Important points of Civil Engineer

1.)  POINT OF CONTRAFLEXURE: 

The point of Contraflexure is a point whese Bending Moment changes its sign (BM is zero). 

 2.) GRADE OF CONCRETE & MIX PROPORTION: 

               C:S:A 

1.) M-75 1:4:8 

2.) M-10 1:3:6 

3.) M-15 1:2:4 

4.) M-20 1:1-5 :3 

5.) M-25 1:1:2 3. 

Notes:- C:S:A° C-- Cement, S---Sand, 

A--- Aggregate

3) MINIMUM CLEAR COVER: 

As per IS Code 456:2000

a} Footing = 40mm

b} Column = 50 mm 

c} Slab & stairs = 15 mm 

d} Beam  = 25 mm 

4.) DENSITY 

i} R.C.C = 2500 kg/m³

ii} Steel - 7850 kg/m³ 

iii} Brick = 1600 - 1920 kg/m³ 

iv} PCC= 2400 kg/m³ 

v} Cement = 1440 kg/m³