Acivcrete Basics - #2

REINFORCEMENT REQUIREMENT IN COLUMNS

--Minimum % of steel=0.8% of gross cross section area.
--Maximum % of steel=4% of gross cross section area and should not exceed 6%.
--Minimum number of rods in circular and rectangular/square columns are 6 and 4 respectively.
--Minimum diameter of bar=12 mm.
--Bars spacing shall exceed 300 mm along periphery.
--For pedestals minimum area of reinforcement=0.15% of gross cross sectional area.

-Minimum Grade of Concrete for Liquid storage structures is M30.(as per IS 3370(Part 1):2009-Code of practice for storage of liquids)
-Minimum cement content is 320 kg/m3.
-Maximum cement content is 400 kg/m3.


REINFORCEMENT REQUIREMENT IN SLABS:-

-0.15% for Fe 250 grade of steel 
-0.12% for Fe 415 grade of steel.