Korea standard hot rolled reinforced bar
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Korea standard steel is also known as the deformed bars, surface bamboo shaped protrusions square or round steel, used for reinforced concrete, than the general square steel and round steel with more firmly. Early domestic steelform is bamboo, then reference the British standard, is now hot rolled ribbed steel bar, JIS and Korean standard screw thread steel or bamboo form.
Hot rolled reinforced bar should have a certain strength, i.e. the yield point and tensile strength, it is the main basis for structure design. At the same time, in order to meet the structural deformation, absorb the earthquake energy andprocessing requirements, hot rolled reinforced bar should also have theplasticity, toughness, welding and bonding properties between steel bar and concrete good.
Classification
Reinforced grade
The strength grade of 24/38 kg, is made of round steel bar killed steel, semi killed steel rimmed steel No. 3 or ordinary carbon steel rolling. It belongs to the low strength steel, has good plasticity, high elongation (delta 5 above 25%),easy bending forming, easy welding etc.. It is used very widely, can be used asthe main force in the reinforcement of reinforced concrete structure, small,member of the stirrups, steel, wood structure of the rod. Wire rod steel can be used as cold drawn low carbon steel wire and double reinforced materials.
II grade reinforced bar
Low alloy steel rolling or semi killed steel reinforced with grade II, with silicon,manganese as solid solution strengthening elements. Level II steel bar intensity level of 34 (32) /52 (50) kg, its high strength, good plasticity, the welding performance is good. The surface of steel rolling longitudinal rib longand uniformly distributed transverse rib, thereby strengthening the bondbetween concrete and steel bars. As with level II steel reinforced concretestructure stress of reinforced, than the use of reinforced grade of steel can be saved 40 ~ 50%. Therefore, widely used in large and medium-sized steel reinforced concrete structure, such as the main reinforcement of bridges,dams, port engineering and building structure. Level II steel after cold drawing,can also be used as prestressing steel building structure.
Grade
III main performance level II steel reinforced with roughly the same strengthlevel for 38/58 kg. Grade was renamed the HRB400 Grade Reinforced bar.Simply put, the same point of the two kinds of steel bar is: all belong to thecommon low alloy hot rolled reinforced bar; belong to the ribbed bar (usually said that the thread bars); can be used for ordinary reinforced concrete structure.
IV grade reinforced bar
IV reinforced the strength level of 55/85 kg, medium carbon low alloy killed steel rolling, which are divided by silicon, manganese as main alloy elements,also adding vanadium or titanium as solid solution and precipitationstrengthening elements, which increases the strength at the same time ensure its plasticity and toughness. Grade rebar surface is rolled with the longitudinal reinforcement and transverse rib, which is the main housing construction of theprestressed reinforced. Reinforcing bar of grade before use by the construction unit for cold processing, cold stress is 750 MPa, in order to improve the yield point, exert the inherent potential of steel products, achieve the purpose of saving steel. The cold drawn steel bar, the yield point is not obvious, so the design in cold stress Statistics (cold drawing design strength)as the basis. But the cold had reinforced after months of natural aging orartificial heating aging, reinforced will appear short yielding stage, its value is slightly higher than that of cold stress, at the same time the steel withhardened tendency, this phenomenon is called "age hardening". Therefore,cold drawn steel while guaranteeing the provisions of cold stress, to control thecold drawing elongation but, lest reinforced brittle. IV grade steel with high carbon content, the general use of flash butt welding - warm - flash welding ortechnology electric heat treatment after welding, to ensure that the weldinghead, including the heat affected zone of hard tissue does not producequenching, prevent the occurrence of brittle fracture. IV grade reinforced bardiameter is 12 millimeter commonly and widely used in prestressed concreteslabs and bundle configuration for components of large prestressedconstruction (such as the roof, crane beam). Hot rolling reinforcing bar of grade as prestressed reinforced when in use, still need to be drawn, welding,its strength is low, the need to further improve.
