1-What are the tests for concrete?
Compressive strength test, Slump test, water permeability test, Water absorption test.
2-What is the least Cover for various members of the RCC?
Footing = 50 mm, Column = 40mm, Beam = 25mm, Slab = 20mm
3-How does the one-way slab and two-way slab differ?
One way slab: Ratio of Longer Span / Shorter span > 2
Two way slab: Ratio of Longer span/ shorter span <= 2
4-What is Steel’s unit weight?
The unit weight of Steel is 78.5KN/m3
5-What do the moment of inertia mean?
It’s the quantity expressing a body’s tendency to resist angular acceleration, which is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.
6-Can you list the different steps required in the process of concreting?
The main steps involved in the concreting process are:
• Transporting and placement of concrete
7-What are the different methods of Concrete Curing?
The curing method ensures that the moisture and temperature requirements for newly used concrete are maintained. This is done over a short time, so that concrete can be hardened.
The techniques used to save the concrete shrinkage include:
Water spray: sprinkling water may be used to cure walls and columns.
Wet cover: can be cured with wet gunny bags or stroke using the surface
Ponding: the slab and floors can be cured by stagnating water on horizontal surfaces.
Steam curing: steam can be cured of pre-fabricated concrete units by passing it under closed chambers over the units. It makes it possible to curve quicker and to recover more quickly.
Use of curing compounds: calcium chloride compounds on curing surfaces may be used. That keeps a very long time the surface wet.
8-What are the different types of slump tests?
Slump tests are carried out to evaluate the working capacity of new concrete on an empirical basis. The consistency of the concrete is measured. In the slump tests, there are usually three different kinds of slumps.
True Slump: the general drop in concrete mass is characterized by this kind of slump without visible signs of deterioration or disintegration.
Shear Slump: It indicates that the concrete mix is deficient in cohesion. This type of slump leads to segregation and bleeding. Henceforth, in the long run, affecting the durability of the concrete.
Collapse Slump: This type of slump indicates that the mix of concrete is simply too wet. The mix is considered to be harsh and lean.
9-What are the column functions in the building?
The column is a verticle member in the building whose primary function is to support the structural load and transfer it through beams. Upper columns transfer the load to the lower columns and finally to the ground through footings.
10-What is the difference between the method of working stress and limit state method?
Working stress method is an elastic design method in which structure is designed to bear the load up to the elastic limit. Whereas, limit state method is a plastic design method in which structure is designed to bear the load beyond the plastic limit.
11-What are the types of foundation used in construction?
There are two main types of foundation: Shallow and Deep foundation. Shallow foundation can be classified as spread footing, combined footing, strap or cantilever footing and finally mat or raft footing. Deep foundations can be classified as pile footing, pier footing, caissons footing and well foundation.
12-What do you mean by M20?
M stands for Mix & 20 stands for 20 kN/mm2 which is characteristics strength of concrete.