Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997 System 1

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 28 m.t.

Supply Capability:: 30000 m.t./month

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Specifications

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997
Size: from 8 to 32mm
Grade: HRB400, BIS460B, ASTMGR60,BS4449

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Grade: HRB335 HRB400 HRB500 HPB235 ASTM A615 Gr.40 Gr.60 Gr.75 BS449B 460B 500B

SD345 SD390 SD490 SD235 SD295

Standard: ASTM JIS GB DIN

Diameter: 8mm-32mm

Length: 6m 9m 12m

Application: construction material, building material

Port of Loading: Tianjin

Delivery Time: 25 days after confirmng your order

Packing: in bundles

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

D	THEORETICAL WEIGHT	D	THEORETICAL WEIGHT	D	THEORETICAL WEIGHT
/mm	(kg/m)	/mm	(kg/m)	/mm	(kg/m)
8	0.395	18	2	32	6.31
10	0.617	20	2.47	36	7.99
12	0.888	22	2.98	40	9.87
14	1.21	25	3.85	50	15.42
16	1.58	28	4.83

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Grade	Technical data of the original chemical composition(%)
	C	Mn	Si	S	P	B
HRB335	≤0.25	≤1.60	≤0.80	≤0.045	≤0.045	>0.00008
	Physics capability
	Yield Strength(N/cm2)		Tensile Strength(N/cm2)		Elongation (%)
	≥335		≥490		≥16

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Grade	Technical data of the original chemical composition(%)
	C	Mn	Si	S	P	V
HRB400	≤0.25	≤1.60	≤0.80	≤0.045	≤0.045	>0.00008
	Physics capability
	Yield Strength(N/cm2)		Tensile Strength(N/cm2)		Elongation (%)
	≥400		≥570		≥14

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Grade: HRB335 HRB400 HRB500 HPB235 ASTM A615 Gr.40 Gr.60 Gr.75 BS449B 460B 500B

SD345 SD390 SD490 SD235 SD295

Standard: ASTM JIS GB DIN

Diameter: 8mm-32mm

Length: 6m 9m 12m

Application: construction material, building material

Port of Loading: Tianjin

Delivery Time: 25 days after confirmng your order

Packing: in bundles

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Ribbed Reinforcing Deformed Steel Bar-BS4449:1997

Q:What is the process of deforming steel rebars for better adhesion with concrete?: Ribbing or rib deformation is the name given to the process of deforming steel rebars in order to improve their adhesion with concrete. This process entails generating small ridges or raised patterns on the surface of the rebar, which enhances the bond between the steel and the concrete. Typically, the ribbing process is carried out using a mechanical technique known as cold rolling. Cold rolling is a metalworking procedure wherein the steel rebar is passed through a sequence of rollers that apply pressure to the surface, resulting in plastic deformation. These rollers are designed with specific patterns or configurations that create the desired ribbing on the rebar. The purpose of ribbing is to augment the surface area of the rebar that comes into contact with the concrete. The ridges or patterns produced by the ribbing procedure provide additional points of adhesion for the concrete to grip onto, thereby significantly enhancing the bond strength between the two materials. This strengthened bond is vital for reinforcing concrete structures, as it helps to distribute loads and withstand tensile forces. The ribbing process finds widespread use in the construction industry for reinforcing concrete structures such as beams, columns, and slabs. The specific pattern and depth of the ribbing may vary depending on the project requirements and the type of rebar being utilized. Manufacturers often adhere to industry standards and guidelines to ensure the appropriate design and placement of ribbed rebars. To sum up, the process of deforming steel rebars to improve their adhesion with concrete involves ribbing or the creation of ridges on the rebar's surface. This is achieved through cold rolling, wherein the rebar is passed through rollers designed with specific patterns. Ribbing increases the surface area and provides additional points of adhesion, thereby enhancing the bond between the concrete and the rebar.

Q:How do steel rebars prevent concrete structures from collapsing?: Reinforcement and strength are provided to concrete structures by steel rebars, which prevent their collapse. Concrete is capable of withstanding forces that compress or squeeze it, making it a strong material. However, it is not able to withstand forces that pull it apart, resulting in weakness in tension. When subjected to tension, concrete may crack and ultimately fail. To counteract these tensile forces and offer additional strength, reinforcement bars, also known as steel rebars, are typically embedded within concrete structures. These rebars are made of high-strength steel and are strategically placed to resist the pulling forces. When external forces, such as wind or seismic activity, impact a concrete structure, the rebars assist in distributing the load and resisting tension. As the concrete attempts to separate, the rebars hold it together, preventing the propagation of cracks and maintaining the structure's integrity. Additionally, the rebars enhance the overall durability and lifespan of the concrete structure. By reinforcing the concrete, they mitigate the effects of shrinkage and thermal expansion, which can lead to cracks over time. Consequently, a more stable and resilient structure is achieved, capable of withstanding various environmental and structural stresses. In conclusion, steel rebars are crucial in averting the collapse of concrete structures, as they provide the necessary reinforcement and strength to resist tension. They elevate the structural integrity, durability, and safety of concrete structures, ensuring their ability to withstand demands and fulfill their intended purpose for extended periods.

Q:What are the different grades of steel rebars?: The different grades of steel rebars include grade 40, grade 60, grade 75, and grade 80.

