Reinforced concrete is a popular structural material that is utilized extensively in construction engineering. Concrete is very powerful to withstand compressive stress but it is weak in tension. In order to combat tensional stresses, steel is required in concrete. The reinforcement in concrete refers to simple bars or rods bend and connected to a specified schedule with stirrups. The minimal diameters of bars which are utilized at site were Y10, Y12, Y16, Y20, Y25 and R6.
Steel is available in two basic types.
1. Mild steel (250 N/mm2)
2. Tor steel (460 N/mm2)
Implication of Reinforcement in Drawings
Engineering drawings is a language to disclose information thoroughly. So, there is a standard like 5Y10- 001- 150 to specify reinforcement in drawing such as, 5Y10- 001- 150:-It signifies 5 Number of Tor steel, 10mm Diameter, Bar mark 001, At 150mm CRS. At bottom face.
Bar location is changeable as below:
Notation for Slab :-
T1 -Top outer layer, T2 -Top second layer
B1 -Bottom outer layer, B2 -Bottom second layer
Cutting and Bending of Bars Reinforcement bars are preserved, sliced and bent in a steel yard in the site. Reinforcement bars are sliced into the desired lengths and bent into requisite shapes demonstrated on the bar schedule either by hand or through machinery.
Under manual processes, laborers applied the bar bending bench upon which robust nails and GI pipes are set with proper lengths to bend the bars for being utilized for smaller diameter bars. The larger diameter bars are bent through bar bending machine. Once the bending process is completed, all reinforcement bars are stacked and perfectly numbered as stated by the bar mark to avoid any issue at the time of fixing them.
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