Site engineer interview question | Top 60 interview question

What is the minimum CBR of subgrade soil ?

As per IRC 58-2015 Clause , a minimum CBR of 8 % is recommended for 500 mm of selected soil used as subgrade.

SG top layer finishing work ?

SG top layer finishing work refers to the final layer of asphalt or concrete pavement on a road or highway.

  • SG top layer finishing work is the final layer of pavement on a road or highway
  • It is typically made of asphalt or concrete
  • The purpose of this layer is to provide a smooth and durable driving surface
  • It also helps to protect the underlying layers from damage and wear
  • Examples of SG top layer finishing work include chip seal, hot mix asphalt, and concrete pavement

What is code reference from which you are performing CBR test with 3 energy level as per MORTH 5 revision ?

AASHTO Designation: T 193-99 -2003

What is Wmm top layer finishing work ?

WMM top layer finishing work is the final layer of construction in a road pavement.

  • WMM stands for Wet Mix Macadam, which is a type of road construction material.
  • The top layer of WMM is usually made up of crushed aggregates and is laid to a thickness of 50-75mm.
  • The top layer is compacted using a vibratory roller to achieve the desired density and smoothness.
  • The finishing work involves trimming the edges of the road, removing any excess material, and ensuring that the surface is level and free of any irregularities.

What is the limit of Air Voids , flow & VFB in Dense Bituminous Macadam mix design ?

The limit of Air voids , flow & VFB is 3 -5% , 2- 4 mm & 65-75% simultaneously.

What is the density of soil in embankment layer ?

Somewhere it will difference near minimum (90% ) in Engineers india limited scope &  as per mort&h 95 % required.

What should be the minimum required density of Subgrade soil as per MORT&H 5th revision ?

17.5 KN/m³ or 1.78 gm /cc

What is mdd &fdd how to test it and what is the testing procedure ?

MDD and FDD are measures of soil compaction. Testing involves determining the maximum dry density and optimum moisture content.

  • MDD stands for Maximum Dry Density and FDD stands for Field Dry Density
  • Testing involves determining the maximum dry density and optimum moisture content of the soil sample
  • The testing procedure involves compacting the soil sample in a mold with a known volume and measuring its weight and moisture content
  • The test is repeated with varying levels of compaction and moisture content to determine the maximum dry density and optimum moisture content
  • The results of the test are used to determine the suitability of the soil for construction purposes

What is the softening point of VG 30 & VG40 grade bitumen ?

The softening point of VG30/VG 40 grade bitumen is 47 ºC / 50ºC

How much compaction required for Embankment and Subgrade ?

Compaction requirements for embankment and subgrade depend on soil type and project specifications.

  • Compaction requirements are determined by soil type and project specifications.
  • Embankment and subgrade compaction is typically measured by a Proctor test.
  • Compaction requirements can range from 90-95% of maximum dry density.
  • Compaction must be uniform and consistent throughout the project area.
  • Proper compaction ensures stability and longevity of the roadway.

What will be the maximum allowable size of granular material for subgrade soil as per MORT&H specification ?

Allowable size of granular material in subgrade is 50 mm

 How to mark levels ?

  • Marking levels involves determining the elevation of a point on the ground and then marking it on a surface or object.
  • This can be done using a variety of tools such as a level, a theodolite, or a laser level.
  • The marked levels are used to ensure that a surface or object is level or sloped correctly, such as in road construction or building foundations.

What is the maximum Liquid Limit & Plasticity Index allowed in earth work in embankment/subgrade soil ?

Clay should have Liquid Limit less than 50 % & PI should always be less than 25 %.

What is P&P and cross section ?

P&P stands for Policies and Procedures. Cross section is a view of the road or highway from the side.

  • Policies and Procedures (P&P) are the guidelines and rules that govern the design, construction, and maintenance of highways and roads.
  • Cross section is a view of the road or highway from the side, showing the different layers of materials used in construction, such as the pavement, subgrade, and drainage.
  • Cross section also shows the width and slope of the road, as well as the location of any curbs, gutters, and sidewalks.
  • Cross section is an important tool for highway engineers to ensure that the road is designed and constructed to meet safety and performance standards.

What is the frequency of taking core for BM/DBM/BC for checking of compaction & thickness of laid layer as per MORT&H 5th revision ?

One core at 700 m²

What is the maximum Aggregate Impact Value of aggregate allowed for Bituminous concrete(BC) work in flexible pavement ?

AIV should not be more than 24%.

What is the minimum cement content & maximum W/C ratio for M 25 RCC concrete for moderate condition as per MORT&H 5TH Revision ?

Minimum Cement Content 340 Kg & Maximum W/C ratio is 0.45

What is the density frequency of compacted layer in Embankment & subgrade/Shoulder ?

1 set of 10 test for 3000 m² of Embankment / 1 set of10 test for 2000 m² of Subgrade/Shoulder.

