Civil Engineering - Building Materials

6.
Ultimate strength to cement is provided by
Tricalcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite.
Answer: Option
Explanation:
Dicalcium Silicate (C2S): This compound will undergo reaction slowly. It is responsible for the ultimate strength of concrete. This is also called as Belite. The heat of hydration is 260 J/Cal. Its proportion is 25 - 40%.

7.
Elastomers can extend upto
five times their original dimensions
seven times their original dimensions
ten times their original dimensions
three times their original dimensions.
Answer: Option
Explanation:
Elastomers are a type of polymer that are known for their ability to stretch and deform under stress and then return to their original shape when the stress is removed. This property, called elasticity, is what gives elastomers their name. Elastomers can stretch to great lengths, often up to ten times their original dimensions, without breaking or permanently deforming. This makes them useful in a variety of applications, such as seals, gaskets, and shock absorbers, where a flexible and durable material is needed.

8.
Bitumen felt
is used as water proofing material
is used as damp proofing material
is made from bitumen and hessian fibres
all the above.
Answer: Option
Explanation:
Bitumen felt is a type of building material that is used for water proofing and damp proofing. It is made from bitumen, a sticky, black, semi-solid form of petroleum, and hessian fibres, which are made from jute or other natural fibres. Bitumen felt is typically used to protect roofs, walls, and other structures from water damage by providing a barrier that prevents water from penetrating the surface. It is also used to prevent dampness and condensation from forming inside buildings by allowing moisture to escape from the structure. Bitumen felt is typically applied in thin layers using a hot asphalt or tar application process, which helps it bond to the surface and form a watertight seal.

9.
In the method of condensation polymerization,
low-molecular substances are removed from the high molecular substance
the reaction proceeds with an evolution of ammonia
the reaction proceeds with an evolution of hydrogen chloride
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

10.
In the cement the compound quickest to react with water, is
Tricalcium aluminate
Tetra-calcium alumino-ferrite
Tricalcium silicate
Dicalcium silicate.
Answer: Option
Explanation:
No answer description is available. Let's discuss.