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Top 18 Interview question for freshers |civil engineer interview

What is the size of tread and raise and angle of stairs ?

Riser =150 to 200mm

Tread 250 mm to 300 mm

Angle of stairs is 25° to 40°

What is the standard size of ply board used for shuttering work ?

The standard size of ply board used for shuttering work varies depending on the project requirements.

  • The most commonly used size for ply board in shuttering work is 4 feet by 8 feet.
  • However, other sizes such as 3 feet by 6 feet or 2 feet by 4 feet may also be used depending on the project specifications.
  • The thickness of the ply board can range from 12mm to 18mm, again depending on the requirements of the project.
  • Ply boards are used in construction for creating temporary structures like formwork or molds for concrete pouring.
  • They provide support and shape to the concrete until it sets and gains strength.
  • The size of the ply board used for shuttering work is determined by factors such as the size and shape of the structure being constructed, the load it needs to bear, and the duration of the shuttering work.

Which IS code use for flexible and rigid pavement ?

IS code 1641 for flexible pavement and IS code 456 for rigid pavement.

  • IS code 1641 is for the design and construction of flexible pavement using bitumen, tar, or asphalt.
  • IS code 456 is for the design and construction of rigid pavement using concrete or reinforced concrete.
  • Both codes provide guidelines for materials, design, construction, and maintenance of pavements.
  • These codes are important for ensuring the durability, safety, and performance of pavements.
  • Civil site engineers must be familiar with these codes and use them in their work.

What is the temperature for DBM mixing?

The aggregates must be heated to between 150°C and 170°C so they can be mixed. The temperature difference between the binder and the gravel should not exceed 14°C. Mixing should be done properly to get a uniform blend. The maximum discharge temperature of the DBM mix should be 165°C

What is the laying temperature of bitumen?

Binder gradeMinimum temperature (°C) at completion of rolling

Reconciliation of murrum,GSB, WMM, DBM and BC

Reconciliation is the process of verifying the quantity and quality of materials used in construction.

  • Reconciliation ensures that the actual quantity of materials used matches the quantity specified in the design.
  • It also ensures that the quality of materials used meets the required standards.
  • Murrum, GSB, WMM, DBM, and BC are different types of materials used in road construction.
  • Reconciliation of these materials involves comparing the quantity of each material used with the quantity specified in the design.
  • It also involves testing the quality of each material used to ensure it meets the required standards.

Which tests to be used for identify compaction of soil?

Tests to identify soil compaction

  • Proctor compaction test
  • Sand cone test
  • Core cutter test
  • Nuclear density test
  • Plate load test

Which type of material used to stop the collapse of soil?

Geotextiles and geogrids are commonly used materials to stop the collapse of soil.

  • Geotextiles are permeable fabrics made of synthetic fibers that are used to stabilize soil and prevent erosion.
  • Geogrids are high-strength polymer grids that are used to reinforce soil and provide stability.
  • Other materials such as gabions, retaining walls, and soil nails can also be used to prevent soil collapse.
  • The choice of material depends on the type of soil, the slope angle, and the amount of pressure the soil is under.

Why manhole cover are round in shape ?

Manhole covers are round in shape to prevent them from falling into the hole.

  • Round covers cannot fall into the hole as they cannot fit through diagonally.
  • Round covers can be easily rolled to move them from one place to another.
  • Round covers are easier to manufacture and install compared to other shapes.
  • Round covers are more aesthetically pleasing compared to other shapes.
  • Other shapes such as square or rectangular covers can be rotated and fall into the hole.
  • Round covers are safer for pedestrians and vehicles as they do not have sharp edges.

What is the lapping location for top and bottom bar of a beam?

The lapping location for top and bottom bars of a beam is typically at the mid-span of the beam.

  • The lapping location is where two reinforcement bars are overlapped and connected to ensure continuity and strength in the beam.
  • For top bars, the lapping location is usually at the mid-span of the beam, where the bending moment is maximum.
  • For bottom bars, the lapping location is also at the mid-span of the beam, but it can vary depending on the design and structural requirements.
  • The lapping length should be sufficient to develop the required bond strength between the bars and avoid any potential failure.
  • Proper lapping of reinforcement bars is crucial to ensure the structural integrity and load-carrying capacity of the beam.

