# Some vital information and formulas for Civil engineer

In this construction video tutorial, brief explanation is given on various topics like weight of steel per meter, standard conversion factors, concrete grade and weight of engineering materials. These informations are very useful for civil engineers.

Weight of steel per meter :-

For 6 mm steel the weight is 0.222 kg

For 8 mm steel the weight is 0.395 kg

For 10 mm steel the weight is 0.616 kg

For 12 mm steel the weight is 0.888 kg

For 16 mm steel the weight is 1.578 kg

For 20 mm steel the weight is 2.466 kg

For 25 mm steel the weight is 3.853 kg

For 32 mm steel the weight is 6.313 kg

For 40 mm steel the weight is 9.865 kg

The unit of steel is determined with the use of the following formula :-

D^{2}/162

Standard Conversion Factors :-

1 inch = 25.4mm

1 feet = 0.3048 m

1 yard = 0.9144 m

1 meter = 3.28 ft

1 mm = 0.0394 inch

1 mile = 1.6093 km

1 newton = 0.10 kg

Concrete Grade Ratio:- As per ACI standard the following ratios should be maintained for different types of concrete grades.

For M5 concrete grades, the ratio should be 1:4:8 (Cement : Sand : Aggregate)

For M10 concrete grades, the ratio should be 1:3:6 (Cement : Sand : Aggregate)

For M15 concrete grades, the ratio should be 1:2:4 (Cement : Sand : Aggregate)

For M20 concrete grades, the ratio should be 1:1.5:3 (Cement : Sand : Aggregate)

For M25 concrete grades, the ratio should be 1:1:2 (Cement : Sand : Aggregate)

Here, M denotes Mix and M15 means the strength of concrete gained after 28 days as 15N/mm2 (N = newton)

Weight of engineering materials :-

Bitumien = 1340 kg/m^{3}

Cement = 1440 kg/m^{3}

Cast Iron = 7650 kg/m^{3}

Steel = 7850 kg/m^{3}

Ice = 913 kg/m^{3}

Petrol = 690 kg/m^{3}

Water = 1000 kg/m^{3}

To get more information, watch the following video tutorial.

Video Source: Sami Ullah Stanikzai