Mild Steel Reinforcement
Mild steel bars are also known as Fe250 because the yield strength of this steel is 250N/mm2. Although mild steel bars are very ductile, they are not preferred over high yield strength deformed bars because of their less strength and weak bond.
High Yield Strength Deformed Bars
These are also known as HYSD bars. They have higher percentage of carbon as compared to mild steel. Their strength is higher than that of mild steel.
These bars are available as two types:
- Hot rolled high yield strength bars
- Cold worked high yield strength bars
TMT (Thermomechanically Treated) Steel Bars
Among the constituents of R.C.C., steel is the costliest, so focus has been more on steel to make it better and better. TMT steel is new generation, high strength steel having superior properties as compared to common HYSD bars. TMT bars have following advantages
- High Yield Strength
- Better Weldability
- Excellent Ductility
- Superior Corrosion Resistance
CRS (Corrosion Resistance Steel) Bars
The latest development in steel bars is the production of CRS or corrosion resistant steel bars. The carbon content in the CRS bars is 0.18% as compared to 0.2% of HYSD bars. The percentage of corrosion resisting elements such as chromium is as high as 1.5%.
Steel Wire Fabric
Wire fabric is a fabric made by welding or weaving steel wire in the form of a mesh which is also called as steel wire mesh. This mesh is used as reinforcement in slabs, Shells, Pavements and roads etc.
Sometimes for very heavily loaded elements such as foundations and columns rolled sections like rolled steel joists, channels or angles are embedded in concrete and used as reinforcement.