How much concrete is allowed to be removed from around the base of the mold before lifting?

The guideline for lifting a mold after concrete has been placed is quite strict because the integrity of the concrete can be compromised if any part of it is disturbed or removed before the appropriate curing time. Removing any concrete from around the base of the mold can lead to a number of issues including voids, compromised strength, or deformation of the mold itself.

Maintaining the integrity of the concrete surrounding the mold is essential for ensuring that the sample obtained is representative of the intended final product and meets the required specifications. Consequently, the appropriate practice is to avoid removing any concrete at all from around the base of the mold prior to lifting. This ensures that the sample maintains its intended dimensions and structural strength as it is being tested.