High grade hot rolled bar
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Reinforcing bar (Rebar) refers to the use of reinforced concrete and prestressed concrete with steel, its cross section is round, sometimes for the square with rounded corners. Including light round bar, ribbed steel bar, torsion bar. Reinforced concrete with steel bar is refers to the reinforced concrete reinforcement with straight or plate of strip steel, its appearance is divided into two kinds, light round steel and deformed steel delivery status for the straight bar and wire rod in two. Light round bar is really a small round steel and ordinary low carbon steel wire rod. Deformation is surface ribbed steel bar, usually with 2 longitudinal and cross rib of uniform distribution along the length direction. The appearance of cross rib is spiral, chevron, crescent 3 kinds. With nominal diameter mm number representation. Equals the nominal diameter is equal to the cross section deformation of reinforced light round bar nominal diameter. Reinforcement of nominal diameter is 8-50 mm, recommends to the diameter of 8, 12, 16, 20, 25, 32 and 40 mm. Steel grade: 20 mnsi, 20 mnsi MNV, 25, BS20MnSi. Rebar in concrete main tensile stress. Deformed bars as a result of the action of rib, and concrete have larger bonding ability, thus better able to withstand the role of external force. Steel is widely used in various building structures. Especially large, heavy, light thin wall and high-rise building structure.
Steel processing, steel processing to table and design review, check the material list for errors and omissions, for each steel bar to press
Material list to check whether meet the requirements, after these two checks, then press the material list sent out samples, trial production of qualified rear can batch production, processing and good reinforcement to neatly stacked in order.
Construction such as the need to be reinforced by substitution, must fully understand the design intent and substitution material performance, strictly abide by the current design code of reinforced concrete rules, not to area such as the substitution of low strength of high strength steel reinforcement. Any important parts of a reinforced substitution, shall agree with the consent of party a, design unit, and have a written notice shall be substitution.
(1) the steel surface should be clean, sticky oil, dirt, rust must be cleaned before use, can be combined with cold-drawn rust removal process.
(2) reinforced straightening, usable mechanical or manual straightening. After straightening of steel can not have local small bending, die bending, wavy, its surface scars should not be made of steel decreases by 5%.
(3) the steel bar cutting should be according to the number, diameter, length and quantity, the length is tie-in, first cutting long expected, by cutting short expected to reduce short head, and shorten the steel to save steel.
(4) steel hook or bend:
1) steel hook. There are three kinds of forms, respectively semicircle hook, hook and hook. After bending, bend endothelial contraction, skin
Extension, axis length is constant, bend arc formation, size is greater than the baiting size after bending, bending modifier should be considered.
Reinforced bending diameter of 2.5 d heart, straight part for 3 d. Steel hook increase the length of the theoretical calculation value: counter rotating round hook is 6.25 d, the straight
Hook is 3.5 d, the hook is 4.9 d.
(2) the bending of steel. Middle bending diameter D bend, not less than five times the diameter of the reinforcing steel bar.
(3) the stirrup. Stirrups should be done at the end of the hook, hook form should meet the design requirements. Stirrup adjustment, is the hook to increase the length and bending adjustment
Value or the difference between the two and, according to the amount of stirrup outsourcing size or inside the package size.
(4) reinforced blanking length should be according to the component size, concrete cover thickness, rebar bend modifier and hook to increase the length of the provisions as comprehensive exam
Lv.
A. straight reinforced blanking length = member length - protective layer thickness increase length + hook,
B. turn up steel blanking length = straight length - bend modifier + + inclined curved length increase length of hook,
C. blanking length = stirrup stirrup inner perimeter + modifier + hook to increase length of stirrup.
- Q:How do steel rebars affect the shrinkage and creep of concrete?
