USHA International Interview Questions and Answers

OPC is Ordinary Portland Cement and PPC is Portland Pozzolana Cement.

• OPC is made from clinker and gypsum while PPC is made from clinker, gypsum, and pozzolanic material.

• PPC has higher durability and strength than OPC.

• PPC is more eco-friendly as it requires less energy to produce.

• OPC is commonly used for general construction while PPC is used for structures that require high strength and durability.

• PPC is also more resistant to chemical attacks and has a lower heat of hydratio...read more

Standard brick size is 190mm x 90mm x 90mm and nominal brick size is 200mm x 100mm x 100mm.

• Standard brick size is also known as actual brick size.

• Nominal brick size is the size specified by the manufacturer.

• Standard brick size is smaller than nominal brick size.

• Standard brick size is used for calculation of brickwork.

• Nominal brick size is used for estimation of materials required.

Minimum cover block sizes for footings, columns, beams, and slabs are essential for durability and strength.

• Minimum cover block size for footings is 50mm

• Minimum cover block size for columns is 40mm

• Minimum cover block size for beams is 25mm

• Minimum cover block size for slabs is 20mm

Initial setting time is the time taken by concrete to harden to a certain degree, while final setting time is the time taken for it to completely harden.

• Initial setting time is typically around 30 minutes to 1 hour

• Final setting time is typically around 4 to 6 hours

• Factors affecting setting time include temperature, humidity, and type of cement used

Different tests for cement and concrete include compressive strength test, water absorption test, setting time test, and soundness test.

• Compressive strength test measures the ability of cement or concrete to withstand pressure

• Water absorption test measures the amount of water absorbed by cement or concrete

• Setting time test measures the time taken for cement or concrete to set

• Soundness test measures the ability of cement or concrete to resist volume changes due to hydration

• Oth...read more

Extra bars are provided to beams for reinforcement and to increase their load-bearing capacity.

• Extra bars help to prevent cracking and failure of the beam under heavy loads.

• They also improve the ductility and toughness of the beam.

• Extra bars are added based on the design requirements and load calculations.

• They are usually placed at the bottom of the beam to resist tension forces.

• Examples of extra bars include stirrups, links, and longitudinal bars.

The minimum depth of slab depends on various factors such as load, span, and type of slab.

• The minimum depth of slab is generally 4 inches for residential buildings.

• For commercial buildings, the minimum depth of slab is around 6 inches.

• The depth of slab also depends on the type of slab, such as one-way or two-way slab.

• The span of the slab and the load it will bear also affect the minimum depth.

• The minimum depth of slab can be calculated using various formulas and codes such as...read more

Frog is provided to the brick to prevent cracking and improve strength.

• Frog creates a void in the brick which reduces the weight and improves insulation.

• Frog also helps in better bonding of the mortar with the brick.

• It prevents cracking by allowing the brick to expand and contract without breaking.

• Frog also improves the strength of the brick by distributing the load evenly.

• Example: Hollow bricks have larger frogs to increase insulation and reduce weight.