Reinforced steel bars have played a major role in the rise of the construction sector by evolving with the demands of the construction sector to provide safer buildings. The use of steel bars as reinforcement started from the 19th century. The rising demands led to the innovation of technologies that refined steel reinforced bars, used for constructing structures. One such innovation is the TMT processed steel bars. TMT steel bars that provided higher tensile strength and optimum ductility to withstand the forces of nature quickly became the most preferred material for reinforcement in the construction field. There are different grades available for TMT reinforced steel namely Fe 415, Fe 500, Fe 550, Fe 600 in accordance with the tensile strength the grades can deliver
Handling importance of TMT
In order to prevent any compromise in the TMT steel bars for construction, reinforced bars must be handled and stored with precaution. Proper handling of the TMT bars is essential for its efficiency. Handling the TMT Re-bars at construction sites involve different operations namely – Unloading, Hoisting, Stacking, Cutting, Bending, Fabrication, Welding etc. Since TMT steel rebar plays a crucial role in maintaining the structural integrity and durability of the building, it is essential all these operations are properly maintained at the construction site.
In order to maintain the quality of the TMT steel, proper use of these operations is very essential. Steel is generally sensitive to water moisture and dust. So, if the rebars are handled carelessly, there is a high probability that the steel can come in direct contact with any one of them or both. Even though TMT bars have resistance to corrosion, storage and handling of TMT bars should be so handled to minimise leaving them in exposed conditions to natural elements for a prolonged time.
Methods for storage of TMT bars
Normally TMT reinforced steel bars are transported to the construction sites by trucks as lots. Following certain methods for the handling and storage will save time and effort along with ensuring the 100 % efficiency of the reinforced steel.
- Whenever the rebars are ordered, the area where it must be unloaded must be moisture and dust free. Also at the time of unloading, use timber beds in order to avoid contact with dirt and water.
- Covering the steel rebars with polythene sheets will protect the reinforced bars from moisture. Alternatively, a covered shed can be used.
- Maintain the stockpiles orderly and store them according to their sizes and lengths separately for easy identification.
- Optimize the stacking height for the reinforced bars. The more the stacking height, the more load bars will have to endure at the lower layers. The excessive load may damage the Ribs on the surface of the rebar, which in turn reduces tensile strength.
- Coating the reinforced steel with cement washes before stacking prevents scaling and rusting. If the rebars are stored for long-term, then stack it above ground level by at least 150 mm.