- Concrete's shrinkage and creep behavior can be significantly influenced by steel rebars. Shrinkage refers to the concrete's volume reduction caused by moisture loss during drying, while creep refers to its time-dependent deformation under sustained load. The inclusion of steel rebars helps mitigate concrete shrinkage. As the concrete shrinks, the rigid rebars resist this reduction and provide restraint. This restraint minimizes volume changes and reduces cracking caused by shrinkage. Moreover, the tensile strength of rebars allows them to distribute stress and prevent localized cracking, further minimizing the impact of shrinkage on overall concrete performance. Regarding creep, steel rebars can increase concrete's deformation. This is because the rebars introduce additional stress and strain, leading to greater creep deflections. However, compared to factors like mix design, water-cement ratio, and curing conditions, the effect of steel rebars on creep is generally considered minor. It's important to note that proper reinforcement layout design and detailing can minimize the impact of steel rebars on shrinkage and creep. Adequate spacing, rebars cover, and reinforcement ratios optimize both concrete and rebars' performance. Additionally, the use of supplementary cementitious materials like fly ash or silica fume can reduce shrinkage and mitigate creep's impact. In summary, steel rebars are crucial in minimizing concrete's shrinkage-related issues through restraint and stress distribution. Though they may increase creep deformation, their impact is generally minor compared to other factors. Proper reinforcement design and detailing optimize concrete and steel rebars' performance in terms of shrinkage and creep.
- Q:Are steel rebars suitable for use in extreme weather conditions?
- Yes, steel rebars are suitable for use in extreme weather conditions. Steel has excellent structural strength and durability, making it resistant to harsh environmental factors such as high winds, heavy rainfall, extreme temperatures, and even seismic activity. Additionally, steel rebars can be coated or treated to provide further protection against corrosion in areas with high humidity or exposure to saltwater. Overall, steel rebars are a reliable choice for ensuring the structural integrity of buildings and infrastructure in extreme weather conditions.
- Q:How do steel rebars affect the overall seismic performance of a structure?
- Steel rebars play a crucial role in improving the overall seismic performance of a structure. By reinforcing concrete elements, such as beams, columns, and slabs, rebars enhance the structural integrity and ductility of the building. This means that during an earthquake, the rebars help the structure withstand the lateral forces and deformations, minimizing the risk of collapse. Additionally, the presence of rebars improves the energy dissipation capacity of the structure, allowing it to absorb and dissipate seismic energy, further enhancing its resilience.
- Q:Can steel rebars be galvanized for additional protection?
- Additional protection can be provided to steel rebars by galvanizing them. Galvanization involves applying a layer of zinc to the surface of the rebars, which acts as a protective barrier. This prevents corrosion and extends the lifespan of the rebars. In construction projects where exposure to moisture, chemicals, or other corrosive elements is anticipated, galvanized steel rebars are commonly used. The galvanization process can be carried out by immersing the rebars in a bath of molten zinc or by applying a zinc-rich coating through hot-dip galvanization or electroplating. As a result, a durable and corrosion-resistant coating is formed, which adds extra protection to the rebars, increasing their longevity and reducing the need for maintenance. In summary, galvanizing steel rebars is an effective method for enhancing their corrosion resistance and ensuring their long-term durability in a variety of applications.
- Q:How do steel rebars affect the overall maintenance requirements of concrete structures?
- Steel rebars play a crucial role in the overall maintenance requirements of concrete structures. These reinforcing bars are used to enhance the strength and durability of concrete by providing tensile strength and preventing cracks. By adding steel rebars to concrete, the structure becomes better equipped to resist the forces that it may encounter during its lifespan. One of the primary ways that steel rebars affect maintenance requirements is by reducing the likelihood of cracks in concrete structures. Concrete on its own is strong in compression but weak in tension. When subjected to tensile forces, such as loads or temperature fluctuations, concrete tends to crack. However, by incorporating steel rebars within the concrete, these cracks are minimized or prevented altogether. This is because the steel rebars absorb the tensile forces, allowing the concrete to remain intact and intact structures require less maintenance. Furthermore, steel rebars also increase the overall strength of concrete structures, making them more resistant to external forces. This added strength reduces the chances of structural failure, thereby decreasing the maintenance requirements in terms of repairs or replacements. Additionally, the use of steel rebars can extend the lifespan of concrete structures, as they provide the necessary reinforcement to withstand the test of time. However, it is essential to note that steel rebars can also be susceptible to corrosion over time, which can impact the maintenance requirements of concrete structures. When steel rebars corrode, they expand, causing cracks and spalling in the concrete. This corrosion can be accelerated by various factors such as exposure to moisture, chloride ions, or carbonation. Therefore, regular inspections and maintenance measures, such as protective coatings or cathodic protection, must be implemented to prevent or manage the corrosion of steel rebars. In conclusion, steel rebars have a significant impact on the overall maintenance requirements of concrete structures. They enhance the strength, durability, and resistance of concrete, reducing the occurrence of cracks and structural failures. However, proper maintenance and protection against corrosion are necessary to ensure the continued effectiveness of steel rebars, ultimately contributing to the longevity and low maintenance needs of concrete structures.