Finishing rolling rebar
In order to solve the problem of large diameter and high strength prestressed reinforcement and anchorage connection problems, has been developed successfully finishing rolling rebar. It is in the direct rolling steel surface withoutlongitudinal reinforcement and transverse rib reinforced trapezoidal screw buckle shape, available connection sleeve connected with long, with a specialnut as anchorage. This steel has been used in large scale prestressed concrete structure, bridge structure, success.
- Q:What is the purpose of steel rebars in construction?
- The purpose of steel rebars in construction is to provide reinforcement and strength to concrete structures, helping to prevent cracking and improve overall structural integrity.
- Q:What is the effect of steel rebars on the weight of a structure?
- Steel rebars have a significant effect on the weight of a structure. Rebars are typically made of steel, which is known for its high strength-to-weight ratio. When incorporated into a structure, these reinforcement bars add strength and rigidity without significantly increasing the overall weight. By reinforcing concrete with steel rebars, the structure becomes better equipped to withstand various forces and stresses, such as tension, compression, bending, and shearing. This reinforcement allows the structure to handle heavier loads and increases its overall durability and longevity. While steel rebars add strength to the structure, they do not significantly contribute to its weight. This is beneficial as it allows for the construction of lighter and more efficient structures. The reduced weight can have several advantages, including lower construction costs, reduced material requirements, decreased transportation costs, and improved seismic performance. Moreover, the use of steel rebars also enables the construction of more slender and aesthetically pleasing structures. The increased strength provided by the rebars allows for the use of thinner concrete sections, resulting in sleek designs and more open spaces. In summary, the effect of steel rebars on the weight of a structure is minimal. Instead, their primary role is to enhance the structural integrity, strength, and durability of the building without adding excessive weight.
- Q:How many patterns are there in threaded steel?
- Rebar is ribbed steel, ribbed steel, including rebar. A ribbed steel bar with 2 longitudinal ribs and uniformly distributed ribs along the length. The transverse rib shape is helical, herringbone, crescent 3. Because of the function of rib, it has better bonding ability with concrete, so it can bear the effect of external force better.
- Q:Can steel rebars be used in high-rise buildings?
- Yes, steel rebars can be used in high-rise buildings. Steel rebars are commonly used as reinforcement in concrete structures, including high-rise buildings, to increase their strength and durability. The use of steel rebars helps to distribute the load and enhance the structural integrity of the building, making them a suitable choice for high-rise construction.
- Q:What is the process of inspecting steel rebars on-site?
- The process of inspecting steel rebars on-site involves several steps. First, the inspector assesses the quality and condition of the rebars by visually examining them for any visible defects such as cracks, rust, or bending. Next, they measure the rebars' dimensions and compare them to the specifications provided by the engineer or project requirements. This ensures that the rebars are of the correct size and shape. The inspector also checks the rebars' placement and alignment within the concrete structure, making sure they are positioned correctly according to the design plans. Additionally, non-destructive testing methods like ultrasound or magnetic particle inspection may be used to detect any hidden defects or flaws in the rebars. The inspector then documents their findings and prepares a detailed report, highlighting any issues or deviations from the required standards. This inspection process helps ensure the strength, durability, and safety of the steel rebars used in construction projects.
- Q:What is the effect of carbonation on steel rebars?
