Top 50 interview Question for Fresher | civil Engineer interview question

2023-07-01 civilsitevisit

How to check slab thickness during pouring of slab?

Slab thickness can be checked during pouring by using various methods.

Use a laser level to check the thickness of the slab at various points.
Use a measuring tape to measure the thickness of the slab at various points.
Use a dipstick to measure the thickness of the slab at various points.
Ensure that the formwork is set up correctly to the required thickness.
Check the mix design and slump of the concrete to ensure the correct thickness is achieved.
Ensure that the concrete is poured evenly to achieve a consistent thickness.
Inspect the surface of the slab after pouring to ensure it is level and consistent.
Use a non-destructive testing method such as ultrasonic testing to check the thickness of the slab.

Why bent up bars are provided in beam?

Bent up bars are provided in beams to resist shear forces and prevent diagonal cracks.

Bent up bars increase the shear resistance of the beam.
They help to prevent diagonal cracks from forming in the beam.
They also help to distribute the load evenly across the beam.
The number and size of bent up bars depend on the design requirements and load capacity of the beam.
Bent up bars are typically placed at the ends of the beam and at points of high shear stress.

How many zone present in columns?

Columns can have multiple zones depending on the design and purpose.

The number of zones in a column depends on the design and purpose.
Zones can be created for different load-bearing capacities or aesthetic purposes.
For example, a column in a high-rise building may have multiple zones for different levels of wind resistance.
Another example is a decorative column that may have multiple zones for different patterns or textures.
The number of zones can vary from column to column and project to project.

What is the Least Count of Dumpy ?

The least count of a dumpy level, also known as the minimum graduation or reading, depends on the precision of the instrument and the scale used. In general, the least count of a dumpy level is typically between 5 mm. However, some models may have a higher or lower least count depending on the specific design and manufacturer.

Maximum temperature that is allowable for fresh concrete used according to the ASTM?

According to ASTM C1064/C1064M, the maximum allowable temperature for fresh concrete during delivery and placement is 90°F (32°C). If the temperature of the concrete exceeds this limit, it can cause rapid evaporation of the mixing water, which can lead to a reduction in the strength and durability of the concrete.

To prevent this, measures such as cooling the mixing water or using chilled aggregates may be necessary.

What is the process called for covering the concrete placed on the exposed top of an external wall?

The process of covering the concrete placed on the exposed top of an external wall is called coping. Coping is the process of covering the top surface of a wall, often with a sloping or curved profile, to prevent water penetration and protect the underlying masonry from weather damage.

Coping can be made from a variety of materials, including stone, brick, concrete, and metal, and can be designed in a variety of styles to match the architectural style of the building.

What is the minimum recommended weight of fine aggregate for sieve analysis as per ASTM C136?

According to ASTM C136, the minimum recommended weight of fine aggregate for sieve analysis is 300 grams. The sieve analysis is a test used to determine the particle size distribution of a sample of aggregate.

In the test, the sample is passed through a series of sieves with progressively smaller openings, and the amount of material retained on each sieve is weighed. The results of the test are used to determine the grading of the aggregate, which is an important factor in the design of concrete mixes.

How to check level of slab?

The level of slab can be checked using a spirit level or laser level.

Place the spirit level or laser level on the slab surface.
Check the bubble in the spirit level or laser beam to ensure it is level.
Repeat the process at different locations on the slab to ensure it is level throughout.
If the slab is not level, adjustments can be made by adding or removing material.
Ensure the slab is level before proceeding with further construction

What is Bursting Reinforcement?

Tensile stresses induced during prestressing operation are called as bursting reinforcement and it is maximum where the stress trajectories are concave towards the line of action of the load.

A badly mixed cement concrete results in

honey combing { Honeycombing is the term used to describe areas of the surface that are coarse and stony. It may be caused by insufficient fine material in the mix, perhaps due to incorrect aggregate grading or poor mixing. }

How we can measure the thickness of the Plaster ?

Bull mark is provided at a specific distance to make sure that the required thickness of the Plaster is uniform throughout.

How to check columns starter?

Columns starter can be checked by measuring the distance between the starter bars and the top of the column.

Measure the distance between the starter bars and the top of the column using a measuring tape.
Ensure that the distance is as per the design specifications.
Check for any damages or deformities in the starter bars.
Ensure that the starter bars are properly aligned and fixed in place.
Check for any cracks or damages in the column.
Ensure that the column is properly aligned and fixed in place

What is the percentage of water we can increase for every 25 mm slump?