What is the FDD of Subgrade, GSB, WMM ?

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

What is the maximum Aggregate Impact Value of aggregate for concrete work ?


What is the rate of spray of Prime Coat over WMM ?

0.7 -1.0 kg/m²

Which IS code specified the specification of aggregates ?

IS 383-2016

How much Kinetic Viscosity of VG 40 bitumen is ?

The Kinematic Viscosity of VG 40 grade bitumen is 400 cst minimum at 135 º C.

what is the minimum speed of roller ?

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.

What is the minimum cement content & maximum W/C ratio for Pile concrete as per IRC 78 -2014 Cl 709.1.9 ?

 Minimum amount of cement  content 400 kg/m³ & maximum W/C ratio is 0.40

What will be the minimum cement content as per IRC SP 49 2014 for DLC mix design ?

140 kg / m³

How many samples you take for 900 m² of DLC laying ?

3 samples (9 Cubes)

What is the Nominal size of aggregate for grade 1 Bituminous Concrete?

Ans : 19 mm

what is the tolerance OF PQC and DLC ?

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.
  • It is important to ensure that the specified tolerance is met during construction to ensure the longevity and durability of the pavement.

what is the minimum thickness of DBM ?

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

How many types of grade in GSB ?

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.

What is the maximum limit of FI+EI for Dense Bituminous Macadam as per MORT& H 5th revision ?

Maximum FI+EI limit is 35%

What is setting time RS1 & SS1 Emulsion?

15 to 30 minutes for RS1  & 24 hours for SS1  

How many cube mould required for 110 m³ concrete ?

4 +1+1=6 samples means 18 cubes as IS 456-2000

How to remove bumping in sg at hard rock areas.?

To remove bumping in sg at hard rock areas, proper rock excavation techniques and road design considerations are necessary.

  • Perform thorough rock excavation to remove any irregularities or protrusions in the hard rock areas.
  • Ensure proper compaction of the subgrade and base layers to minimize settlement and unevenness.
  • Design the road profile with appropriate cross slopes and superelevation to facilitate smooth vehicle movement.
  • Consider using specialized techniques like rock blasting or rock smoothing to create a more even surface.
  • Regular maintenance and monitoring of the road surface to address any potential issues promptly.

Which grade gsb used in previous projects ?

The grade of GSB used in previous projects varies depending on the specific project requirements.

The grade of GSB (Granular Sub-Base) used in previous projects is determined based on factors such as traffic load, soil conditions, and project specifications.

Different grades of GSB, such as GSB-20, GSB-25, GSB-30, etc., may be used in different projects.

For example, in a high-traffic highway project, a higher grade of GSB like GSB-30 may be used to ensure better stability and durability.

On the other hand, in a low-traffic road project, a lower grade like GSB-20 may be sufficient.

The selection of the grade of GSB is typically done by conducting laboratory tests on the available soil and considering the design requirements of the project

As per MORT&H 5th revision how many grades of GSB are there?

Six grades are there.

From which IS code  concrete mix design is being done ?

IS 10262 -2009 now the latest revision introduced IS 10262-2019

On what temperature  Kinetic Viscosity test of any bitumen is being done ?

At 135 º C

What is minimum bitumen content as per MORT&H 5th revision in DBM & BC for grade 1 mix ?

DBM 4.0 % & BC 5.2 % Minimum for the aggregate having specific gravity below 2.7.

how do you design horizontal and vertical alignment ?

Horizontal and vertical alignment is designed based on factors like terrain, speed limit, and safety requirements.

  • Terrain analysis is done to determine the best alignment
  • Speed limit and design speed are considered for horizontal alignment
  • Sight distance and stopping distance are considered for vertical alignment
  • Safety requirements like minimum radius of curvature and superelevation are also taken into account
  • Computer-aided design software is used for accurate alignment design

How to calculate quantity of PQC ?

Quantity of PQC can be calculated by multiplying area with thickness

  • PQC stands for Pavement Quality Concrete
  • Area is calculated by measuring length and width of the pavement
  • Thickness is usually 150 mm for highways
  • Quantity = Area x Thickness

How to calculate quantity of DBM ?

Quantity of DBM can be calculated by using the formula: Volume of DBM = Area x Thickness

  • Calculate the area of the road surface to be covered with DBM
  • Determine the required thickness of the DBM layer
  • Multiply the area by the thickness to get the volume of DBM required
  • Consider the wastage factor while calculating the quantity of DBM
  • Use appropriate units of measurement for accuracy

What is Compaction parameter of Bituminous Concrete ?

Relative density minimum 92% of Gmm of that day

How much water can reduce the Superplasticizer ?

 Practically more than 30 %

What is the relation between Air Voids & Density ? Air voids is inversely proportional to Density i.e If Air Voids are increasing density will be decreasing & reverse versa

In tack coat which type of emulsion is used?


