Badri Rai Construction Senior Site Engineer Interview Questions, Process, and Tips

Development length is the length of reinforcement required to transfer the stress from steel to concrete.

• It is the minimum length of reinforcement bar required to be embedded in concrete to develop its full strength.

• It is influenced by the diameter of the bar, the grade of the steel, and the strength of the concrete.

• It is calculated based on the bond strength between steel and concrete.

• For example, if the development l...read more

The minimum thickness of an RCC slab depends on various factors such as span, load, and deflection criteria.

• The minimum thickness of an RCC slab is typically determined by structural engineers based on the span of the slab.

• The thickness also depends on the load that the slab needs to support. Heavier loads require thicker slabs.

• Deflection criteria, which refers to the amount of bending or sagging the slab can tolerate,...read more

The number of cement bags in one cubic metre depends on the density of the cement.

• The density of cement varies between 1,200 to 1,800 kg/m³

• The weight of one cement bag is usually 50 kg

• Therefore, the number of cement bags in one cubic metre ranges from 55 to 83 bags

Density of aggregate is the mass per unit volume of the material.

• Density is an important property of aggregates used in construction.

• It is measured in kg/m³ or lb/ft³.

• The density of different types of aggregates varies depending on their composition.

• For example, the density of granite aggregate is around 2.7 g/cm³.

• The density of lightweight aggregates like expanded clay or shale is around 1.5 g/cm³.

The nominal size of a concrete cube is 150 mm.

• The nominal size of a concrete cube is the length of one side of the cube.

• It is used to test the compressive strength of concrete.

• The standard size of a concrete cube is 150 mm, but other sizes can also be used.

• The cubes are made and cured under controlled conditions before testing.

Weight of 16 mm dia steel in one metre

• The weight of 16 mm diameter steel rod per metre can be calculated by using the formula D^2/162

• Here, D is the diameter of the steel rod in millimeters

• So, the weight of 16 mm diameter steel rod per metre is (16^2)/162 = 1.580 kg/m

The minimum diameter of steel used in a slab depends on the span, load, and thickness of the slab.

• The minimum diameter of steel bars used in a slab is usually 8mm.

• However, for longer spans and heavier loads, larger diameter bars may be required.

• The thickness of the slab also affects the minimum diameter of steel used.

• For example, a 100mm thick slab may require 10mm diameter bars.

• The minimum diameter of steel used in a

The minimum diameter of steel used in a column depends on the load it needs to bear and the height of the column.

• The minimum diameter of steel used in a column is typically 12mm.

• However, it can vary depending on the load it needs to bear and the height of the column.

• For taller columns, larger diameter steel bars may be required to ensure structural stability.

• The diameter of steel used in a column should be specified in...read more

The ratio of M15 is 1:2:4 (cement:sand:aggregate) for concrete mix.

• M15 is a mix of concrete with a compressive strength of 15 N/mm².

• The ratio of M15 is commonly used for residential construction.

• The ratio of M15 can be adjusted based on the specific requirements of the project.