What type of backfill should be used after concrete forms have been removed?

When selecting backfill after the removal of concrete forms, sand is often the preferred material due to its excellent drainage properties and ease of compaction. Sand has a granular structure that allows water to pass through easily, reducing the risk of water pooling near foundations and other structures. This drainage minimizes the potential for soil saturation, which can lead to erosion or stability issues over time.

Additionally, sand is lightweight compared to other backfill materials, making it easier to handle and compact in the confined spaces typically found around concrete foundations. Its ability to settle uniformly allows for a stable environment as it fills the void left by formwork, aiding in the overall stability of the structure.

Using alternatives like clay or gravel may lead to issues. Clay, while providing good support once compacted, can retain moisture and create expansive soil conditions, which are not ideal for backfill. Gravel, although effective for drainage, can be too loose and may not provide the same level of support as sand, especially in fine formats that are desired for compacting around concrete structures.

Opting for sand aligns with best practices in construction for ensuring both effective drainage and structural integrity after forms are removed.