22305 Concrete Technology Viva Questions with Answers
1. Question 1. What
Are All The Types Of Cement?
Answer :
o
Ordinary Portland cement
o
OPC 33,OPC 43 and OP C53 grade
o
Rapid hardening cement
o
Extra rapid hardening cement
o
Sulphate resisting cement
o
Portland slag cement
o
Quick setting cement
o
Low heat cement
o
Portland pozzolana cement
o
Colored cement
2. Question 2.
Differentiate Dry Process And Wet Process Of Manufacturing Cement?
Answer :
o
Lime stone and clay are ground to fine powder
separately and are mixed together.
o
Water is added to make a thick paste which contains
14% of moisture.
o
The paste format are dried and off charged into a
rotary kiln.
o
The product obtained often calcination in rotary
kiln.
Process
o
The crushed raw materials are fed in to a ball mill
and a little water is added.
o
The steel balls in the ball mill pulverizer the raw
material which form a slurry with water.
o
The slurry is passed through storage tanks where
the proportioning of compound is adjusted to ensure desired chemical composition.
3. Question 3. Define
Batching, What Are All The Methods Of Batching?
Answer :
The measurement of materials for
making concrete is known as batching. Methods of batching Volume batching Weigh
batching.
4. Question 4. What
Are All The Raw Materials Of The Cement?
Answer :
o
Lime
o
Silica
o
Alumina
o
Calcium sulphate
o
Iron oxide
o
Magnesium oxide
o
Sulphur dioxide
o
Alkalis
5. Question 5. Write
Notes On Steam Curing?
Answer :
This approach is widely used in
precast concrete units.here the precast units are kept under warm and damp
atmosphere of a steam chamber.
6. Question 6. Define
Non Destructive Testing?
Answer :
Non destructive testing is done on
hardened concrete in non destructive testing methods soe properties of concrete
are used to estimate strength durability ,elastic parameters,crack depth micro
cracks and progressive deterioration of concrete.
7. Question 7. What
Are All The Types Of Concrete Test?
Answer :
Slump test compressive test split
tensile strength
8. Question 8. How Do
You Measure Concrete?
Answer :
Cubic feet, Cubic yards, Cubic Meter
9. Question 9. What Is
The Meaning Of Soil Reinforcement?
Answer :
Soil reinforcement is the act of
improving soil strength to enable it support or carry more load.
Two common examples
are:
o
Mixing a soil amendment such as lime into weak
clayey soil and re-comPActing to improve soil-bearing caPAcity (often done
under the road base in highway construction)
o
Installing plastic or composite webbing layers
(called geo-grid material) alternating with comPActed soil to produce a
stronger sloped soil structure (often done on steep roadway embankments to improve
strength and stability)
10. Question 10. What
Is Aggregate?
Answer :
Aggregate is the component of a
composite material used to resist compressive stress.
11. Question 11. What
Year Was The Keystone Power Plant In Indiana County Constructed?
Answer :
1967 began commercial operation on
unit 1.
12. Question 12. What
Is The Force Exerted By The Tacoma Narrows Bridge?
Answer :
The force exerted to the Tacoma
narrows bridge was initially the wind resistance. The wind resistance caused
the whole bridge to act as a system with forced vibration with damping.
13. Question 13. What
Are The Uses Of Alloys In Daily Life And How Are Alloys Made?
Answer :
Alloying is not always done to
produce a 'superior' material, but to produce materials having a desired
requirement in the industry or elsewhere. A classic case is of lead solder
(containing lead & tin), in which the melting point of the constituent
elements are lowered, not necessarily a desirable property.
Alloying can be carried out using hot
press method (a sheet of material is sandwiched with alloying material),
rolling the heated base metal in a drum full of alloying metal powder, using
hot spraying, galvanizing (dipping the base in a molten solution of alloying
material) etc. Sometimes the alloying material is added in small proportions to
the molten base metal (e.g., in production of different types of steel).
14. Question 14. What
Is The Worlds Largest Concrete Dam?
Answer :
The Grand Coulee Dam is said to be
the largest concrete dam. Currently the world's largest concrete dam is the
Itaipu Dam, an accomplishment of two neighboring countries, Brazil and Paraguay
in South America.
Though it is not finished yet, the
Three Gorges (Sanda pong) Dam on the Yangtze River in China will take over as
the largest upon its completion, which is slated for 2009.
15. Question 15. State
The Building Codes?
Answer :
These codes are the set of
specifications to ensure the safety associated with any building construction.
These codes are associated with the height, spacing, and installation of the
building. These codes play an important role in vacating the building in case
of any emergency situations.
From these interview questions, you will get an idea of the questions
interviewer can ask you in the civil engineering position interview. Refer to
some more sample questions here and revise all the answers carefully.
16. Question 16. What
Are The Steps Involved In The Concreting Process, Explain?
Answer :
The major steps
involved in the process of concreting are as follows:
o
Batching
o
Mixing
o
Transporting and placing of concrete
o
Compacting.
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.
17. Question 17.
Describe Briefly The Various Methods Of Concrete Curing?
Answer :
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:
o
Spraying of water: on walls, and columns can be
cured by sprinkling water.
o
Wet covering of surface: can be cured by using the
surface with wet gunny bags or straw
o
Ponding: the horizontal surfaces including the slab
and floors can be cured by stagnating the water.
o
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.
o
Application of curing compounds: compounds having
calcium chloride can be applied on curing surface. This keeps the surface wet
for a very long time.
18. Question 18. What
Do You Understand By “preset” During The
Installation Process Of Bridge Bearings?
Answer :
During the installation of bridge
bearings the size of the upper plates is reduced to save the material costs. This
process is known as preset. Generally the upper bearing plate comprises of the
following components:
o
Length of bearing
o
2 x irreversible movement.
o
2 x reversible movement.
The bearing initially is placed right in the middle point of the upper bearing plate. No directional effects of irreversible movement is considered. But since the irreversible movement usually takes place in one direction only the displaced direction is placed away from the midpoint. In such cases the length of the upper plate is equal to the length of the length of the bearing + irreversible movement + 2 x reversible movement.