Om Shivam Buildcon Junior Engineer Civil Interview Questions and Answers

Development length is the length of reinforcement required to transfer the stress from steel to concrete. Lapping length is the length of overlap required for two reinforcement bars to transfer stress.

• Development length is influenced by factors like bar diameter, concrete strength, bond strength, etc.

• Lapping length is necessary to ensure continuity of reinforcement along the length of the structure.

• Example: For a 20mm ...read more

Concrete grades are classifications based on the compressive strength of the concrete mix.

• Concrete grades are denoted by the letter 'M' followed by a number, such as M20, M30, etc.

• Higher numbers indicate higher compressive strength, with M20 being weaker than M30, and so on.

• Common concrete grades include M20, M25, M30, M35, M40, M45, M50, and higher.

• Different grades are used for different types of construction projects

The length of a bar can be calculated using the formula L = L0 + αL0ΔT

• Length of bar (L) can be calculated using the formula L = L0 + αL0ΔT

• L0 is the initial length of the bar

• α is the coefficient of linear expansion

• ΔT is the change in temperature

• Example: If L0 = 10m, α = 0.000012/°C, ΔT = 50°C, then L = 10 + (0.000012*10*50) = 10.06m