Building Materials MCQ Questions & Answers | Civil Engineering

Asbestos is a naturally occurring mineral fiber known for its excellent fire resistance and heat insulation properties.

It is classified as an incombustible and fireproof material, which is why it has been widely used in construction for insulation and fire protection.

Although asbestos is used in making corrugated roofing sheets, it itself is not a sheet but a material, so Option A is not correct.

Asbestos is not an organic substance; it is an inorganic mineral, so Option C is incorrect.

Therefore, the correct answer is an incombustible fireproof material.

Definition: In plastic bitumen, a filler is a fine material added to the bitumen mix to improve its binding properties and performance.

Role of filler: It increases the viscosity of bitumen, fills the voids, and enhances the strength and durability of the paving material.

Specific filler used: Asbestos powder is commonly used as the filler in plastic bitumen due to its fine texture, high resistance to heat, and good binding compatibility with bitumen.

Reason: The addition of asbestos powder improves the stability, wear resistance, and lifespan of the bituminous layer.

Conclusion: For plastic bitumen, asbestos powder is the standard filler material used to achieve the desired strength and performance.