Definitions

1. noun

A layer of loose, crumbly soil or sediment that forms on the surface of a soil or a similar material.

“The laitance was visible on the new construction site, indicating the need for further soil stabilization.”

2. noun

A surface layer of concrete that has begun to flake off, typically due to weathering or wear.

“The laitance on the old bridge had to be removed before applying a new coat of paint.”