Durability of Concrete
Trending Questions
Q. The durability of concrete is proportional to :
- Sand content
- Water-cement ratio
- Cement-aggregate ratio
- Aggregate-water ratio
Q. Which one of the following is correct regarding the most effective requirements of durability in concrete?
- Providing reinforcement near the exposed concrete surface
- Applying a protective coating to the exposed concrete surface
- Restricting the minimum cement content and the maximum water cement ratio and the type of cement
- Compacting the concrete to a greater degree
Q. The minimum content of cement specified by IS456−2000 in concrete work with normal weight aggregate of 20mm nominal maximum size is
- Independent of exposure conditions
- Independent of grade of cement used
- Independent of type of concrete i.e., plain or reinforced concrete
- None of the above
Q. Durability of construction material is
- Resistance to crushing
- Resistance to weathering
- Shear strength
- Compressive strength
Q. Which of the following grades of concrete in R.C.C. is recommended for severe exposure conditions by BIS ?
- M 20
- M 25
- M 30
- M 15
Q. Permeability in concrete is studied towards, providing for, or guarding against, which of the following features?
1. The penetration by materials in solution may adversely affect the durability of concrete; moreover, aggressive liquids 'attack' the concrete.
2. In case of reinforced concrete, increase of moisture and air will result in corrosion of steel leading to an increase in volume of steel. resulting in cracking and spilling of the concrete cover.
3. The moisture penetration depends on permeability and if the concrete can become saturated with water it is less vulnerable to frost action.
1. The penetration by materials in solution may adversely affect the durability of concrete; moreover, aggressive liquids 'attack' the concrete.
2. In case of reinforced concrete, increase of moisture and air will result in corrosion of steel leading to an increase in volume of steel. resulting in cracking and spilling of the concrete cover.
3. The moisture penetration depends on permeability and if the concrete can become saturated with water it is less vulnerable to frost action.
- 1, 2 and 3
- 1 and 2 only
- 1 and 3 only
- 2 and 3 only
Q. The size of aggregate, particle shape, colour, surface texture, all of which have influence on the durability of concrete should conform to :
- IS 383 - 1970
- IS 1489 - 1976
- IS 12269 - 1987
- IS 456 - 2000
Q. Which of the following expression correctly represent the overall cost of a roof system 'C'.
[s = spacing of the trusses and k1, k2, k3 are constants]
[s = spacing of the trusses and k1, k2, k3 are constants]
