Asphalt milling encompasses various techniques employed to remove damaged or unwanted asphalt layers from roads and other paved surfaces. These techniques utilize specialized equipment to efficiently and precisely mill the asphalt, ensuring a smooth and level surface for subsequent repairs or resurfacing.
Cold milling involves the use of a rotating drum equipped with cutting teeth to grind the asphalt into small particles. This technique is commonly utilized for removing thick asphalt layers or when precise depth control is required, as with leveling existing surfaces.
In hot milling, a heated drum is employed to both cut and soften the asphalt. The softened asphalt is then removed using a vacuum system. Hot milling is typically used for removing thinner asphalt layers or when the material is excessively hardened.
Partial-depth milling removes only a portion of the asphalt layer, typically between 1 to 3 inches. This method is ideal for addressing surface imperfections or rutting, while preserving the underlying asphalt base.
Full-depth milling removes the entire thickness of the asphalt layer, down to the subgrade. This technique is commonly used for complete asphalt replacement or when the existing layer is severely damaged or contaminated.
The selection of a particular asphalt milling technique is influenced by factors such as the thickness of the asphalt layer, the severity of the damage, and the desired smoothness of the final surface. Cold milling is suitable for most applications, while hot milling is preferred for hardened asphalt or thin layers. Partial-depth milling is ideal for localized repairs, and full-depth milling is reserved for complete replacements.