Assistant Engineer - Civil Interview Questions and Answers for Freshers

Hydration process is the chemical reaction between cement and water which results in the hardening of concrete.

• Hydration process starts as soon as water is added to cement.

• The reaction produces heat and causes the mixture to harden and gain strength.

• The process continues for weeks and even months, resulting in a stronger and more durable concrete.

• The amount of water used in the mixture affects the hydration process and the strength of the final product.

• Proper curing is necess...read more

BBS stands for Bar Bending Schedule. Weight of a bar can be calculated using the formula: Weight = (D^2/162) * L, where D is diameter of bar in mm and L is length of bar in meters.

• BBS stands for Bar Bending Schedule

• Weight of a bar can be calculated using the formula: Weight = (D^2/162) * L

• D is diameter of bar in mm

• L is length of bar in meters

Nominal mix is a pre-defined mix ratio while design mix is a mix ratio calculated based on specific requirements.

• Nominal mix uses pre-determined ratios like 1:2:4 for concrete, while design mix is calculated based on specific requirements like strength and durability.

• Design mix involves testing of materials to determine the optimal mix ratio, while nominal mix does not require such testing.

• Design mix is more precise and ensures better quality and strength of the concrete comp...read more

Water is added to concrete mixer to make the mixture more workable and to achieve the desired consistency.

• Water is added to hydrate the cement and activate the chemical reaction that causes it to harden

• The amount of water added affects the strength and durability of the concrete

• Too much water can weaken the concrete and cause cracking

• The water should be added gradually and mixed thoroughly to ensure even distribution

• Other additives such as admixtures may also be added to impr...read more

The grade of concrete determines its compressive strength.

• The grade of concrete is denoted by a number, such as M20 or M30.

• The compressive strength of concrete is measured in megapascals (MPa).

• The higher the grade of concrete, the higher its compressive strength.

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

• Bricks do not have a specific compressive strength grade like concrete.

Concrete strength depends on various factors.

• Water-cement ratio

• Type and quality of cement

• Aggregate size and shape

• Curing conditions

• Mix design

• Age of concrete

• Temperature and humidity

• Presence of admixtures