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Monday, November 25, 2013

SIZE AND QUANTITY OF REINFORCEMENT FOR BUILDING WORKS




Reinforcement is required for reinforced concrete members such as footings, beams, columns, slabs, lintels etc. Estimation of reinforcement quantity is required prior to tendering stage to calculate approximate cost of project or construction work.

Following table gives the estimated quantities of reinforcement and its size generally used for various building works:
Steel reinforcement for RCC members
Sl. No
RCC Member
Quantity in kg/m3
Size of reinforcement required
1
Column footings
75
10mm  or 12mm
2
Grade beams
100
12mm, 16mm – 85%
Stirrups – 6mm or 8mm– 15%
3
Plinth beams
125
8mm diameter – 85%,
Stirrups 6mm – 15%
4
Columns
225
16mm, 20mm and 25mm – 90%
Ties – 6mm or 8mm – 10%
5
Lintel beam
125
12mm, 16mm dia – 85%
Stirrups – 6 mm or 8mm – 15%
6
Sunshades
60
8mm dia – 75%
Distributer – 6mm – 25%
7
Canopy slab upto 2.0 m span
125
10mm dia – 80%
Distributor bars – 6mm or 8mm – 20%
8
Staircase waist slab
150
12 or 16mm dia – 80%
Distributor 8mm dia – 15%
9
Roof slab



(a)  One way slab
80
8mm dia – 70%
Distributor – 6mm – 30%

(b)  Two way slab
100
8mm dia – 100%

(c)  Square slab – 4m to 6m size
150
10 – 12mm dia – 100%
10
Main beams above 6m
250
20mm, 16mm, 12mm – 80 – 85%
Stirrups – 8mm – 15 – 20%

All above mentioned steel are round tapered steel. This data is just for estimation of quantity of steel for various RCC works. This does not provide actual steel required for all the members. Actual quantity of steel required can be calculated from the drawings prepared after structural design.
1. Read more posts on Reinforcement Guide
2. Read More posts on Material Estimation Guide

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