Civil Engineering Interview Questions and Answers
Question - 11 : - What do you mean by honeycomb in concrete?
Answer - 11 : -
Honeycomb, also known as air pocket, is nothing but the air voids in concrete. It is usually formed during concrete casting.
Question - 12 : - What field tests are required for quality check of cement?
Answer - 12 : -
Quality of cement can be checked with color, physical properties, etc. Cement should have grey color with light greenish shade. It should feel smooth when rubbed between fingers. If hand is inserted in a heap of cement or its bags, it should feel cool. When pinch of cement is thrown in Water then cement should float for some time before it sink. Also, it should be lump free.
Question - 13 : - What are the types of cement?
Answer - 13 : -
There are various types of cement which are: Ordinary Portland Cement (OPC), White Portland Cement (WPC), Portland Pozzolana Cement (PPC), Low Heat Portland Cement, Coloured Portland Cement, Hydrophobic cement, Rapid Hardening Cement, Portland Slag Cement, Sulphate resisting Portland Cement, etc.
Question - 14 : - what is the difference between built area and super built up area?
Answer - 14 : -
• Built up area: It includes your carpet area plus area covered by walls, pillars and ducts. It is usually 10% more from the carpet area
• Super built up area: It includes your built up area plus the area that you use as building amenities like passage to lift, stairs and lifts, gym, club, etc.
Question - 15 : - What is Water-Cement Ratio and How it is related to the strength of concrete?
Answer - 15 : -
The water-cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads to higher strength and durability, but may make the mix difficult to work i.e. low workability of Concrete Mix. Workability can be increased with the use of admixtures.
Question - 16 : - Explain what is Hybrid Foundation?
Answer - 16 : -
Hybrid Foundation is usually used for high rise building, it contains both soil supported mat and piles. This type of foundation is helpful in reducing the amount of the settlement.
Question - 17 : - Explain what is flashing?
Answer - 17 : -
Flashing is an extended construction that is done to seal and protects joints in a building from water penetration. Flashing is installed at the intersecting roofs, walls and parapets.
Question - 18 : - What is Bursting Reinforcement ?
Answer - 18 : -
Tensile stresses are induced during prestressing operation and the maximum bursting stress occurs where the stress trajectories are concave towards the line of action of the load. Reinforcement is needed to resist these lateral tensile forces.
Question - 19 : - What are the major problems in using pumping for concreting works?
Answer - 19 : -
In pumping operation, the force exerted by pumps must overcome the friction between concrete and the pumping pipes, the weight of concrete and the pressure head when placing concrete above the pumps. In fact, as only water is pump-able, it is the water in the concrete that transfers the pressure.
The main problems associated with pumping are the effect of segregation and bleeding. To rectify these adverse effects, the proportion of cement is increased to enhance the cohesion in order to reduce segregation and bleeding. On the other hand, a proper selection of aggregate grading helps to improve the pump-ability of concrete.
Question - 20 : - What are the responsibilities of a construction manager?
Answer - 20 : -
The responsibilities of a construction manager are
• Cost Estimates
• Pre-purchase of selected materials
• Selection of bidders for bidding phase
• Analysis of proposals
• Construction contract negotiations
• Construction Scheduling and Monitoring
• Cost control of construction
• Construction supervision