As per IS 10262: 2009 Cl. 4.2, We can increase 3% for every additional 25 mm slump.

what is the cube size of RMC

The cube size of RMC (Ready Mix Concrete) is generally 150mm x 150mm x 150mm.

RMC is a concrete mixture that is manufactured in a batching plant or factory according to a set recipe and then delivered to a work site by truck mounted in-transit mixers.
The cube size of RMC is used to determine the compressive strength of the concrete after it has hardened.
The cube size of RMC is generally 150mm x 150mm x 150mm, but it can vary depending on the project specifications.
The cubes are casted and cured for 28 days before testing to determine the compressive strength of the concrete.

What is the standard thickness of Ceiling Plaster?

6 mm

where should we provide extra bars in beams

Top extra bars have to be provided near suppourts

Bottom extra bats have to be provided in the middle of beam.

Top extra bars have to be provided near suppourts

Bottom extra bats have to be provided in the middle of beam.

To increase tensile strength

Remove negative moment

How to check beam bottoms?

Beam bottoms can be checked by visual inspection and using a straight edge.

Inspect for any cracks or deformities on the bottom surface of the beam.
Use a straight edge to check for any unevenness or dips in the beam.
Check for any signs of corrosion or rust on the bottom surface of the beam.
Ensure that the beam is properly supported and not sagging.
Check for any signs of water damage or staining on the bottom surface of the beam.

What are the factors on which Development Length Depends?

Grade of Concrete, Grade of Steel

What is the purpose of Frog in Brick?

It helps in developing a proper joint between Brick and mortar.

Which steel is used in the manufacture of rails?

Manganese Steel

What type of cement is preferable in seawater construction?

Slag or Pozzolana (PSC or PPC) as per IS 456 : 2000 Cl. 8.2.8

What should be the pH of water used in concrete?

As per IS 456: 2000 Cl. 5.4.2, pH of water shall be not less than 6

What is the minimum lap length taken in the Compression zone?

As per IS 456: 2000 Cl. 26.2.5.1(d), the lap length in compression shall not be less than 24ᶲ, where ᶲ is the diameter of the bar

When bars of two different diameters are to be lapped, then lap length will be calculated on the basis of which dia?

As per IS 456: 2000 Cl. 26.2.5.1(e), the lap length shall be calculated on the basis of the diameter of the smaller bar.

When we will provide side face reinforcement in the beam?

As per IS 456: 2000 Cl. 26.5.1.3, When the depth of the web in a beam exceeds 750 mm, side face reinforcements shall be provided along with the two faces.

What is the minimum curing period for Mineral and Admixture added Cement?

The minimum curing period for Mineral and Admixture added Cement is 14 days

What is the meaning of Bored Cast in Situ?

Bored cast-in-situ pile is formed within the ground by excavating or boring a hole within it, with or without the aid of a temporary casing (to keep the hole stabilized) and subsequently filling it with plain or reinforced concrete. These piles are particularly applicable in certain subsoil conditions where penetration to a pre-determined depth is essential.

How many ranging rods are required to range a line?

At least three ranging rods are required for direct ranging and at least four for indirect ranging.

In plastering, what is known as 1st coat?

Undercoat.

What is Bentonite?

It is a Montmorillonite clay with a very high liquid limit.

How many strength developed after 7 days of concrete?

The strength developed after 7 days of concrete depends on various factors such as mix design, curing, and environmental conditions.

The strength of concrete after 7 days is typically around 60-70% of its ultimate strength.
Factors such as water-cement ratio, aggregate size and type, and curing methods can affect the strength development.
The strength can be tested using compression tests on concrete cubes or cylinders.
The strength development can also be influenced by the temperature and humidity conditions during curing.
It is important to follow proper mix design and curing procedures to ensure the desired strength is achieved.

what is the minimum and maximum slope

The minimum and maximum slope depend on the purpose of the site and the type of terrain.

The minimum slope for a site is typically 0.5% to ensure proper drainage.
The maximum slope depends on the type of terrain and the intended use of the site.
For example, a road can have a maximum slope of 10% while a pedestrian walkway can have a maximum slope of 5%.
In some cases, steep slopes may require retaining walls or other stabilization measures.
The slope should be designed to ensure safety and accessibility for all users of the site.