Overview of Rebar
This deformed steel bar is a common steel reinforcing bar/ used in reinforced concrete and reinforced masonry structures. It is formed from mild steel and is given ribs for better frictional adhesion to the concrete. Deformation of the ribs due to the role of ribs, and concrete have a greater ability to bond, which can better withstand external forces. The deformed steel bar is an iron rod, a weldable plain reinforcing steel bar, and can be used as well for steel meshes. The shape of the transverse ribs is spiral, herringbone, crescent-shaped three. The nominal diameter of the deformed reinforced steel bar corresponds to the nominal diameter of the circular bar of equal cross-section. Reinforced concrete in the main tensile stress.
Specification of Rebar
| HRB335 | Chemical composition | C | Mn | Si | S | P | ||||
| 0.17-0.25 | 1.0-1.6 | 0.4-0.8 | 0.045 Max. | 0.045 Max. | ||||||
| Mechanical Property | Yield strength | Tensile strength | Elongation | |||||||
| ≥335 Mpa | ≥455 Mpa | 17% | ||||||||
| HRB400 | Chemical composition | C | Mn | Si | S | P | ||||
| 0.17-0.25 | 1.2-1.6 | 0.2-0.8 | 0.045 Max | 0.045 Max | ||||||
| Mechanical Property | Yield strength | Tensile strength | Elongation | |||||||
| ≥400 Mpa | ≥540 Mpa | 16% | ||||||||
| HRB500 | Chemical composition | C | Mn | Si | S | P | ||||
| 0.25 Max | 1.6 Max | 0.8 Max | 0.045 Max. | 0.045 Max | ||||||
| Mechanical Property | Yield strength | Tensile strength | Elongation | |||||||
| ≥500 Mpa | ≥630 Mpa | 15% | ||||||||
Types of Rebars
Depending upon the type of material used in the production of rebar, different types of rebars are
l 1. European Rebar
European rebar is made of manganese, which makes them bend easily. They're not suitable for use in areas that are prone to extreme weather conditions or geological effects, such as earthquakes, hurricanes, or tornadoes. The cost of this rebar is low.
l 2. Carbon Steel Rebar
As the name represents, it is made up of carbon steel and is commonly known as Black Bar due to carbon colour. The main drawback of this rebar is that it corrodes, which adversely effect the concrete and structure. The tensile strength ratio coupled with the value makes black rebar one of the best choices.
l 3. Epoxy-Coated Rebar
Epoxy-coated rebar is black rebar with an epoxy coat. It has the same tensile strength, but is 70 to 1,700 times more resistant to corrosion. However, the epoxy coating is incredibly delicate. The greater the damage to the coating, the less resistant to corrosion.
l 4. Galvanized Rebar
Galvanized rebar is only forty times more resistant to corrosion than black rebar, but it is more difficult to damage the coating of galvanized rebar. In that respect, it has more value than epoxy-coated rebar. However, it is about 40% more expensive than epoxy-coated rebar.
l 5. Glass-Fiber-Reinforced-Polymer (GFRP)
GFRP is made up of carbon fibre. As it is made up of fibre, bending is not allowed. It is very resistant to corrosion and is costly when compared to other rebars.
l 6. Stainless Steel Rebar
Stainless steel rebar is the most expensive reinforcing bar available, about eight times the price of epoxy-coated rebar. It is also the best rebar available for most projects. However, using stainless steel in all but the most unique of circumstances is often overkill. But, for those who have a reason to use it, stainless steel rebar 1,500 times more resistant to corrosion than black bar; it is more resistant to damage than any of the other corrosive-resistant or corrosive-proof types or rebar; and it can be bent in the field.
