Civil Engineering Interview Questions and Answers
Question - 1 : - What Are The Steps Involved In The Concreting Process, Explain?
Answer - 1 : -
Batching: The process of measurement of the different materials for the making of concrete is known as batching. batching is usually done in two ways: volume batching and weight batching. In case of volume batching the measurement is done in the form of volume whereas in the case of weight batching it is done by the weight.
Mixing: In order to create good concrete the mixing of the materials should be first done in dry condition and after it wet condition. The two general methods of mixing are: hand mixing and machine mixing.
Transportation and placing of concrete: Once the concrete mixture is created it must be transported to its final location. The concrete is placed on form works and should always be dropped on its final location as closely as possible.
Compaction of concrete: When concrete is placed it can have air bubbles entrapped in it which can lead to the reduction of the strength by 30%. In order to reduce the air bubbles the process of compaction is performed. Compaction is generally performed in two ways: by hand or by the use of vibrators.
Question - 2 : - Describe Briefly The Various Methods Of Concrete Curing?
Answer - 2 : -
Curing is the process of maintaining the moisture and temperature conditions for freshly deployed concrete. This is done for small duration of time to allow the hardening of concrete.
The methods that are involved in saving the shrinkage of the concrete includes:
- Spraying of water: on walls, and columns can be cured by sprinkling water.
- Wet covering of surface: can be cured by using the surface with wet gunny bags or straw
- Ponding: the horizontal surfaces including the slab and floors can be cured by stagnating the water.
- Steam curing: of pre-fabricated concrete units steam can be cured by passing it over the units that are under closed chambers. It allows faster curing process and results in faster recovery.
- Application of curing compounds: compounds having calcium chloride can be applied on curing surface. This keeps the surface wet for a very long time.
Question - 3 : - Why Are Steel Plates Inserted Inside Bearings In Elastomeric Bearings?
Answer - 3 : -
In order to make a elastomeric bearing act/ function as a soft spring it should be made to allow it to bulge laterally and also the stiffness compression can be increased by simply increasing the limiting amount of the lateral bulging. In many cases in order to increase the compression stiffness of the bearing the usage of metal plates is made. Once steel plates are included in the bearings the freedom of the bulge is restricted dramatically, also the deflection of the bearing is reduced as compared to a bearing without the presence of steel plates. The tensile stresses of the bearings are induced into the steel plates. But the presence of the metal plates does not affect the shear stiffness of the bearings.
Question - 4 : - What is guniting ?
Answer - 4 : -
It is a process in which mixture of cement & sand in proportion of 1:3 is shooted on concrete surface with the help of cement gun under pressure of 2 to 3 kg/cm2. It is a highly effective process for repairing concrete walls or damaged surfaces.
Question - 5 : - What is the bending moment (BM) & Shear force (SF) – Explain.
Answer - 5 : -
A bending moment is the reaction induced in a structural element when an external force or moment is applied to the element causing the element to bend. The most common or simplest structural element subjected to bending moments is the beam.
Shear force is the force in the beam acting perpendicular to its longitudinal (x) axis. For design purposes, the beam’s ability to resist shear force is more important than its ability to resist an axial force. Axial force is the force in the beam acting parallel to the longitudinal axis.
Question - 6 : - What is the process of covering of concrete placed on the exposed top of an external wall ?
Answer - 6 : -
Coping
Question - 7 : - What is the minimum curing period?
Answer - 7 : -
IS 456 – 2000 recommends that curing duration of concrete must be at least 7 days in case of Ordinary Portland Cement, at least 10 days for concrete with Mineral admixtures. It also recommends that the curing duration should not be less than 10 days for concrete of OPC exposed to dry and hot weather conditions and 14 days for concrete with mineral admixtures in hot and dry weather.
Question - 8 : - What is the minimum weight of fine aggregate for sieve analysis as per ASTM C136 ?
Answer - 8 : -
300 g
Question - 9 : - How many hours should CBR samples be soaked ?
Answer - 9 : -
96 Hrs
Question - 10 : - What is a bearing capacity of soil?
Answer - 10 : -
Bearing capacity is the capacity of soil to support the loads applied to the ground by the foundation of the structure.