Reinforcing steel bars are used in concrete to assist it in withstanding tension stresses. Concrete is naturally robust enough to withstand compression pressures, but tension forces can cause it to shatter.
Since 1968, deformed rebars on reinforcing steel have been required; however, plain rebars are also utilised when the reinforcing steel is predicted to move. This is common when they are put in highway pavement and segmental bridges. Here are some examples of rebars that are regularly used in construction. Continue reading!
Types of Rebar
There are many different lengths and diameters of rebar, but there are only six typical types: European (a carbon, manganese, silicon, and other alloys); carbon steel (basic “black” rebar); galvanised; epoxy coated; glass-fiber-reinforced-polymer (GFRP); and stainless steel. Each form of rebar has its own set of advantages and disadvantages.
1. Carbon Steel Rebars
This is the most common type of rebar and is sometimes referred to as a “black bar.” It’s incredibly versatile, but it erodes more quickly than other types, making it inappropriate in areas subject to high humidity or structures frequently exposed to water. However, many consider carbon steel rebars the best option in all other types of construction.
2. Sheet-Metal Reinforcing Bars
Sheet metal rebar is used as secondary reinforcement in concrete slabs and walls, beams, columns, and floors. This rebar doesn’t rust, but it’s expensive. These bars are often used in projects that require precise finishing.
3. Epoxy-Coated Bars
These bars are made of carbon steel or GFRP, and they’re coated with epoxy resin. They’re corrosion-resistant, and they withstand weather well. They’re ideal when used in situations where corrosion or abrasion is a significant concern. They’re also an excellent option for indoor structures that have been regularly exposed to water.
4. Stainless Steel Bars
Stainless steel bar is more expensive than other types of steel, and it’s more susceptible to corrosion. However, it has a relatively low coefficient of thermal expansion. This means that it’s better able to withstand high temperatures. It’s also resistant to oxidation, erosion, and stress corrosion cracking.
5. Glass-Fiber-Reinforced Polymer (GFRP) Rebars
Unlike other rebars, a GFRP rebar isn’t heated before it’s inserted into concrete. This is done to ensure that it isn’t exposed to moisture. The rebar is made of a polymer reinforced with glass fibres. GFRP rebar is susceptible to cracking, especially when the humidity is high or when the structure is exposed to vibrations. It has a long service life, and it’s resistant to corrosion. GFRP rebar is ideal in areas subject to corrosion, but it’s not appropriate for areas with low humidity.
6. Galvanized Bars
Galvanised bars are coated with zinc. If a bar is coated with a thinner layer of zinc than required, it’s considered a light-gauge galvanised bar. A heavy-gauge galvanised bar contains a thicker layer of zinc. Galvanised bars corrode less than carbon steel, but they still corrode much quicker than stainless steel.
7. European Alloy Bars
European alloy bars are coated with other metals. The metals are usually steel, zinc, aluminium, manganese, or copper. European alloy bars corrode slower than carbon steel, but they erode faster than stainless steel. These bars are also more susceptible to stress corrosion cracking than other types of rebar.
8. Wire Mesh Rebars
Wire mesh rebar is used when a thick slurry or a high-strength mix is required. It has a coarse mesh and is made of carbon steel or GFRP. It’s lightweight, easy to install, but susceptible to corrosion. These rebars are only suitable for concrete with low cement content. The mesh is made from a high-tensile steel wire.
9. Welded Wire Fabric
Welded wire fabric rebar is made from wires welded together to form a solid structure. This type of bar is strong, but it’s also heavy and difficult to install. For this reason, it’s used primarily for road construction.
Although concrete is extremely strong under compression, it’s susceptible to cracking under tension. To prevent these cracks, reinforcing steel is installed in concrete. This steel acts as tension and compression reinforcement. It also helps to increase the stiffness of a concrete structure. The stiffness makes the structure strong and durable.
Phoenix Reinforcing is a concrete reinforcing business in Queensland that can help you with your reinforcing and building needs. We specialise in reinforcing sales, scheduling and estimating decorative concrete products, and more. Contact us today to learn more about what we can do for you!