What is the aggregate transfer method of making architectural concrete?
Aggregate transfer is a method for applying a special aggregate to the surface of the concrete only. The method is to bond the aggregate to the surface of a form, usually plywood, using a low-strength adhesive that slowly softens when rewetted. The adhesive is painted onto the form and the aggregate sprinkled or hand placed over it. The adhesive is allowed to harden and the forms are put in place. Concrete is cast in the forms and when the forms are stripped the aggregate remains more tightly bonded to the concrete than to the forms so that is remains on the surface of the wall.