Site Engineer Civil or Civil Designer Interview Questions and Answers

The grades of concrete refer to the strength and quality of the concrete mixture.

• Concrete grades are denoted by a number followed by the letter 'M', which stands for mix.

• The number represents the compressive strength of the concrete in megapascals (MPa).

• Common grades of concrete include M10, M15, M20, M25, M30, M35, M40, M45, M50, M55, M60, and M70.

• For example, M20 concrete has a compressive strength of 20 MPa.

• Higher grade concrete is generally used for structures that requir...read more

Unit weight of steel and concrete are important parameters in civil engineering.

• Unit weight of steel is typically around 7850 kg/m³.

• Unit weight of concrete varies depending on the mix design, but it is generally around 2400 kg/m³ to 2600 kg/m³.

• Unit weight is used to calculate the weight of structural elements and to determine the load-carrying capacity of structures.

• Knowing the unit weight helps in designing and analyzing structures for stability and safety.

The grade of concrete refers to its strength and is determined by the ratio of cement, sand, and aggregate used in the mix.

• The grade of concrete is denoted by a number followed by the letter 'M', such as M20 or M30.

• The number in the grade represents the compressive strength of the concrete in megapascals (MPa) after 28 days of curing.

• The ratio of cement, sand, and aggregate varies for different grades of concrete.

• For example, in M20 grade concrete, the ratio of cement:sand:ag...read more

Foundations are the base of any structure and are classified into shallow and deep foundations.

• Shallow foundations include spread footings, mat foundations, and slab-on-grade foundations.

• Deep foundations include pile foundations, drilled shafts, and caissons.

• The type of foundation used depends on the soil conditions, load-bearing capacity, and the type of structure being built.

• For example, a high-rise building may require a deep foundation while a small residential house may ...read more