STANDARD WEIGHT OF 1 METER OF TMT STEEL BAR

Steel weight calculation

Standard weight of steel bars in KG/Meter is calculated by using this formula

(D)^2/162

EX:- The weight of 8 mm bar of 1 meter length is 

(8X8)/162 = 0.39 KG/Meter

similarly the weight of bars as follows:

STANDARD WEIGHT OF 1 METER STEEL BAR:

Bar Diameter	Weight /Meter
6	0.22 kg/m
8	0.39 kg/m
10	0.62 kg/m
12	0.88 kg/m
16	1.58 kg/m
18	2 kg/m
20	2.47 kg/m
24	3.55 kg/m

Note:

Length of TMT Steel rod will be 12 meter (or) 40 feet.

Weight Tolerance:

· 8mm and 10mm: ± 7%

· 12mm to 16mm: ± 5%

· 20mm to 32mm: ± 3%

Tolerance is given with adherence to IS:1786-2008 standard law.

TMT bars per bundle: 

TMT SIZE (mm)	RODS PER BUNDLE
6	20 No / Length
8	10 No / Length
10	8 No / Length
12	5 No / Length
16	3 No / Length

UNIT WEIGHT OF STEEL BAR PER METER

Diameter of bar	Weight (kg/m)	Weight (kg/ft)
6 mm	0.22 kg/m	0.068 kg/ft
8 mm	0.395 kg/m	0.12 kg/ft
10 mm	0.616 kg/m	0.19 kg/ft
12 mm	0.88 kg/m	0.27 kg/ft
16 mm	1.578 kg/m	0.48 kg/ft
20 mm	2.466 kg/m	0.75 kg/ft
25 mm	3.853 kg/m	1.172 kg/ft

 By using the formula D²/162 we calculate the unit weight of steel bar per meter

 By using the formula D²/533 we calculate the unit weight of steel bar per meter

Note:

Length of TMT Steel rod will be 12 meter (or) 40 feet.

What Is Unit Weight?

Unit weight of any substance is defined as the ratio of mass or weight per unit volume. It is usually measured in gm/cm, lb/ft,  or, kg/cm or kg/m etc.

The unit weight of materials varies depending on their composition & properties of ingredients. It gives an idea about the weight or lightness of the materials.

What Is Unit Weight of Steel?

The density of steel is around 7850 kg/m³ (or) 7.85 g/cm³ (or) 490 lbs/ft³ (or) 13231 lbs/yd³.

The various steel diameters used in construction are 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 32 mm and 40 mm.

The Formula Used To Calculate Weight of Steel

The formula used to calculate the unit weight of steel bars is D²/162.                 Where, D = Diameter of steel bars, 162 is a constant value.

Derivation of formula for calculating unit weight of steel

Derivation of Formula for Calculating Unit Weight of Steel

 Derivation of Formula for Calculating Unit Weight of Steel

 As we know the density of steel = 7850 kg/ m³

Weight of steel per metre  = Volume × Density [ Volume = Area × Length ]

= π/4 x d²× 1000 × 7850 kg/m³ (length = 1000 mm)

= 0.785 × d²× 1000 × 7850 kg / (1000 × 1000 × 1000) [ 1 metre = 1000 mm ]

= 785 x d²× 0.00000785

=  d²/1 × 0.00616225 /1

=  d²/1/0.00616225

=  d²/162.27 ≈

= d²/162 kg/m (say)

So the Formula for unit weight of steel in kg/meter is = d²/162

 

Unit Weight of steel bar per feet = d²/(162.27 x 3.28084)    ( 1 metre = 3.28084 feet)

= d²/532.38 ≈

= d²/533 (say)

=d²/533 kg/feet

 

How do you Calculate the Unit Weight of Steel Bars?

With the help of the formula d²/162 (d is the diameter of the steel bar), we can calculate the unit weight of the steel bars, and it will give us weight in kg per meter. And the formula d²/533 will provide us with weight in kg per foot.

 

 

GRADES OF CONCRETE

 Nominal Mix Concrete:

Grades of Concrete	Mix Ratio Cement:Sand:Aggregate	Compressive strength of 150 mm cube at 28 days cured MPa (N/mm2)     Psi
M5	1:5:10	5 Mpa	725 Psi
M7.5	1:4:8	7.5 Mpa	1087 Psi
M10	1:3:6	10 Mpa	1450 Psi
M15	1:2:4	15 Mpa	2175 Psi
M20	1:1.5:3	20 Mpa	2900 Psi
M25	1:1:2	25 Mpa	3625 Psi
M30 and above	Design Mix	30 Mpa	4350 Psi

Grades of Concrete as per IS 456:

Group	Grade Designation	Specified Characteristic Compressive strength of 150 mm cube at 28 days in N / mm2
Ordinary concrete	M10	10
	M15	15
	M20	20
Standard Concrete	M25	25
	M30	30
	M35	35
	M40	40
	M45	45
	M50	50
	M55	55
High Strength	M60	60
	M65	65
	M70	70
	M75	75
	M80	80

Note:  

(1) M5 and M7.5 Grades may be used for lean concrete bases and simple foundations for masonry walls. These mixes need not be designed.

(2) Grades lower than M15 shall not be used in reinforcement concrete.

Different Grades of Concrete -- Concrete Mix Design