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The price of ribbed reinforcement steel bars can vary, depending on the kind required for a building project. Reinforcement steel bars, popularly known as rebar, come in various forms based on the composition of the alloy used to make them. The types are as follows:
Carbon steel rebars
These are the most common type and are used in most construction projects. They are durable and cheap, but they are also prone to rust if not properly coated or if used in a high-moisture environment.
Stainless steel rebars
Although they are extremely durable and corrosion resistant, making them ideal for use in marine environments and concrete structures exposed to high moisture, this costly option is rarely used unless absolutely necessary.
Epoxy-coated steel rebars
Acid-resistant coating rebars are more affordable than stainless steel rebars but still offer decent protection against corrosion. They are commonly used in bridges, parking garages, and other structures exposed to moisture and chemicals.
Galvanized steel rebars
This is a less common type that provides a coating of zinc over the steel to protect it from corrosion. It is similar to the epoxy-coated rebar in terms of cost and application.
Fiberglass rebars
Also known as FRP rebar, it is a non-metallic alternative to steel rebar. It is lightweight, non-corrosive, and has lower thermal conductivity than metal rebars. It is ideal for use in marine and other corrosive environments where steel rebar would deteriorate too quickly.
High-strength rebars
These are made from special steel alloys containing nickel and chromium, giving them higher tensile strength than regular carbon steel rebars. Although quite expensive, they are often used in large construction projects requiring extremely durable reinforcement.
Rebar diameter
The most common variations are 10 mm, 12 mm, 16 mm, 20 mm, and 32 mm. Larger diameters require more steel and hence are more expensive than smaller ones. For instance, 32 mm bars have the highest tensile strength and are frequently applied where structural reinforcement is critical, such as in marine concrete and seismic-resilient structures.
Rebar shape
Rebars typically come in round shapes because the circular cross-section distributes pressure evenly. However, some specialty rebars come in different geometric shapes, like square or star-shaped. These are more expensive to manufacture and thus increase the overall cost.
Rebar length
Most rebars are manufactured in standard lengths, commonly 12 meters, although they can be custom cut the required length. Longer rebars necessitate more steel and sometimes extra processing to transport, increasing the ribbed rebar price. Custom-length rebars may also be more expensive due to the specialized cutting. For example, 16 mm rebar that is needed for moderate loads in thin concrete slabs often comes in flexible lengths that can be cut to size. Longer rebars are needed for large structural concrete works. Because they can be cut to size, longer rebars are more expensive due to the added processing.
Rebar coating
Steel rebar can be uncoated or have different coatings to boost durability and corrosion resistance: zinc galvanization, epoxy polymer, fiberglass, and other high-tech coatings. Uncoated rebar is the cheapest, while advanced composite-coated rebar costs the most. Among the coated rebars, galvanised rebars are the most economical. Composite rebars are more budget-friendly than galvanised rebars but do not offer as much tensile strength as the latter.
Reinforcement mesh
The main alternative to rebar is reinforcement mesh. Reinforcement wire mesh is cheaper but has less tensile strength and is less versatile because it only comes in fixed grid patterns. Reinforcement mesh is frequently used for shallow concrete applications like pavements, walkways, and slabs. They need inexpensive kinds of rebar because they do not need high strength. Reinforcement mesh is economical for thin concrete because it distributes loads over a wide surface area, miniising cracking even when uses low-strength rebar.
Concrete structures
Reinforced concrete is used to make the floors, walls, and ceilings of buildings, bridges, dams, roads, and other civil infrastructure. The tensile strength of steel rebars allows concrete to withstand pulling forces and internal stresses without cracking or collapsing.
Suspension bridges
Steel rebars are key components of the main cables and deck slabs of suspension bridges, allowing them to flex safely while bearing heavy loads. The rebars help distribute forces throughout the structure evenly, increasing stability and longevity.
Soil retention systems
Soil nails and tie-back anchors are steel rebars inserted into the ground to reinforce excavations, retaining walls, and tunnels. The rebars stabilize these vertical supports by anchoring them into the surrounding soil layers, preventing collapse and landslides.
Earthquakes
In seismic regions, reinforced concrete shear walls and moment-resisting frames use rebars to make buildings and bridges more earthquake-resistant. The rebars help absorb and redistribute lateral seismic forces, preventing structural failures such as cracking and collapse.
Pre-stressing
Pre-tensioned and post-tensioned concrete members, like beams and slabs, employ rebars under tension to improve their load-carrying capacity. This allows longer spans without intermediate supports while reducing cracking and increasing fatigue resistance. Examples include bridges, parking garages, and high-rise buildings.
Industrial floors
Heavy machinery and dynamic loads necessitate reinforced concrete floor slabs with rebars for warehouses, factories, and airport hangars. The rebars prevent cracking and sagging in these heavily stressed horizontal surfaces.
Cofferdams
Temporary coffer dams use rebars to create watertight enclosures for foundation work below water level, like piers and dredging. The rebars reinforce the walls of these retaining structures against hydrostatic pressure.
Types of steel bars and grades
The strongest steel bars for concrete in buildings are those made with high-strength steel alloys with carbon, manganese, chromium, and nickel added.
Corrosion resistance
Concrete deteriorates more rapidly in damp, humid, or chemical environments such as marine locales. It therefore requires galvanized, epoxy-coated, or corrosion-resistant composite steel bars.
Bonding ability
Concrete surrounds the steel bars tightly to keep them from moving when loads bend or shear the slab. The steel bar surface needs ribs or an anti-slip coating so the concrete securely grips it in all situations.
Chemical composition
The steel bar should be made of electrolytic-grade carbon steel that contains no harmful chemicals that could reduce the concrete's bonding ability to the rebar. Billets for steel bars from different countries sometimes have chemicals that are not ideal for concrete.
Tensile strength
A steel bar's tensile strength measures how much pull or tension it can withstand without breaking. It must be strong enough to resist bending or snapping under loads without exceeding the concrete's tensile strength and causing cracking.
Workability
The steel bar should be easy to bend and shaped without fracturing so it can be placed custom-fit to architectural design elements, sloped ceilings, and other unique situations.
Price
Less expensive steel bars also contain fewer alloys and may not bond as well or resist corrosion as effectively. The rebar selected needs to be affordable yet meet performance needs. Sometimes city codes or practical engineering factors require higher-quality, stronger, or more corrosion-resistant bars regardless of cost.
A1. These are steel reinforcement bars with a ridged surface that improves bond strength with surrounding concrete.
A2. The ribs on steel rebars provide better grip and resistance to slippage, resulting in stronger concrete structures.
A3. Sizes typically range from 8 mm to 32 mm in diameter, accommodating different load requirements and construction needs.
A4. They are usually made from high-strength steel alloys via hot rolling process, which enhances their tensile strength and ductility.
A5. Yes, grades like Fe 415, and 500 provide varying yield strengths, with higher numbers indicating greater load-bearing capacity in masonry.
