• Five Point Five mm Cold Rolled Steel Rebars in coils System 1
Five Point Five mm Cold Rolled Steel Rebars in coils

Five Point Five mm Cold Rolled Steel Rebars in coils

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Loading Port:
China Main Port
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TT OR LC
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Supply Capability:
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Specifications of Steel Rebar:

Name

Cold Rolled Steel Rebar

Diameter

5mm, 5.5mm, 6mm, 6.5mm, 7mm, 8mm, 9mm, 10mm,

11mm, 12mm,

Length

6M, 9M, 12M or as required

Price

Keep lower operating costs so as to offer competitive price for our clients

Label

to be specified by customer, generally, each bundle has1-2 labels

Application

Building, construction

Invoicing

Actual or Theoretical Weight Basis as buyer’s request.

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

Diameter(mm)

Section area     (mm²)

Mass(kg/m)

5.5

23.7

0.186

Packaging & Delivery of Steel Rebar:

Packaging Detail: products are packed in bundle and then shipped by container or bulk vessel, deformed bar is usually naked strapping delivery, when storing, please pay attention to moisture proof. The performance of rust will produce adverse effect.

Each bundle weight: 2-3MT, or as required

Payment terms: TT payment in advance or Irrevocable LC at sight.

Trade terms :FOB, CFR, CIF

Delivery Detail: within 45 days after received advanced payment or LC.

