Cold Rolled Deformed Bar CRB550

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Yield Point: 545-565mpa

Deformed bar is widely used in buildings, bridges, roads and other engineering construction. Big to highways, railways, bridges, culverts, tunnels, public facilities such as flood control, dam, small to housing construction, beam, column, wall and the foundation of the plate, deformed bar is an integral structure material. With the development of world economy and the vigorous development of infrastructure construction, real estate, the demand for deformed bar will be larger and larger.

Theoretical weight and section area of each diameter as below for your information:

Diameter(mm)	Section area (mm²)	Mass(kg/m)	Weight of 12m (kg)	Pcs/ton
6	28.27	0.222	2.664	375.38
8	50.27	0.395	4.74	210.97
10	78.54	0.617	7.404	135.06
12	113.1	0.888	10.656	93.84
14	153.9	1.21	14.52	68.87
16	201.1	1.58	18.96	52.74
18	254.5	2.00	24	41.67
20	314.2	2.47	29.64	33.74
22	380.1	2.98	35.76	27.96
25	490.9	3.85	46.2	21.65
28	615.8	4.83	57.96	17.25
32	804.2	6.31	75.72	13.21
36	1018	7.99	98.88	10.43
40	1257	9.87	118.44	8.44
50	1964	15.42	185.04	5.40

Q:Can steel rebars be used in corrosive chemical environments?: No, steel rebars should not be used in corrosive chemical environments as they are susceptible to corrosion which can compromise their structural integrity.

Q:How do steel rebars affect the overall load-bearing capacity of a structure?: Steel rebars significantly enhance the load-bearing capacity of a structure by reinforcing the concrete and enhancing its tensile strength. The addition of steel rebars improves the structural integrity, increases resistance to bending and cracking, and allows the structure to withstand heavier loads and external forces.

Q:Can steel rebars be used in residential foundation construction?: Yes, steel rebars can be used in residential foundation construction. Steel rebars provide reinforcement and strength to concrete, making them an essential component in the construction of residential foundations.

Q:Are steel rebars recyclable?: Yes, steel rebars are recyclable. Steel is a highly recyclable material, and steel rebars can be easily melted down and reprocessed to be used in the production of new steel products. Recycling steel rebars not only helps conserve natural resources but also reduces the environmental impact associated with the extraction and manufacturing of new steel.

Q:How do steel rebars contribute to the structural soundness of a building?: Steel rebars are crucial components in the construction industry as they play a significant role in ensuring the structural soundness of buildings. These reinforcing bars, commonly known as rebars, are made of steel and are embedded within concrete to provide additional strength and reinforcement. One of the primary ways steel rebars contribute to the structural soundness of a building is by increasing its tensile strength. While concrete is excellent when it comes to handling compressive forces, it is relatively weak in terms of tension. When a building is subject to various loads, such as those caused by wind, earthquakes, or even its self-weight, it experiences both compressive and tensile forces. By adding steel rebars to concrete, the tensile strength of the overall structure is significantly enhanced. This prevents the concrete from cracking or failing under tension, ensuring the building's stability and durability over time. Furthermore, steel rebars also improve the overall ductility of a building. Ductility refers to the ability of a material to deform under stress without fracturing. Concrete, being a brittle material, lacks ductility and tends to fail abruptly when subjected to excessive stress. By incorporating steel rebars, the concrete-reinforced structure gains the ability to absorb and distribute energy, allowing it to undergo controlled deformations without sudden failure. This increased ductility ensures that the building can withstand dynamic loads, such as those generated during an earthquake, and reduces the risk of catastrophic collapse. In addition to improving tensile strength and ductility, steel rebars also enhance the overall stability and load-bearing capacity of a building. By distributing the load more evenly across the structure, they help to minimize localized stress concentrations, preventing potential weaknesses or failure points. This distributed load-bearing capacity ensures that the building can support its intended weight and withstand the forces acting upon it. Moreover, steel rebars also contribute to the longevity of a building by providing protection against corrosion. Steel is vulnerable to rust when exposed to moisture and air, which can weaken its structural integrity. However, rebars are often coated with epoxy or other anti-corrosion materials to prevent rusting. This protective layer ensures that the steel remains intact and maintains its strength over time, further enhancing the structural soundness of the building. In summary, steel rebars play a vital role in ensuring the structural soundness of a building. They increase the tensile strength of concrete, improve its ductility, enhance load-bearing capacity, and protect against corrosion. By incorporating steel rebars, buildings can withstand various loads, resist cracking, and ensure long-term stability and durability.

