GR40 deformed steel bar for construction

GR40 deformed steel bar for construction System 1

GR40 deformed steel bar for construction

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 10000 m.t./month

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Product Description:

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

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

Usage and Applications of Construction

1. Construction steel round bar is mostly used for straight bundles supply, and used for steel, bolts and various mechanical parts. While the bigger round bar, or more than 25mm hot rolled bar, is mainly for the manufacture of mechanical parts or for seamless steel billet.

2. Steel round bar is used in construction and a large number of architectural and engineering structures.

3. Besides, we can supply some especial material steel round bar that can be used for main shaft of steamer, hummer shank, with big section and supper force.

Packaging & Delivery

Packaging Detail: All goods are packed in bundle with steel strips and shipped by break bulk vessel or container (depend on target market and different ports)

Delivery Detail: 45 days

Trade terms: FOB, CFR, CIF

MOQ: 25 tons per specification; we can negotiate the quantity if the specification is normal or we have stock of one specification.

Weight: Theprice invoicing on theoretical weight basis or actual weight basis depends on customer’s request.

Shipment: The shipment of bulk break or container is depends on customer’s request and the situation of the port of destination.

Documents given: Full set of original clean on board bill of lading; Original signed commercial invoice; Original packing list; Policy of insurance; Certificate of origin and what the target market needs.

GR40 deformed steel bar for construction

Q: What are the factors that can affect the lifespan of steel rebars in concrete structures?: There are several factors that can affect the lifespan of steel rebars in concrete structures. Firstly, the quality and composition of the concrete used in the structure play a significant role. If the concrete is of poor quality or contains harmful chemicals, it can cause corrosion of the steel rebars, leading to a shorter lifespan. Adequate measures should be taken during the construction process to ensure the concrete mixture is properly proportioned and cured. Secondly, the exposure conditions that the concrete structure is subjected to can greatly impact the lifespan of steel rebars. Factors such as humidity, temperature variations, and the presence of aggressive substances like chloride ions or carbon dioxide can accelerate the corrosion process. Structures located in coastal areas or industrial environments are particularly vulnerable due to the high salt content in the air or the presence of pollutants. Thirdly, the design and construction practices employed have a significant impact on the longevity of steel rebars. Proper cover thickness, which refers to the distance between the surface of the rebar and the outer face of the concrete, is crucial. Inadequate cover thickness can lead to insufficient protection against corrosion. Additionally, the design should incorporate effective drainage systems to prevent the accumulation of water around the rebars, as stagnant moisture can accelerate corrosion. Furthermore, maintenance practices also play a role in the longevity of steel rebars. Regular inspections, cleaning, and repairs can help identify and address any issues before they become severe. Applying protective coatings or using corrosion inhibitors can also extend the lifespan of the rebars. Lastly, the type and quality of the steel rebars themselves are important factors. Rebars with higher levels of carbon and alloying elements are generally more resistant to corrosion. Additionally, the quality of the manufacturing process and the presence of any impurities can affect the rebars' durability. In conclusion, the lifespan of steel rebars in concrete structures can be influenced by various factors including the quality of the concrete, exposure conditions, design and construction practices, maintenance, and the quality of the rebars themselves. Proper attention to these factors can help ensure the longevity and structural integrity of concrete structures.

Q: Are there any limitations or restrictions on using steel rebars in construction?: Yes, there are certain limitations and restrictions on using steel rebars in construction. Firstly, the size and shape of rebars should comply with the specifications provided by engineering and construction standards. Additionally, the placement and spacing of rebars should follow the structural design and building codes to ensure proper reinforcement and structural integrity. Moreover, any potential corrosion or exposure to harsh environments can affect the durability of steel rebars, so appropriate protective measures should be taken. Lastly, the cost of steel rebars can be a limitation, especially in projects with budget constraints.

Q: How do steel rebars affect the thermal properties of concrete?: The thermal properties of concrete can be affected in both positive and negative ways by the presence of steel rebars. On the positive side, steel rebars can enhance the overall thermal conductivity of the concrete, enabling more efficient heat transfer and distribution within the structure. This can be advantageous in situations where thermal conductivity is desirable, such as in buildings with radiant heating systems. However, there is a discrepancy in the thermal expansion and contraction characteristics between steel and concrete. This dissimilarity in thermal expansion coefficients can result in the formation of thermal stresses and potential cracks within the concrete, particularly during temperature fluctuations. These cracks have the potential to compromise the structural integrity of the concrete and may necessitate additional reinforcement measures to mitigate their effects. In summary, the inclusion of steel rebars can influence the thermal properties of concrete by augmenting its thermal conductivity and potentially giving rise to thermal stresses and cracks. It is crucial to take these factors into account during the design and construction stages to ensure the desired performance and durability of the concrete structure.

