Building Materials - Study Mode

Explanation

Solution: 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.