Q:How are steel rebars protected against chemical attacks in concrete?
Steel rebars are protected against chemical attacks in concrete by using different strategies such as using high-quality concrete with low permeability, adding corrosion inhibitors or protective coatings to the rebars, and ensuring proper concrete cover to prevent direct contact between the steel and aggressive chemicals.
Q:What is the typical weight of a steel rebar?
The typical weight of a steel rebar varies depending on its size and length. However, a commonly used steel rebar, such as a #4 rebar, typically weighs around 9.5 pounds per foot or 14.2 kilograms per meter.
Q:How do steel rebars prevent concrete structures from spalling?
Steel rebars prevent concrete structures from spalling by providing reinforcement and increasing the overall strength of the concrete. Spalling refers to the cracking and breaking off of the concrete surface, usually due to the expansion of internal pressure from various external factors such as temperature changes, moisture, or structural loads. When steel rebars are embedded within the concrete, they act as a support system that helps distribute the applied loads more evenly throughout the structure. This reinforcement prevents localized stress concentrations, which can lead to spalling, by absorbing and dissipating the load. By reinforcing the concrete, rebars enhance its tensile strength and improve its ability to withstand external forces. Moreover, steel rebars also help to control the formation of cracks in the concrete. As concrete is a brittle material with low tensile strength, it is prone to cracking under stress. However, the presence of rebars inhibits the propagation of cracks by bridging them and transferring the stress to the surrounding concrete. This prevents the cracks from spreading and ultimately leads to a more durable and resilient structure. Additionally, steel rebars provide protection against corrosion. Concrete is naturally alkaline, which creates a protective layer on the steel surface, preventing it from rusting. This alkaline environment acts as a barrier against corrosion, ensuring the rebars maintain their structural integrity over time. By avoiding corrosion, the rebars can continue to provide reinforcement and prevent spalling in the concrete structure. In summary, steel rebars play a crucial role in preventing spalling in concrete structures by providing reinforcement, improving tensile strength, controlling crack formation, and protecting against corrosion. By enhancing the overall stability and durability of the concrete, rebars ensure that the structure can withstand various external pressures and maintain its integrity for an extended period.
Q:How do steel rebars enhance the bond between concrete and reinforcement?
The bond between concrete and reinforcement is improved by steel rebars through various mechanisms. Firstly, the inclusion of rebars in concrete enhances the mechanical interlock between the two materials. As concrete surrounds the rebars, it fills the spaces between the steel bars, resulting in a strong bond once it solidifies. This mechanical interlock effectively prevents the separation of concrete and reinforcement, particularly when subjected to tensile loads. Secondly, steel rebars augment the bond by offering additional surface area for adhesion. The rough texture of the rebars allows the concrete to firmly grip the steel surface, leading to a stronger bond. This adhesion is further enhanced by the formation of corrosion products on the rebars over time, creating an even rougher surface and increasing the bond strength between the concrete and reinforcement. Thirdly, rebars serve as load transfer devices in concrete structures. When external forces act on the structure, the rebars distribute and transfer these forces to the surrounding concrete. This load transfer mechanism significantly improves the overall structural integrity and performance of the concrete element. Furthermore, steel rebars also reinforce the bond between concrete and reinforcement by their ability to resist deformation. Under tensile loads, the rebars elongate and absorb the stress, preventing the concrete from developing cracks. This prevents the formation of cracks that could compromise the bond between the two materials. To summarize, steel rebars enhance the bond between concrete and reinforcement by providing mechanical interlock, increased surface area for adhesion, load transfer capabilities, and resistance to deformation. Together, these factors contribute to the overall strength, durability, and performance of reinforced concrete structures.
Q:What are the guidelines for handling and disposing of steel rebars after demolition?
The guidelines for handling and disposing of steel rebars after demolition include the following: 1. Identification: It is important to identify the steel rebars and differentiate them from other construction debris. This can be done by marking or labeling the rebars appropriately. 2. Segregation: Separate the steel rebars from other waste materials on-site. This ensures that they can be properly handled and recycled or disposed of accordingly. 3. Demolition process: During the demolition process, care should be taken to minimize damage to the steel rebars. This includes using appropriate tools and techniques to avoid excessive bending or cutting, which can affect their recyclability. 4. Removal and transportation: After demolition, the steel rebars should be carefully removed from the site and transported to the designated area for further processing or disposal. This may involve the use of machinery or manual labor, depending on the quantity and size of the rebars. 5. Recycling: Steel rebars are highly recyclable and should be sent to a recycling facility whenever possible. These facilities can process the rebars and convert them into new steel products, reducing the need for extracting and manufacturing new materials. 6. Disposal: If recycling is not feasible, the steel rebars may need to be disposed of in accordance with local regulations. This may involve taking them to a designated landfill or waste disposal site that can handle construction materials. 7. Safety precautions: It is important to follow safety precautions when handling steel rebars. This includes wearing appropriate personal protective equipment (PPE) such as gloves and safety glasses, as well as using proper lifting techniques to prevent injuries. 8. Compliance with regulations: Ensure that all handling and disposal activities comply with local, state, and federal regulations. This may include obtaining necessary permits or licenses, as well as adhering to specific guidelines for waste management and recycling. By following these guidelines, the handling and disposal of steel rebars after demolition can be done in an environmentally responsible and safe manner, contributing to sustainable construction practices.
Q:What are the different sizes of steel rebars available in the market?