Q:Can steel rebars be used in the construction of tunnels?: Yes, steel rebars can be used in the construction of tunnels. Steel rebars are commonly used as reinforcement in concrete structures, including tunnels. They provide strength and stability to the concrete, making it capable of withstanding the loads and stresses experienced in tunnel construction.

Q:What are the different types of steel coatings used on rebars?: There are several types of steel coatings commonly used on rebars, including epoxy, galvanized, and stainless steel.

Q:What is the role of steel rebars in maintaining structural integrity?: Steel rebars play a crucial role in maintaining structural integrity by reinforcing and strengthening concrete structures. They provide tensile strength to resist cracking, bending, and shearing forces, enhancing the overall stability and durability of buildings, bridges, and other infrastructure.

Q:What are the guidelines for the proper installation of steel rebars?: Achieving the structural integrity and durability of reinforced concrete structures relies heavily on the correct installation of steel rebars. To ensure their proper installation, the following guidelines must be followed: 1. Planning and Design: Prior to commencing installation, a detailed plan and design must be established. This involves determining the necessary rebar size, spacing, and configuration based on structural requirements and specifications. It is crucial to consult with structural engineers and adhere to local building codes and regulations. 2. Cutting and Bending: Rebars should be accurately cut and bent in accordance with the design specifications. The use of appropriate tools, such as rebar cutters and benders, is necessary to achieve clean cuts and precise bends. Any rebars that are damaged or corroded should be discarded and replaced. 3. Cleaning and Preparation: The surface of the rebars should be free from contaminants such as rust, oil, dirt, or loose scales before installation. The recommended method for cleaning rebars is using wire brushes or air blasting to ensure proper adhesion between the rebar and concrete. 4. Placement and Positioning: Rebars should be placed and positioned accurately based on the design drawings. They should be securely tied or supported using tie wires or rebar chairs to maintain the desired spacing and alignment. Splices should be made according to the design requirements and properly lapped to ensure continuity and strength. 5. Concrete Cover: Adequate concrete cover is crucial to protect the rebars from corrosion and provide fire resistance. The concrete cover thickness should meet the design specifications and local building codes. Proper spacing between rebars and formwork should be maintained to allow for proper concrete flow and consolidation. 6. Anchorage and Embedment: Sufficient anchorage and embedment of rebars are essential for load transfer and structural stability. Special attention should be given to providing proper hooks, bends, or mechanical anchorage at the ends of rebars as required by the design. The rebars should be appropriately embedded into adjacent concrete elements to achieve the desired bond strength. 7. Inspection and Quality Control: Regular inspection should be conducted throughout the installation process to ensure compliance with design specifications and quality standards. Any deviations or defects should be promptly identified and rectified. It is important to document the installation process and maintain proper records for future reference. By adhering to these guidelines, the proper installation of steel rebars can be accomplished, guaranteeing the structural strength, longevity, and safety of reinforced concrete structures.

Q:How are steel rebars tested for quality and strength?: Quality and strength of steel rebars are assessed through a series of standardized tests, ensuring adherence to required standards and ability to withstand anticipated loads and stresses. A primary test is the Tensile Test, which measures the maximum stress a rebar can endure before breaking. A sample rebar is pulled until it fractures, and the force needed to cause this fracture is measured. This test offers valuable data about the rebar's ultimate tensile strength, yield strength, and elongation. Another critical examination is the Bend Test, which evaluates the rebar's ductility and ability to resist breaking when bent. A sample rebar is bent to a specific angle, and any cracks or fractures are closely inspected. If there are no indications of failure, the rebar is considered acceptable. Furthermore, Chemical Analysis is performed to determine the rebar's chemical composition. This test ensures compliance with required chemical composition standards, as variations can impact the rebar's strength and durability. The Dimensional Test is conducted to verify that the rebar meets the specified standards in terms of dimensions, weight, and shape. Deviations from the required measurements can compromise the rebar's structural integrity. Additionally, the rebar's Surface Condition is visually evaluated to identify signs of rust, cracks, or other defects that could affect its performance. Proper surface condition is crucial for ensuring effective bonding with the surrounding concrete. Lastly, certain rebars undergo Non-Destructive Testing, such as ultrasonic testing or magnetic particle inspection, to identify hidden defects or cracks that may not be visible to the naked eye. In conclusion, these testing methods guarantee that steel rebars possess the necessary quality and strength for use in construction projects, providing essential reinforcement for reinforced concrete structures.

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