surface retarder

surface retarder

A retarder applied to the surface of newly placed concrete or to form-work; used to (a) delay setting of the cement, (b) facilitate the production of exposed aggregate finish, or (c) facilitate construction joint cleanup.
References in periodicals archive ?
It transfers custom or stock patterns as a surface retarder via membrane placed at the bottom of the form.
Effective January 1, 2014, there are new VOC limits for the following coatings: Concrete Surface Retarder, Dry-Fog Coatings, Clear Topcoats for Faux Finishing Coatings, Trowel Applied Faux Finishing Coatings, Fire-Proofing Coatings, Form Release Compound, Graphic Arts (Sign) Coatings, Mastic Coatings, and Metallic Pigmented Coatings.
The 'printed' effect on the concrete panels is achieved by applying a surface retarder to a special membrane which was spread on the mould table when the concrete panels were cast.