Which construction technique involves placing fill or base course material in layers that are compacted?

The construction technique that involves placing fill or base course material in layers that are compacted is known as lifting. In this process, material is added in horizontal layers, or lifts, where each layer is then compacted before the next layer is placed. This technique ensures that the fill material achieves the necessary density and stability required for structural integrity. Proper lifting techniques prevent excessive settlement and maintain the overall stability of the constructed surface, which is crucial for infrastructure performance.

While backfilling involves filling in excavated areas, it does not specifically emphasize the layering and compaction aspect that lifting encapsulates. Compaction refers to the process of increasing the density of the material but does not highlight the layering required in the construction method. Layering, while it refers to the arrangement of the material, is not a defined construction technique in this context. It’s the act of lifting that clearly identifies both the process of placing material in layers and compacting them to achieve desired soil properties.