on the composite theory, a modified coefficient of elastic modulus of SFRC was proposed, and new theoretical models were developed for the predictions of compressive strength and tensile strength of SFRC. The proposed models showed a good agreement with the test results.
Corrugated steel fiber is a kind of slender fiber made of high-strength steel, which is often used to strengthen and enhance concrete structures to improve their tensile strength and durability. The production method of steel fiber usually includes the following steps
Raw material preparation
The main raw material of corrugated steel fiber is high-strength steel wire or steel strip. These raw materials usually need to be processed by cutting or drawing to obtain the required length and diameter.
Surface treatment
In order to improve the bonding strength between corrugated steel fiber and concrete, steel fiber usually needs to be surface treated. Common surface treatment methods include galvanizing, spraying and hot-dip galvanizing, which can effectively prevent oxidation and corrosion of steel fiber.
Fiber forming
After raw material preparation and surface treatment, steel fiber needs to be formed by mechanical or wire drawing. Mechanical forming refers to shearing or pressing steel into the desired shape through specific mechanical equipment, while wire drawing is to gradually elongate steel through the drawing process to form slender fibers.
Fiber processing
After corrugated steel fiber is formed, further processing may be required to improve its performance. For example, the steel fiber can be annealed to improve its flexibility and ductility, or it can be tested by folding, hammering or stretching to ensure that it is of qualified quality.
Inspection and packaging
The corrugated steel fiber needs to undergo strict inspection to check whether its size, shape and surface quality meet the requirements. Qualified steel fibers will be packaged and marked for easy transportation and use.
Increasing the adhesion efficiency between the fiber and the concrete, in fiber reinforced concrete members, might be obtained by enhancing the properties of the concrete mixture using several parameters such as cement weight, water to cement ratio, grading curve of aggregates and admixtures, or by apply some changes on the fiber parameters such as the aspect ratio (l/d) or the outer roughness or the embedded length and the diameter value. Laboratory experiments lead to the fact that the use of smooth and straight steel fiber, in fiber reinforced concrete, produces weak bond strength between the fiber and the concrete. Therefore, to obtain better bond strength it is necessary to increase the total length of the fiber, which may cause unacceptable workability. Accordingly, it could be developed a new form of fiber has larger supporting region using the corrugated fiber shape. In this paper, the performance of this corrugated form will be monitored through new shear lag model to extract the traction separation relations between the corrugated fiber and the concrete matrix, as well as an experimental study using different values of embedded length of the fiber, in addition to several computer simulations which will be created using a finite element model and applying same dimensions and forces which are used in the laboratory experimental procedure. Through the results of nonlinear analysis of the computer simulations, the distribution of stresses in different directions for each of the concrete and the fiber can be shown, then the evolution of the bond strength between the fiber and the concrete can be monitored as an actual result of applying the corrugated shape.
Store In A Dry Place
Corrugated steel fibers should be stored in a dry place to avoid rust and corrosion. Moisture can cause damage to the steel fibers and weaken their strength. Therefore, it is important to store the Corrugated steel fibers in a dry and well-ventilated storage area.
Handle With Care
Hooked end corrugated steel fibers should be handled with care during transportation and installation. Which can reduce their bonding ability in the concrete. Care should be taken to avoid bending or twisting the fibers as this can also weaken their strength.
Mix Thoroughly
During the mixing process, it is important to ensure that the corrugated steel fibers are properly mixed with the concrete. Proper mixing ensures that the corrugated steel fibers are evenly distributed throughout the concrete mix, which enhances the performance of the concrete.
Use The Right Dosage
The amount of corrugated steel fibers added to the concrete mix depends on the specific requirements of the project. Using the right dosage ensures that the desired mechanical properties are achieved. Overdosage or underdosage of corrugated steel fibers can lead to incomplete coverage and reduced performance of the concrete.
Clean The Site
After the installation of corrugated steel fibers in the concrete, the site should be cleaned properly. Any loose fibers or debris should be removed to avoid corrosion and damage to the fibers. This also helps to maintain a clean and safe construction site.
Inspect Regularly
Regular inspection of the hooked end corrugated steel fibers is essential to ensure their quality and integrity. Any signs of damage, corrosion, or wear and tear should be addressed immediately to prevent further damage to the concrete structure.
Zhejiang Boen Metal Products Co., Ltd.
Established in 2009, factory area 17000m2.
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