National Highways & Infrastructure Development Corporation\ Senior Highway Engineer Interview Questions and Answers

Mix design of M20 concrete involves determining the proportions of cement, sand, and aggregate to achieve the desired strength and workability.

• M20 concrete is a commonly used grade of concrete for various construction applications.

• The mix design of M20 concrete typically follows the 1:1.5:3 ratio of cement, sand, and aggregate by volume.

• The water-cement ratio is an important factor in the mix design, affecting the stre...read more

The unit weight of steel varies depending on the type and grade of steel.

• The unit weight of steel is typically measured in pounds per cubic foot or kilograms per cubic meter.

• The unit weight of common structural steel ranges from 490 to 785 pounds per cubic foot (7850 to 12560 kilograms per cubic meter).

• Different types of steel, such as stainless steel or high-strength steel, may have different unit weights.

• The unit wei...read more