Q: Can steel rebars be used in bridges and highways?: Yes, steel rebars can be used in bridges and highways. Steel rebars provide strength and durability to structures, making them suitable for use in the construction of bridges and highways.

Q: What is the allowable stress for steel rebars?: The allowable stress for steel rebars typically depends on the specific grade of steel being used. Generally, the allowable stress for steel rebars ranges from 40,000 to 60,000 pounds per square inch (psi) in structural applications. However, it is crucial to refer to the relevant design codes and specifications to determine the exact allowable stress for the specific grade of steel rebar being utilized.

Q: Do steel rebars have any specific markings or codes?: Yes, steel rebars have specific markings and codes that provide information about their size, grade, and manufacturer. These markings are essential for quality control, identification, and compliance with construction standards.

Q: What is the weight of steel rebars per meter or foot?: The weight of steel rebars per meter or foot can vary based on the size and type of rebar utilized. Standard steel rebars are typically accessible in different diameters, ranging from 6mm to 50mm. By multiplying the cross-sectional area of the rebar (measured in square meters or square feet) by the density of steel (approximately 7850 kilograms per cubic meter or 0.2836 pounds per cubic inch), one can ascertain the weight per meter or foot. To provide an example, let's examine a standard rebar with a diameter of 10mm. The cross-sectional area can be determined using the formula for the area of a circle (πr²), where r represents the radius of the rebar (5mm in this case). Assuming the unit of measurement is a meter, the cross-sectional area would equal π(0.01m)² = 0.000314 square meters. By multiplying this value by the density of steel, we arrive at 0.000314m² * 7850kg/m³ = 2.464 kilograms per meter. Similarly, if we were to calculate the weight in pounds per foot, we would convert the density of steel to pounds per cubic foot (approximately 490 pounds per cubic foot) and multiply the cross-sectional area by this figure. It is important to note that weight may slightly vary depending on the specific steel grade employed. Therefore, it is advisable to consult the manufacturer's specifications or a reliable reference for precise weight calculations.

Q: How are steel rebars cut and bent on-site?: Steel rebars are cut and bent on-site using specialized equipment such as rebar cutters and benders. The rebars are measured, marked, and then cut to the required length using the cutter. After cutting, the rebars are placed into the bender machine where they are bent to the desired shape or angle. This process ensures that the rebars are tailored to fit the specific construction requirements of the project.

Q: What are the factors to consider while designing with steel rebars?: There are several factors to consider when designing with steel rebars, which play a crucial role in ensuring the structural integrity and performance of a construction project. 1. Load capacity: One of the primary factors to consider is the anticipated load capacity of the structure. Steel rebars are designed to provide reinforcement and enhance the tensile strength of concrete. Therefore, the size, spacing, and placement of rebars should be determined based on the expected loads that the structure will be subjected to. 2. Structural requirements: Different structural elements may have specific design requirements. For instance, beams, columns, slabs, and foundations have unique load distribution patterns, and the design of rebars should be tailored to meet these specific needs. The dimensions, quantity, and arrangement of rebars will vary based on the intended structural purpose. 3. Durability: Steel rebars are exposed to various environmental conditions, such as moisture, temperature fluctuations, and chemical exposure. These factors can lead to corrosion, which can significantly impact the strength and longevity of the structure. Therefore, designers need to consider the required level of durability and specify appropriate protective measures, such as using epoxy-coated rebars or providing sufficient concrete cover. 4. Construction methodology: The construction method used for the project can influence the design of steel rebars. Factors such as formwork, construction joints, and accessibility during the placement of rebars need to be taken into account. The design should accommodate the construction process, ensuring ease of installation and proper alignment of rebars. 5. Building codes and regulations: Compliance with local building codes and regulations is crucial to ensure the safety and legality of the structure. Designers must consider the specific requirements outlined in the codes, including minimum rebar sizes, spacing, and cover requirements. Adhering to these standards ensures that the structure meets the necessary safety standards and can withstand potential hazards. 6. Cost-effectiveness: While ensuring structural integrity, it is also essential to consider the cost-effectiveness of the design. Optimizing the placement and arrangement of rebars can help minimize material and labor costs without compromising the safety and performance of the structure. In conclusion, designing with steel rebars involves considering factors such as load capacity, structural requirements, durability, construction methodology, building codes, and cost-effectiveness. By carefully evaluating these factors, designers can create robust, safe, and long-lasting structures.

Q: How are steel rebars affected by temperature fluctuations?: Steel rebars are affected by temperature fluctuations in a phenomenon known as thermal expansion and contraction. When exposed to high temperatures, rebars expand, increasing in length. Conversely, in low temperatures, rebars contract, decreasing their length. These temperature-induced changes can lead to structural problems, such as cracking and warping, if not properly accounted for during construction or if the temperature fluctuations are extreme.

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