B. G. Shirke Construction Technology Assistant Engineer - Civil Interview Questions and Answers

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

Self compacting concrete is a type of concrete that does not require vibration or compaction during placement.

• Contains high flowability and segregation resistance

• Achieves full compaction purely through its own weight and without the need for mechanical vibration

• Ideal for complex structures with congested reinforcement or in areas with limited access

• Reduces labor costs and construction time

• Examples include SCC mixtures ...read more

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 an...read more

w/c ratio stands for water-cement ratio, it is the ratio of the weight of water to the weight of cement used in a concrete mix.

• w/c ratio is a crucial factor in determining the strength and durability of concrete.

• A lower w/c ratio indicates a stronger and more durable concrete mix.

• The w/c ratio should be carefully controlled to achieve the desired concrete properties.

• For example, a w/c ratio of 0.5 means that for every

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...read more

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

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

• Ot...read more