Afcons Infrastructure Civil Engineer-Highway/Roadway Interview Questions and Answers

Blanket layer is a layer of soil placed on top of the subgrade to improve its strength and stability.

• Blanket layer is used in the formation of railway embankments to provide a stable base for the tracks.

• It is typically made up of compacted soil or other materials such as crushed rock or gravel.

• The thickness of the blanket layer can vary depending on the soil conditions and the weight of the trains that will be using th...read more

Gap graded soil is a type of soil that has a wide range of particle sizes with little or no intermediate-sized particles.

• Gap graded soil has poor compaction characteristics and low permeability.

• It is commonly found in areas with high erosion rates such as river banks and hillsides.

• Examples of gap graded soil include gravelly soils and sandy soils with large void spaces.

• It requires special attention during construction ...read more

Stress strain diagram of mild steel shows the relationship between stress and strain during the deformation process.

• The diagram has two parts: elastic and plastic.

• In the elastic region, stress is proportional to strain.

• In the plastic region, stress increases with strain but without any increase in strain.

• The yield point is the point where plastic deformation begins.

• The ultimate strength is the maximum stress that the m...read more

Aggregate impact testing is a method to determine the toughness of aggregates used in road construction.

• It involves dropping a metal hammer on a sample of aggregate and measuring the amount of fragmentation.

• The apparatus used in this testing includes an impact testing machine, a cylindrical measure, a tamping rod, and a balance.

• The impact testing machine consists of a metal base, a vertical guide, and a hammer of weigh...read more