10+ Highway Engineer Interview Questions and Answers for Freshers

PQC is a type of pavement quality concrete laid on site using specialized vehicles and instruments. DLC, GSB, CTSB, and CTB are different layers used in road construction.

• PQC (Pavement Quality Concrete) is a type of concrete used for road pavement.

• PQC is laid on site using pavers or slipform machines.

• Specialized vehicles like concrete mixers and finishers are used for laying PQC.

• Instruments like laser screeds and rollers are used for leveling and compacting PQC.

• DLC (Dry Lean ...read more

FDD of Subgrade, GSB, WMM in highway engineering

• FDD stands for Flexible Pavement Design

• Subgrade FDD depends on soil type, moisture content, and other factors

• GSB FDD depends on traffic volume, subgrade strength, and other factors

• WMM FDD depends on traffic volume, subgrade strength, and other factors

• FDD helps in determining the thickness of the layers in flexible pavement design

Yes, I have knowledge of Bbs, bentup, and operating auto level.

• Bbs stands for Bar Bending Schedule, which is a list of reinforcement bars with their lengths and shapes required in a construction project.

• Bentup refers to the process of bending reinforcement bars to the required shape and size before placing them in concrete structures.

• Providing reinforcement in concrete structures enhances their strength and durability.

• Operating an auto level involves setting up the instrument...read more

CTSB and GSB are different types of aggregates used in highway engineering.

• CTSB stands for Crushed to Specified Breakdown and GSB stands for Granular Sub Base.

• CTSB is a type of aggregate where the particles are crushed to a specified size and shape, while GSB is a layer of granular material used as a base for pavement construction.

• CTSB is typically used in the construction of flexible pavements, while GSB is used as a sub-base layer to provide a stable foundation for the pave...read more

Hard shoulders are provided on highways for emergency stopping, breakdowns, and to improve safety.

• Hard shoulders provide a safe area for vehicles to stop in case of emergencies or breakdowns

• They help reduce the risk of accidents by providing a designated stopping area

• Emergency vehicles can use hard shoulders to reach incidents quickly and safely

• Hard shoulders also allow for easier maintenance and construction work on the highway

Membranes are used in highway engineering for various purposes such as waterproofing, erosion control, and filtration.

• Membranes are used for waterproofing to prevent water from seeping into the pavement layers.

• They are also used for erosion control to protect slopes and embankments from erosion caused by water runoff.

• Membranes can be used for filtration to separate different layers of soil or aggregate materials in road construction.

• Examples of membranes used in highway engin...read more

We use Portland Pozzolana Cement (PPC) in PQC.

• PPC is a type of cement that is commonly used in PQC.

• It is a blend of Portland cement and pozzolanic materials like fly ash, volcanic ash, etc.

• PPC is preferred over Ordinary Portland Cement (OPC) due to its higher durability, strength, and resistance to chemical attacks.

• It also has a lower heat of hydration, which reduces the risk of thermal cracking.

• Examples of PQC projects where PPC was used include the Mumbai-Pune Expressway an...read more

The minimum speed of roller depends on the type of roller and the type of material being compacted.

• The minimum speed of roller is typically specified by the manufacturer.

• The type of material being compacted can also affect the minimum speed of roller.

• For example, a vibratory roller may have a minimum speed of 2 mph for compacting asphalt, while a static roller may have a minimum speed of 1 mph for compacting soil.

The minimum thickness of DBM varies depending on the intended use and traffic volume.

• DBM thickness ranges from 40mm to 100mm depending on traffic volume

• Minimum thickness for low traffic volume is 40mm

• Minimum thickness for high traffic volume is 80mm

• Thickness may also depend on the underlying layers and subgrade

The tolerance of PQC and DLC depends on various factors such as the type of pavement, traffic volume, and climate.

• The tolerance for PQC and DLC varies depending on the type of pavement used.

• Traffic volume and climate also play a significant role in determining the tolerance of PQC and DLC.

• For example, high traffic volume and extreme weather conditions may require a lower tolerance for PQC and DLC.

• The tolerance for PQC and DLC is usually specified in the project specifications...read more

There are several types of rollers used in highway engineering for compaction purposes.

• Vibratory rollers

• Smooth wheeled rollers

• Pneumatic tired rollers

• Sheepsfoot rollers

• Grid rollers

There are two types of grade in GSB - Type A and Type B.

• Type A grade is used for heavy traffic areas and has a higher percentage of larger size aggregates.

• Type B grade is used for low traffic areas and has a lower percentage of larger size aggregates.

• The choice of grade depends on the traffic volume and the type of pavement.

• GSB stands for Granular Sub Base, which is a layer of material placed on the subgrade before the pavement layers are added.

Dense Bituminous Macadam is a type of road construction material made up of well-graded aggregates and bitumen binder.

• Consists of well-graded aggregates like crushed stone, gravel, or sand

• Bound together by bitumen binder

• Provides a strong and durable road surface

• Used in highways, airport runways, and heavy traffic areas

Core cutting is a process of extracting cylindrical samples from a structure or material for testing purposes.

• Core cutting is commonly used in construction and civil engineering to assess the quality of materials used in structures.

• The extracted core samples are typically analyzed for strength, density, composition, and other properties.

• Examples of core cutting applications include testing concrete strength in buildings, assessing asphalt quality in roads, and evaluating soil...read more

Admixtures are used to modify the properties of concrete, such as setting time, workability, and strength.

• To improve workability of concrete

• To reduce water content in concrete

• To accelerate or retard setting time of concrete

• To improve strength and durability of concrete

• To reduce corrosion of reinforcement in concrete

• Examples: water reducers, air-entraining agents, accelerators, retarders, superplasticizers