Segmental Consulting & Infrastructure Advisory Assistant Quality Material Engineer Interview Questions and Answers

There are mainly four grades of bitumen commonly used in construction: VG-10, VG-20, VG-30, and VG-40.

• VG-10: Suitable for low-traffic roads

• VG-20: Suitable for medium-traffic roads

• VG-30: Suitable for high-traffic roads

• VG-40: Suitable for heavy-duty traffic areas like airports and container terminals

The compressive strength of cement mortar cube at 3 days is typically around 20-25 MPa.

• Compressive strength of cement mortar cube is an important parameter to assess its quality and durability

• The strength of cement mortar increases with age, so 3 days is an early testing point

• Typical compressive strength values for cement mortar cubes at 3 days range from 20-25 MPa

The physical properties of soil, GSB, and WMM materials can be tested through various methods.

• Particle size distribution test

• Moisture content test

• Specific gravity test

• Compaction test

• California Bearing Ratio (CBR) test

• Permeability test

• Shear strength test

The testing procedure for determining the physical properties of fresh and hardened concrete involves various tests.

• For fresh concrete, tests like slump test, air content test, and temperature test are conducted.

• For hardened concrete, tests like compressive strength test, flexural strength test, and water absorption test are conducted.

• Other tests may include density test, porosity test, and shrinkage test.

• These tests h...read more

CBR test is a laboratory test used to determine the strength of a soil sample.

• CBR stands for California Bearing Ratio.

• It is a penetration test that measures the load-bearing capacity of a soil sample.

• The test involves compacting the soil sample in a mold and subjecting it to a standard load.

• The ratio of the required force to penetrate the soil to the force required for a standard material is calculated.

• CBR values range...read more

GSB layer is a granular sub-base layer used in road construction to provide stability and support.

• GSB layer stands for Granular Sub-Base layer.

• It is typically made up of compacted aggregates like crushed stone or gravel.

• The purpose of the GSB layer is to provide a stable and solid foundation for the road pavement.

• It helps in distributing the load from the pavement to the underlying soil.

• The GSB layer also helps in prev...read more

Chemical test in steel is a process of analyzing the composition of steel to determine its chemical properties.

• Chemical tests are used to determine the amount of carbon, sulfur, phosphorus, and other elements in steel.

• These tests are important for ensuring that the steel meets the required specifications for its intended use.

• One common chemical test is the spectrometric analysis, which uses a spectrometer to measure th...read more