What is the internal plastering thickness and mix ratio ?

The internal plastering thickness and mix ratio vary depending on the type of surface and desired finish.

  • The thickness of internal plastering typically ranges from 12mm to 20mm.
  • The mix ratio for internal plastering is usually 1:4 (cement:sand) or 1:6 (cement:sand) depending on the strength requirement.
  • For smooth finishes, a finer mix ratio of 1:3 (cement: sand) may be used.
  • Gypsum plaster is commonly used for internal plastering due to its ease of application and quick drying time.

Why chicken mesh is provided for electrical pipe packing ?

Chicken mesh is provided for electrical pipe packing to prevent the entry of rodents and other small animals.

  • Chicken mesh acts as a physical barrier to prevent rodents and small animals from entering the electrical pipe.
  • Rodents can chew through electrical wires, causing damage and potential safety hazards.
  • Chicken mesh is made of strong and durable material, making it difficult for rodents to penetrate.
  • It is cost-effective and easy to install, providing an effective solution for protecting electrical pipes.
  • Examples of other small animals that can be prevented by chicken mesh include snakes, insects, and birds.

What is the crank length for slab bar?

The crank length for slab bar is the distance between the center of the slab bar and the center of the crank.

  • The crank length is determined based on the design requirements and specifications of the slab.
  • It is usually measured in millimeters or inches.
  • The crank length helps in providing the required reinforcement and structural stability to the slab.
  • The length of the crank can vary depending on factors such as the span of the slab, load requirements, and design considerations.
  • For example, in a reinforced concrete slab with a span of 6 meters, the crank length may be around 300 mm.

What are quality point at the pouring time of concrete.?

Quality points at the pouring time of concrete include proper mix proportions, correct placement, adequate compaction, and appropriate curing.

  • Proper mix proportions ensure the desired strength and durability of the concrete.
  • Correct placement involves placing the concrete in the designated location without segregation or excessive bleeding.
  • Adequate compaction ensures that there are no voids or air pockets in the concrete, resulting in a dense and strong structure.
  • Appropriate curing involves maintaining the moisture and temperature conditions to promote hydration and strength development.
  • Other quality points may include using quality materials, following industry standards, and conducting regular inspections and tests.

where should we provide extra bars in beams ?

Extra bars in beams should be provided at locations of high bending moments or where additional reinforcement is required.

  • Extra bars should be provided at supports and near the mid-span of the beam where bending moments are highest.
  • Additional reinforcement may be required at locations where concentrated loads or point loads are applied.
  • Extra bars should also be provided at locations where there are openings or cutouts in the beam.
  • In seismic zones, extra bars should be provided to enhance the beam’s resistance to lateral forces.
  • The need for extra bars can be determined through structural analysis and design calculations.

What is the purpose of extra bars in beams ?

Extra bars in beams are used to increase the strength and load-bearing capacity of the structure.

  • Extra bars, also known as reinforcement bars or rebar, are added to beams to enhance their structural integrity.
  • These bars are typically made of steel and are placed within the concrete to provide additional strength.
  • The purpose of extra bars is to resist tensile forces and prevent cracking or failure of the beam under heavy loads.
  • They help distribute the load evenly across the beam and improve its overall load-bearing capacity.
  • The number and arrangement of extra bars depend on the design requirements and the expected loads on the beam.
  • For example, in a heavily loaded beam, additional bars may be placed at the bottom to increase its flexural strength.
  • Extra bars can also be used to reinforce specific areas of the beam where stress concentration is expected.
  • In earthquake-prone areas, extra bars may be added to beams to improve their resistance against seismic forces.
  • Overall, the purpose of extra bars in beams is to ensure the structural stability and safety of the construction.

what is the minimum and maximum slope

A simply supported beam is a structural element that is supported at both ends and is free to rotate and deflect under load.

  • A simply supported beam is one of the most common types of structural elements used in construction.
  • It consists of a beam that is supported at two points, typically with pins or rollers.
  • The beam is free to rotate and deflect under load, allowing it to distribute the applied forces.
  • Simply supported beams are commonly used in bridges, buildings, and other structures.
  • They are relatively easy to design and analyze compared to other types of beams.
  • Examples of simply supported beams include a wooden plank resting on two supports, or a steel beam supported by columns.