Permissible Stresses In Concrete (IS 456 – 2000) (ALL Values IN N/mm2)
Note: - Density of steel is 7850 kg/m3
|
Grade of Concrete
|
Permissible
Stress in Shear
|
Permissible
Stress in Compression
|
Permissible
Stress in Bond (Avarage) for deformend bars in Tension
|
||
|
For
100 AS
bd
=0.25
|
For
100 AS
bd
=0.50
|
Bending
|
Direct
|
||
|
M 10
|
----
|
-----
|
3.0
|
2.5
|
----
|
|
M 15
|
0.22
|
0.29
|
5.0
|
4.0
|
0.96
|
|
M 20
|
0.22
|
0.30
|
7.0
|
5.0
|
1.28
|
|
M 25
|
0.23
|
0.31
|
8.5
|
6.0
|
1.44
|
|
M 30
|
0.23
|
0.31
|
10.0
|
8.0
|
1.60
|
|
M 35
|
0.23
|
0.31
|
11.5
|
9.0
|
1.76
|
|
M 40
|
0.23
|
0.32
|
13.0
|
10.0
|
1.92
|
|
M 45
|
0.23
|
0.32
|
14.5
|
11.0
|
2.08
|
|
M 50
|
0.23
|
0.32
|
16.0
|
12.0
|
2.24
|
Note: - The bond value shall be increased by
25% for bars in compression
NOMINAL CONCRETE
MIXES REQUIREMENT OF MATERIALS PER M3 OF CONCRETE
|
Proportion
|
Cement in bags of
50 Kg
|
Sand m3
|
Coarse
aggregates m3
|
|
1 : 1 : 2
|
11.25
|
0.40
|
0.79
|
|
1 : 1.5 : 3
|
8.10
|
0.43
|
0.86
|
|
1 : 2 : 4
|
6.35
|
0.45
|
0.90
|
|
1 : 2.5 : 5
|
5.20
|
0.46
|
0.92
|
|
1 : 3 : 6
|
4.50
|
0.48
|
0.95
|
|
1 : 4 : 8
|
3.45
|
0.49
|
0.98
|
|
1 : 5 : 10
|
2.80
|
0.49
|
0.98
|
Note: - 20mm MSA & 30
to 80mm Slump ± 0 to 30mm Slump
|
Assumed
Specific Gravity
|
: 2.69 (Sand) & 2.80 (Coarse aggregate)
|
|
Assumed
Loose Density kg/m3
|
: 1450 (Sand) & 1400 (Coarse aggregate)
|
|
Bulk
age for wet sand and wastage for sand & coarse aggregate has not been
considered
|
|
AREA PERIMETER AND
WEGHT OF STEEL ROUNDS
|
B Bar Diameter
(mm)
|
Area of Cross
Section (Sq.cm)
|
Perimeter (cm)
|
Weight in kg per
sq Meter
|
|
32
|
8.04
|
10.05
|
6.314
|
|
28
|
6.16
|
8.80
|
4.836
|
|
25
|
4.91
|
7.86
|
3.855
|
|
22
|
3.80
|
6.91
|
2.985
|
|
20
|
3.14
|
6.29
|
2.467
|
|
16
|
2.01
|
5.03
|
1.579
|
|
12
|
1.13
|
3.77
|
0.888
|
|
10
|
0.79
|
3.14
|
0.617
|
|
8
|
0.50
|
2.51
|
0.395
|
|
6
|
0.28
|
1.89
|
0.222
|
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