- Q:How do steel rebars prevent cracks in concrete structures?
- Steel rebars prevent cracks in concrete structures by providing reinforcement and increasing the tensile strength of the concrete. When concrete is exposed to tensile forces, such as those caused by external loads or temperature changes, it tends to crack. However, steel rebars, which are embedded within the concrete, act as a reinforcement and absorb these tensile forces. The rebars distribute the load more evenly throughout the structure, preventing localized stress and minimizing the formation of cracks.
- Q:What does thread steel have to do with scrap steel?
- There is some dealers do not scale steel processing business, because of the non standard long thread steel ruler to teach cheap price, dealers can not only earn processing fees can also earn the price difference, because the processed steel ruler with non positive material standard screw thread steel is the same price, reasonable use of processing small not waste head down more than the standard, but the boss is also doing scrap. Answered so much hope to adopt.
- Q:Can steel rebars be used in pre-tensioned or post-tensioned structures?
- Steel rebars can be used in both pre-tensioned and post-tensioned structures. In pre-tensioned structures, rebars are pre-stressed before the concrete is poured, while in post-tensioned structures, rebars are stressed after the concrete has hardened. The use of steel rebars provides strength and reinforcement to the structures, making them suitable for both pre-tensioned and post-tensioned applications.
- Q:How are steel rebars measured and cut on construction sites?
- Steel rebars are typically measured and cut on construction sites using measuring tapes, chalk lines, and portable cutting tools such as rebar cutters or angle grinders. The rebars are accurately measured according to the required dimensions, marked with chalk lines, and then cut using the appropriate cutting tool to ensure precise lengths and shapes for construction purposes.
- Q:What is the process of handling and transporting steel rebars on-site?
- The process of handling and transporting steel rebars on-site involves several steps to ensure their safe and efficient movement. 1. Receiving: The first step is the receipt of the steel rebars at the construction site. This typically involves unloading the rebars from the delivery truck and inspecting them for any damage or defects. 2. Storage: Once unloaded, the rebars are typically stored in a designated area, known as a rebar yard. The rebars are arranged and stacked in a way that allows for easy access and prevents them from getting damaged or tangled. 3. Cutting and bending: Depending on the specific requirements of the construction project, the rebars may need to be cut or bent to a certain shape before installation. This process is typically done using specialized tools and equipment, such as rebar cutters and benders. 4. Transportation to the work area: Once the rebars are cut and bent, they need to be transported to the specific area on the construction site where they will be installed. This can be done manually by workers carrying individual rebars or by using mechanical equipment, such as cranes or forklifts, to move larger quantities of rebars at once. 5. Installation: Once the rebars have been transported to the work area, they are installed according to the project's design and specifications. This usually involves placing the rebars into the appropriate position within the concrete structure, such as columns, beams, or slabs. Throughout the entire process, it is crucial to follow safety guidelines to prevent accidents or injuries. This includes wearing appropriate protective gear, such as gloves and safety boots, and ensuring that the rebars are handled and transported in a way that minimizes the risk of tripping or falling. Additionally, regular inspections should be conducted to check for any damage or defects in the rebars, as these can compromise the structural integrity of the construction project.
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High grade hot rolled bar
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- Loading Port:
- China Main Port
- Payment Terms:
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- Min Order Qty:
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