Q:How do steel rebars prevent cracks in concrete?: Steel rebars prevent cracks in concrete by providing reinforcement and increasing the tensile strength of the concrete. Concrete is strong in compression but weak in tension, meaning it can withstand forces that squeeze or compress it, but is prone to cracking when subjected to tension or pulling forces. When steel rebars are embedded within the concrete, they act as a framework or skeleton, distributing the tensile forces throughout the structure. As a result, the rebars absorb the tension, preventing the concrete from cracking and failing under the applied load. The rebars also help to control the size and width of any cracks that may occur. By confining the cracks to a limited area around the rebars, they prevent the cracks from propagating and spreading throughout the entire concrete structure. Additionally, the presence of rebars can also help to prevent cracks from forming in the first place, as they reinforce the concrete and enhance its overall durability. In summary, steel rebars play a crucial role in preventing cracks in concrete by increasing its tensile strength, absorbing tension, and controlling the propagation of cracks. This reinforcement ensures the structural integrity and longevity of concrete structures, preventing potential failures and ensuring their safety.

Q:What is the average tensile strength of steel rebars?: Steel rebars typically have an average tensile strength ranging between 400 and 600 megapascals (MPa). It should be noted that the grade and type of steel used in the manufacturing process can cause variations in the specific tensile strength. Tensile strengths above 600 MPa can be achieved with higher grades of steel rebars. Moreover, the tensile strength of the rebars can also be influenced by factors like their diameter and surface condition.

Q:What are the different methods of reinforcing concrete with steel rebars?: Steel rebars are commonly used to reinforce concrete in several different ways, each designed to improve the strength and longevity of the structure. Here are some of the methods employed: 1. Traditional Reinforcement: To reinforce concrete using this method, steel rebars are placed in a grid pattern within the concrete formwork prior to pouring. Both horizontal and vertical rebars are arranged to create a network of reinforcement throughout the structure. This technique is frequently utilized in large-scale concrete structures like buildings and bridges. 2. Post-Tensioning: This technique is employed in large structures requiring high tensile strength. After the concrete has been poured and hardened, steel rebars are placed in ducts or sleeves within the concrete and subsequently tensioned using hydraulic jacks. This process reduces tensile stresses in the concrete, making it more resistant to cracking and increasing its load-bearing capacity. 3. Pre-Tensioning: Similar to post-tensioning, pre-tensioning involves tensioning steel rebars before pouring the concrete. The rebars are placed in a precast concrete form and tensioned using hydraulic jacks. Once the concrete has hardened, the tensioned rebars transfer their force to the concrete, enhancing its strength and reducing the risk of cracking. 4. Welded Wire Mesh: Instead of individual rebars, this method employs a grid of welded steel wires to reinforce the concrete. The mesh, made of high-strength steel wires, is welded together at intersections. This technique is commonly used in smaller concrete structures like sidewalks, driveways, and patios. Welded wire mesh provides uniform reinforcement throughout the concrete, minimizing the risk of cracking. 5. Fiber Reinforced Concrete: Fiber reinforced concrete (FRC) involves adding small fibers made of materials like steel, glass, or synthetic polymers to the concrete mix. These fibers are distributed throughout the mix, improving its tensile strength and reducing the likelihood of cracking. FRC is often used in situations where traditional steel rebars are unsuitable, such as thin slabs, precast elements, or shotcrete. Overall, these diverse methods allow engineers and construction professionals to enhance the strength, durability, and performance of concrete structures. The choice of method depends on factors like the structure's size and type, required strength, and construction constraints. It is crucial to consider these factors and consult with engineering professionals to determine the most suitable method for each specific project.

Q:Can steel rebars be galvanized for additional protection?: Yes, steel rebars can be galvanized for additional protection. Galvanizing is a process where a layer of zinc is applied to the surface of the steel rebar. This layer acts as a protective barrier, preventing corrosion and extending the lifespan of the rebar. Galvanized steel rebars are commonly used in construction projects where exposure to moisture, chemicals, or other corrosive elements is expected. The galvanizing process involves dipping the steel rebars into a bath of molten zinc or applying a zinc-rich coating through a hot-dip galvanizing or electroplating process. This results in a durable and corrosion-resistant coating that provides additional protection to the steel rebar, increasing its longevity and reducing maintenance requirements. Overall, galvanizing steel rebars is an effective method of enhancing their protection against corrosion and ensuring their long-term durability in various applications.

Q:Can steel rebars be used in tunneling and mining operations?: Yes, steel rebars can be used in tunneling and mining operations. Steel rebars provide structural reinforcement and support to the tunnels and mining structures, ensuring their stability and strength. They are commonly used to reinforce concrete structures in these operations due to their high tensile strength and durability.

Q:Can steel rebars be used in the construction of high-speed rail tracks?: Yes, steel rebars can be used in the construction of high-speed rail tracks. Steel rebars are commonly used as reinforcement in concrete structures, including rail tracks. The high tensile strength of steel rebars provides the necessary stability and support required for high-speed trains, ensuring the tracks can withstand the heavy loads and dynamic forces generated by these trains.

Q:How do steel rebars affect the durability of a concrete structure?: Steel rebars greatly enhance the durability of a concrete structure. By providing tensile strength to the concrete, rebars prevent cracking and improve resistance to external forces such as earthquakes and heavy loads. They also help in reinforcing the structure and preventing deterioration caused by corrosion. Overall, steel rebars play a vital role in enhancing the longevity and structural integrity of concrete constructions.

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