- The effect of carbonation on steel rebars is primarily detrimental. Carbonation refers to the process in which carbon dioxide from the atmosphere reacts with the alkaline compounds in concrete, lowering its pH level. This reduction in pH causes a gradual decrease in the passivation layer of steel rebars, which is a protective layer that prevents corrosion. When the passivation layer is compromised due to carbonation, the steel rebars become more susceptible to corrosion. Carbon dioxide reacts with moisture in the concrete, producing carbonic acid, which further lowers the pH level and accelerates the corrosion process. As corrosion progresses, the steel rebars can lose their structural integrity, compromising the overall strength and durability of the concrete structure. The expansion of corrosion products can also exert pressure on the surrounding concrete, leading to cracking and spalling. This can expose the steel rebars to more moisture and oxygen, exacerbating the corrosion process. Furthermore, carbonation can also reduce the effectiveness of any protective coatings applied on the rebars, making them even more vulnerable to corrosion. To mitigate the effects of carbonation on steel rebars, several preventive measures can be taken. These include using concrete with a lower permeability to carbon dioxide, ensuring proper concrete cover thickness, and using corrosion-resistant steel with a higher level of chromium and/or other alloying elements. Regular monitoring and maintenance of the concrete structures are also essential to detect and address any signs of corrosion at an early stage. In summary, carbonation can have a detrimental effect on steel rebars by compromising the passivation layer, leading to corrosion and weakening of the structure. Therefore, it is crucial to implement preventive measures and regular maintenance to ensure the long-term durability and safety of steel-reinforced concrete structures.
- Q:Can steel rebars be used in bridge rehabilitation projects?
- Yes, steel rebars can be used in bridge rehabilitation projects. Steel rebars are commonly used in the construction and rehabilitation of bridges due to their high strength and durability. They provide reinforcement to the concrete structures, enhancing their load-bearing capacity and extending their lifespan. Additionally, steel rebars are easy to install and effectively resist corrosion, making them suitable for use in bridge rehabilitation projects.
- Q:How do steel rebars impact the overall constructability and scheduling of concrete projects?
- The constructability and scheduling of concrete projects are greatly influenced by the presence of steel rebars. These reinforcing bars are essential for providing strength and stability to concrete structures, ensuring their durability and resilience. To begin with, the inclusion of steel rebars within the concrete significantly improves the overall structural integrity of the project, enhancing its constructability. By reinforcing and supporting the concrete, the rebars enable the construction of taller and more complex structures. They help distribute the load and withstand tension and compression forces, making the project more reliable. Furthermore, the presence of steel rebars facilitates the scheduling of concrete projects. When properly planned and incorporated, the rebars can expedite construction timelines. By integrating the rebars into the concrete formwork, construction teams can efficiently pour and shape the concrete, reducing the curing time required to achieve the desired strength. This directly affects project scheduling, enabling faster construction progress and potential cost savings. In addition, the utilization of steel rebars in concrete projects allows for flexibility in design and construction. The ability to customize the placement, size, and spacing of rebars ensures that the concrete structure meets specific design requirements and intended functionality. This flexibility becomes particularly crucial in projects that involve intricate architectural features or require specific load-bearing capacities. However, it is important to acknowledge that the proper installation and coordination of steel rebars can present challenges in terms of scheduling. To avoid delays, rebar installation must be carefully coordinated with other construction activities. Moreover, quality control measures are essential to ensure the accurate placement and alignment of rebars, as any errors or deficiencies can significantly impact the overall quality and safety of the project. In conclusion, steel rebars have a significant impact on the constructability and scheduling of concrete projects. They enhance the strength and stability of concrete structures, allowing for the construction of more intricate and robust designs. Additionally, the proper incorporation of rebars can expedite construction timelines and provide flexibility in project scheduling. However, careful planning, coordination, and quality control are necessary to ensure the successful integration of rebars in concrete projects.
- Q:Are steel rebars susceptible to rust?
- Steel rebars can be easily affected by rust. Typically composed of carbon steel, rebars contain iron. When they come into contact with moisture and oxygen, the iron reacts and forms rust, also known as iron oxide. The presence of salt or other corrosive materials speeds up this process. The weakening of rebars due to rust formation can eventually cause structural harm if not addressed. Hence, it is vital to safeguard steel rebars by applying a suitable coating or utilizing alternative methods of corrosion prevention. This measure guarantees the durability and structural soundness of reinforced concrete structures.
- Q:What is the average tensile strength of steel rebars?
- The average tensile strength of steel rebars typically ranges from 400 to 600 megapascals (MPa).
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Korea standard hot rolled reinforced bar
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