What is the minimum rolling & laying temperature for VG grade 30 DBM/BC mix ?

Minimum laying temperature for laying is 140 º C & minimum rolling temperature is 90 º C

What is the super pave parameter for binders?

The superpave parameter for binders is the Performance Grade (PG) of the binder.

  • Superpave is a mix design system for asphalt pavements.
  • Performance Grade (PG) is a binder classification system based on temperature susceptibility.
  • PG is determined by the high and low temperature properties of the binder.
  • For example, PG 64-22 means the binder is suitable for use in areas with maximum pavement temperature of 64°C and minimum pavement temperature of -22°C.

In prime coat what type emulsion is used as per MORT&H 5th revision in Indian condition ?


What is the minimum sand equivalent value of crusher dust if to be used in Bituminous work ?

50 %

What does mean by VG 40 Bitumen ?

. Kinematic viscosity at 135º C, is 400 cSt, min.

What is the minimum rolling & laying temperature for VG grade 30 DBM/BC mix ?

Minimum laying temperature for laying is 140 º C & minimum rolling temperature is 90ºC.

In prime coat what type emulsion is used as per MORT&H 5th revision in India ?

How much camber is provided in Bc road?

The amount of camber provided in BC road varies depending on the road classification and location.

  • Camber is the slope provided on the road surface to ensure proper drainage and prevent water accumulation.
  • The amount of camber provided is determined by the road classification, traffic volume, and location.
  • For example, a rural road may have a camber of 2-3% while an urban road may have a camber of 1-2%.
  • The Ministry of Transportation and Infrastructure provides guidelines for camber design in BC roads.
  • The camber design also takes into account factors such as pavement type, climate, and terrain.

Which type of cement we use in pqc ?

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 and the Yamuna Expressway.

Why we use admixture ?

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

What is the minimum sand equivalent value of crusher dust if to be used in Bituminous work ?

50 %

What does mean by VG 40 Bitumen ?

 Kinematic viscosity at 135 º C, is 400 cSt, min

Can you tell the name of IRC SP guide line for Quality System for road construction highway & Road bridge  ?

IRC SP 57 – 2000 but now latest revision with change the name also is IRC SP 112 -2017 & IRC SP 47-1998 for Road Bridge

 Which apparatus is used for softening point ?

Ring & ball apparatus

What is the Rate of spread of Prime coat/Tack Coat ?

 Three test per day

Why you want to leave your present company?

1.I’d really love to be part of your project from beginning to end, and I know I’d have that opportunity here.

2. In my current role, I’ve learned many new skills. I’m looking for a position in which I can continue to grow that skill set in new circumstances.”.

3. I’ve learned a lot in my current role, but I’m looking for an opportunity that provides more challenges as I continue developing my skills and abilities.”

Tell me your 5 strong point?

Flexibility to handle any situation

2. Good Communication

3.Work under pressure



Tell me your achievement in your carrier?

1.Re-organized something to make it work better

2.Identified a problem and solved it

3.Developed or implemented new procedures or systems

4.5.Worked on special projects

Received awards/Certificate

What is your salary expectation?

This is your most important negotiation. Never lie about what you currently make, but feel free to include the estimated cost of all your fringes, which could well tack on 25 -30% more to your present “cash-only” salary.

How much time you required to join ?

Always says one month but handle this situation very calmly. if you are ideal & have no job , can say within 7 days.

what is super elevation? what are max limit of super elevation?

Superelevation refers to the banking of a roadway to counteract the lateral forces experienced by vehicles as they travel around a horizontal curve. In other words, it’s the tilt or slope of a road surface to the outside of a curve, which helps vehicles maintain their stability and prevent them from slipping or skidding off the road.

The maximum limit of super elevation is determined by several factors, including the design speed of the roadway, the radius of the curve, and the lateral friction between the tires of vehicles and the road surface. As a general rule, the maximum super elevation for highways is typically limited to 8%. However, some roads may have a higher or lower limit based on specific design requirements. Additionally, the maximum super elevation for low-speed rural roads may be lower compared to high-speed highways, as vehicles travel at lower speeds on rural roads and have a lower risk of losing control.

What is difference between bitumen road & RCC road ?

Bitumen roads are flexible and made of bitumen while RCC roads are rigid and made of reinforced concrete.

  • Bitumen roads are cheaper to construct than RCC roads.
  • RCC roads have a longer lifespan than bitumen roads.
  • Bitumen roads are more suitable for low traffic areas while RCC roads are better for high traffic areas.
  • RCC roads require more maintenance than bitumen roads.
  • RCC roads are more durable and can withstand heavy loads better than bitumen roads.

How much quantity 1 roller can compact in one day?

Usually 700 to 800 m3

How to maintain a slope in hill cutting location.

As per site land availablity it will maintain slope between 60° to 70°