25 civil engineering interview questions and answers - freshers, experienced.pdf

8/23/2014

25 ci vil eng ineer i ng inter vi ew q uesti ons and answer s - fr esher s, exper ienced

Part 1 Part 2 Part 3 Part 4 Part 5 Part 6 1.What 1.What are the the s teps in volved in the concreting process , explain? explain? 2. Describe briefly the various various methods of concrete concrete curing. 3. What do you you understand by “preset” during the installation proces s of bridge bea rings? 4. Why are steel plates inserted inside bearings in elastomeric bearings? 5. What reinforcements are used in the process o f prestress prestress ing?

What are the steps involved in the concreting process, explain? The major steps involved involved in the process of concreting concreting are as follows : 1. Batching 2. Mixing 3. Transporting and pl acing of concrete 4. Compacting. > Batching: Batching: The The process of meas urement of the different different materials for the the making of concrete is known as batching. batching batching is usual ly done in two ways: volume volume batching and weight batching. In case of volume volume batching the meas urement is done in the form of volume whereas i n the case of weight batching it is done by the the weight. > Mixing: Mixing: In In order to create good concrete the mixing of the m aterials shoul d be first done i n dry condition and a fter fter it wet condition. The two general methods of mixing are: hand mi xing and m achine mi xing. > Transportation Transportation and placing of concrete: Once Once the concrete mixture mixture is created created it m ust be transported to its final lo cation. The The concrete is placed on form works and should always be dropped on its final location as closely as possible. > Compaction of concrete: When When concrete is placed it can ha ve air bubb les entrapped in it which can lead to the reduction of the s trength trength by 30%. In order to to reduce the air bubbles the process of compaction is performed. performed. Com paction is g enerally performed performed in two ways: ways: by hand or by the use of vibrators.

Describe briefly the various methods of concrete curing. Curing is the proces s of mai ntaining the mois ture and temperature temperature conditions for freshl freshl y deployed concrete. concrete. This This is d one for smal l duration of time to allow the hardening of concrete. The The m ethods that are involved involved in saving the s hrinkage of the concrete includes: (a) Spraying Spraying of water: on walls , and colum ns can be cured by sp rinkling water. (b) Wet cov covering ering of s urface: can be cured by usi ng the s urface with wet gunny bags or straw (c) Ponding: the the horizontal horizontal s urfaces including the slab a nd floors can be cured by stagnating the water. (d) Steam Steam curing: of pre-fabricated pre-fabricated concrete concrete units s team can be cured by pass ing it over the the units that are are under clos ed chambers . It allows faster curing process and res ults i n faster recovery recovery.. (e) Application Application of curing compounds : compounds having calcium chloride can be applied on curing surface. This This keeps the s urface wet for  a very long time.

What do you understand by “ preset” during the installation installation process of bridge bearings? During the installation of bridge bearings the s ize of the upper plates is reduced to save the the material cos ts. This process is known as preset. Generally Generally the the upper bearing plate compris es of the following components : > Length Length of bearing > 2 x ir reversible reversible movement. > 2 x rev re versibl e m ovement. ovement. The bearing bearing initially is placed right in the middl e point point of the upper bearing plate. No directional effects of irreversible irreversible movement is consider  cons ider ed. But But since  since the i the irreve rrever  r sible s ible movement us ually takes takes place in one direction only the the dis placed direction is placed away from from the midpo int. In In su ch cases the length of the upper plate is equal to the length of the the length of the bearing + irreversible irreversible movement + 2 x reversible reversible movement.

Why are steel plates inserted inside bearings in elastomeric bearings? In order to to make a elas tomeric bearing act/ function function as a soft spring it s hould be m ade to allow it to bulge laterally and als o the stiffness compres sio n can be increased by sim ply increasi increasi ng the limiting am ount of the the lateral bulging. In many cases cases in order to increase the compres sio n stiffness of the bearing the the usage of metal plates is made. Once steel plates are included in the bearings the freedom freedom of the bulge is restricted dramatically, dramatically, also the deflection of the the bearing is reduced as com pared to a bearing without the the presence of steel pla tes. The tensi tensi le stress es of the bearings are indu ced into the steel plates. But the the presence of the metal plates does not affect affect the the she ar  stiffness of the bearings.

What reinforcements are used in the process of prestressing? The major types types of reinforcements used in pres tressin g are: > Spalling Reinforcement: The spalling s tresses leads to s tress behin d the loaded area of the anchor blocks. This results in the breaking off of the surface concrete. concrete. The most likely causes of such types types of stress es are Poiss on`s effects strain interoperability or by the the s tress trajectory trajectory shapes . http://car eer r i de.com/ci vil - eng i neer i ng - i nter vi ew- q uesti ons.aspx

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25 civil engineering interview questions and answers - freshers, experienced

> Equilibrium reinforcements: This type of reinforcements are required where s everal anchorages exist where the prestressi ng loads are applied in a s equential manner. > Bursting Reinforcements: These kin ds of s tresses occur in cases where the stress trajectories are concave towards the line of action of  load. In order to reduce such stress es reinforcements in the form of bursting is required. Part 1 Part 2 Part 3 Part 4 Part 5 Part 6

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25 civil engineering interview questions and answers - freshers, experienced

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