The sizes of steel rebars available in the market vary depending on the specific needs and requirements of construction projects. Generally, steel rebars come in a range of diameters, commonly ranging from 6mm to 40mm. These sizes are designated by the nominal diameter of the rebar. The most commonly used sizes of steel rebars in the market are 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 25mm, 32mm, and 40mm. These sizes are widely used in various construction applications and are readily available in most hardware stores. The choice of rebar size depends on the structural design, the load-bearing capacity required, and the specific construction project. Smaller diameter rebars, such as 6mm or 8mm, are commonly used in light construction projects or where lesser load-bearing capacity is needed. On the other hand, larger diameter rebars, such as 25mm or 32mm, are often used in heavy-duty construction projects or structures requiring higher load-bearing capacity. It is important to consult with structural engineers or construction professionals to determine the appropriate rebar size for a specific project, as they can provide guidance based on the design requirements and structural calculations.
Q:What are the common problems associated with steel rebars in concrete structures?
Some common problems associated with steel rebars in concrete structures include corrosion, inadequate cover, improper placement, and improper anchorage. One of the most significant issues is corrosion. Steel rebars are susceptible to corrosion when exposed to moisture and oxygen, especially in harsh environments such as coastal areas or regions with high humidity. Corrosion can weaken the rebars, leading to structural deterioration and reduced load-bearing capacity of the concrete structure. Another problem is inadequate cover, which refers to insufficient concrete cover over the rebars. Inadequate cover can occur due to poor construction practices or design errors. When rebars are not adequately covered, they are more prone to corrosion as they are exposed to external elements. Additionally, inadequate cover can compromise the structural integrity of the concrete, especially in terms of fire resistance and durability. Improper placement of rebars can also cause problems in concrete structures. If rebars are not properly aligned or spaced according to the design specifications, it can result in weak sections within the concrete. This can lead to uneven load distribution and potential structural failure. Improper placement can also hinder the effectiveness of rebars in reinforcing the concrete, compromising the overall strength of the structure. Improper anchorage of rebars is another common problem. Adequate anchorage is crucial to ensure that the rebars effectively transfer the load between different sections of the concrete structure. If the rebars are not properly anchored, they may slip or pull out under stress, reducing the structural strength and stability of the concrete. To mitigate these problems, it is essential to follow proper construction practices and adhere to design specifications. This includes ensuring proper concrete cover, correct placement and alignment of rebars, adequate anchorage, and using corrosion-resistant rebars or protective coatings in corrosive environments. Regular inspections and maintenance are also necessary to detect and address any potential issues with steel rebars in concrete structures.
Q:What are the methods used for corrosion protection of steel rebars?
Steel rebars can be protected from corrosion using various methods. Firstly, a commonly used method is to apply a protective coating on the surface of the steel rebar. This coating acts as a barrier, stopping moisture and oxygen from reaching the steel surface and causing corrosion. Different techniques like hot-dip galvanizing, epoxy coatings, or fusion-bonded epoxy coatings can be employed to apply these coatings. Another method is cathodic protection, which involves using sacrificial anodes or impressed current systems. Sacrificial anodes, made of a more reactive metal like zinc or magnesium, corrode over time instead of the steel rebar, ensuring its protection. Impressed current systems utilize an external power source to provide a protective current to the steel rebar, preventing corrosion. A simple but effective method is to provide a sufficient concrete cover over the steel rebar. This concrete acts as a physical barrier, shielding the steel from the environment. It is critical to design the thickness of the concrete cover according to specific standards to guarantee proper protection. Corrosion inhibitors can also be employed by adding them to the concrete mix or applying them on the surface of the steel rebar. These inhibitors work by reducing the corrosive effects of moisture and oxygen on the steel surface. They can be organic or inorganic compounds that form a protective layer, inhibiting the corrosion process. Lastly, proper design and construction practices are crucial for corrosion protection. This includes avoiding the use of dissimilar metals that can cause galvanic corrosion, ensuring proper drainage to prevent water accumulation, and taking measures to minimize exposure to corrosive environments. It is important to note that a combination of these methods is often used to provide optimal corrosion protection for steel rebars, depending on the specific project requirements and environmental conditions.
Q:What are the considerations for using epoxy-coated steel rebars?
When using epoxy-coated steel rebars, there are several considerations to keep in mind. Firstly, it is important to ensure that the coating is properly applied and has adhered well to the rebar surface to provide effective protection against corrosion. Secondly, the epoxy coating should be resistant to chemicals commonly found in the construction environment. Additionally, the handling and storage of epoxy-coated rebars should be done with care to avoid any damage to the coating. It is also crucial to follow the recommended installation practices to prevent any damage or delamination of the epoxy coating during the concrete pouring process. Lastly, periodic inspection and maintenance should be carried out to ensure the longevity of the epoxy-coated steel rebars and to address any potential damages or breaches in the coating.
Q:Are steel rebars suitable for use in aggressive environments?
Indeed suitable for use in aggressive environments are steel rebars. Commonly utilized in construction projects, particularly in reinforced concrete structures, steel rebars possess high tensile strength and durability. However, when exposed to corrosive elements like moisture, chloride ions, and chemicals, corrosion may occur, leading to weakened rebars and compromised structural integrity of the concrete. To counteract this issue, protective materials such as epoxy or zinc are often applied to steel rebars, creating a barrier against corrosion. Moreover, stainless steel rebars, with their superior corrosion resistance properties, are also employed in aggressive environments. In conclusion, although steel rebars generally prove suitable for aggressive environments, it is essential to consider specific conditions and implement appropriate protective measures to prevent corrosion and uphold the longevity of the reinforced concrete structure.

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