What process involves adding material to raise the elevation of a roadbed?

The process that involves adding material to raise the elevation of a roadbed is known as fill. This technique is commonly employed in highway construction and civil engineering to create a stable foundation or to elevate the roadway above surrounding areas, ensuring proper drainage and structural integrity. Using fill material can involve various substances, including soil, gravel, or manufactured materials, depending on the engineering specifications and the intended use of the roadway.

Fill is critical in scenarios where existing topography does not meet the desired road elevation or where structural support is needed. By introducing fill, engineers can shape the landscape to facilitate better traffic flow and enhance safety. Proper compaction and selection of fill material are also vital, ensuring that the added elevation is stable and durable enough to withstand the weight of vehicular traffic over time.

Other processes, such as excavation, refer to removing material rather than adding it, while grading is more about leveling and shaping the existing surface without necessarily raising the elevation. Compiling does not relate to this context in terms of construction practices. Therefore, fill specifically addresses the need to elevate the roadbed effectively.