Civil engineer interview questions in 2022

civil engineer interview questions are too much because Civil engineering is a broad course. and during college time every student studies hard but difficult to keep remembering all the topics in civil engineering. so when any students are preparing for their job interview they are confused that which topic they should prepare properly so they can crack the interview and get the job. so here we are going to discuss some civil engineer interview questions which are frequently asked in civil engineer interviews.

 

Civil engineer interview questions about slab

 

commonly in any civil engineer interview questions, they used to ask the question related to the slab because the slab is an important element of any building construction

Difference between a one-way slab and a two-way slab?

characteristics  one- way slab  two – way slab 
Definition  As per IS 456 2000, in the case of the one-way slab, the ratio of the longer span to the shorter span is greater than or equal to 2 in the case of the two-way slab, the ratio of the longer span to the shorter span is less than 2
support A one-way slab is supported by the beam on the two opposite sides A two-way slab is supported by the beam on all the four sides
Direction this type of slab bends only in one direction, i.e, the direction along its shorter span and the two-way slab bends in both direction
 Deflection  A one-way slab deflects in a cylindrical shape while the two-way slab deflects in such a manner shape like a saucer
Loads  in the one-way slab, loads are carried in one direction only. whereas in two-way slab loads are carried in both the direction
Main bars  in the case of the one-way slab, since the slab bends in one direction .hence to counter this bending, main steel bars are provided along a shorter span slab bends in both directions hence main bars are provided along both the spans

 

civil engineer interview questions about bars 

 

Bars play an important role in any type of construction, so this topic also interesting for the civil engineer interview questions

 

What are the crank bars? why do we provide crank bars?

 

Cranked bars are defined as those bars which can resist negative bending moment or the hogging moment. it is provided because a beam carries a load on its span. due to this loading on the span of the beam, it will be subjected to the bending moment and it will be deflected in such a shape as a curve.

 

the beam tends to bend in a way that the maximum bending moment will be at the center of the span, there will be a positive bending moment at the center of the beam and a negative moment or simply hogging moment at both the supports, so to counter the positive moment we provide reinforcement bars at the bottom of the beam to resist the tensile stress and to counter the negative moment we also have to reinforce the top of the support.

 

now we don’t need to place these bars separately and so we place crank bars there which are bent-up bars that resist the hogging at support.

 

civil engineer interview questions

 

Advantages of crank bars are
  • To resist the hogging moment
  • To resist the shear force
  • To reduce the reinforcement

 

What is development length? purpose of providing development length in RCC members.

 

To understand the development length let’s consider the steel bars embedded in a column with the length L1 and now let’s apply some force F (pulling ) on another side of the bar, due to the applied force F on another side of the steel bar the bar come out from the column. This indicates that there is not enough bond strength between the column and steel bar against the applied force to hold the bar inside the column. That means L1 is not a safe length to maintain the bond strength between the column and steel bar.

 

Now suppose let’s increase the length of bar L2 and again applied the force F(pulling ) and the bars come out from the column, that means L2 is also not a safe length to maintain the bond strength between the column and bar.

 

Now again let’s increase the length of the bar inside the column Ld and let’s assume that the bar does not come out on the application of this force this time whindicatescate Ld is the safe length to maintain the bond strength between the column and the bar.

 

This minimum length (Ld)

this minimum length of steel bar to be provided inside the column to establish desired bond strength between concrete and steel is known as development length. and development length of steel bar which holds two concrete members together. i.e , beam , column ,footing etc.

 

It is the minimum length of steel bar to be inserted inside the concrete column to ensure sufficient adhesion between concrete and steel. and the reason why we provide development length is that

 

civil engineer interview questions

  • it reduces the chances of a beam coming out of the concrete.
  • it is provided to safely transmit forces or stress from beam to column.
  • it ensures the safe bond between the bar surface and concrete and ensures that the bar doesn’t slip out of the concrete.

 

civil engineer interview questions about material quantity

 

for calculating the total estimation of any construction  we should know properly how many materials are required for any structural member, that’s why this points also important for the civil engineer interview questions

 

How to calculate the quantity of cement, sand, and aggregate in the slab?

 

It is an easy task to calculate how many materials are required for the construction of a slab or the quantity of sand, cement, and aggregate required in slab construction.

 

Let’s illustrate it with an example:-

Suppose we have to construct a slab length of 30ft each and a thickness of slab 0.5ft.

 

For plan cement concrete works, the grade of concrete used is M15. i.e, characteristic compressive strength of 15N/mm square. The ratio of cement: sand: the aggregate of M15 is 1: 2: 4. That is one part of cement is mimixedith two parts of sand and four parts aggregates.

 

To calculate the materials used in the slab we need to calculate first the total volume of the slab (V), which is given, V= L*B*H = 30*30*0.5= 450cft. it should be noted that this total volume is the wet volume of the slab.

 

Now we need to convert this wet volume into dry volume and we know that Dry volume = wet volume *1.54, while this 1.54 is a constant value. so dry volume =1.54*450=693cft .

 

Calculate the volume of cement, Vc = ration of cement / total ratio* dry volume of the slab. While the ratio of cement is 1, the total ratio is 7 and the dry volume is 693cft, so after putting these values in the above formula, the volume of cement =1/7*639=99cft, the number of cement bags = volume of cement/volume of 1 bag, while the 1 bag of cement volume is 1.25 ft

 

So number of required bag = 99/1.25 = 79.2 – 80 bags .

Now the volume of sand is calculated by using the formula that is

The volume of sand = ratio of sand/ total ratio*dry volume of the slab

So here sand ratio = 2 , according to this value = 2/7*639 = 198cft

The volume of aggregate = ratio of aggregate/total ratio * dry volume

So after putting the all value in the formula we can get = 4/7*639=393cft

 

civil engineer interview questions

 

Summary

So in the above discussion, we learned important points about the slab, the quantity of material, cranked bars, etc . these all the points are so much helpful for any civil engineering students as well as working engineers after you prepare all these civil engineer interview questions you can easily get the job.

Sharing Is Caring:

A dedicated civil engineer with more than 5 years of practical experience in construction as a site engineer founded our company. I am passionate about all things civil engineering and construction. My mission is to make the complex field of civil engineering accessible to everyone.

Leave a Comment