Sobha Senior Civil Engineer Interview Questions and Answers

Various types of formwork have been used in my recently worked companies, including timber formwork, steel formwork, and aluminum formwork.

• Timber formwork is commonly used for small to medium-sized projects due to its cost-effectiveness and flexibility.

• Steel formwork is preferred for large and complex structures due to its durability and reusability.

• Aluminum formwork is lightweight and easy to handle, making it suitable for fast-track construction projects.

The thickness for outer and inner walls plastering typically ranges from 12mm to 20mm.

• The thickness of plastering for outer walls is usually around 15mm to 20mm.

• The thickness of plastering for inner walls is typically around 12mm to 15mm.

• The thickness may vary based on the type of wall surface and the desired finish.

• It is important to ensure proper curing and finishing for a durable and aesthetically pleasing result.

The materials required in 1m3 of plastering mortar include cement, sand, and water.

• Cement is typically used in the ratio of 1:4 for plastering mortar.

• Sand is used in the ratio of 3-4 times the amount of cement used.

• Water is added as needed to achieve the desired consistency.

• For example, for 1m3 of plastering mortar, you may need 0.25m3 of cement, 1m3 of sand, and water as needed.

The number of concrete blocks required for 100sft depends on the size of the blocks and the thickness of the wall being built.

• The number of concrete blocks needed can be calculated by dividing the total area (100sft) by the area of one block.

• The size of the concrete block and the thickness of the wall will determine the number of blocks needed.

• For example, if each concrete block is 1ft x 1ft and the wall is 4 inches thick, you would need 100 blocks for 100sft area.

The mix proportion of plastering mortar typically consists of 1 part cement to 3-4 parts sand.

• The mix proportion of plastering mortar is usually 1:3 or 1:4 (cement:sand)

• The mix can also include lime to improve workability and durability

• Water is added to achieve the desired consistency for application

• Example: A common mix proportion for plastering mortar is 1 part cement, 3 parts sand, and water as needed