Far right: Greg Demmert's polished slab included white color hardener and four colors of crushed glass. Embedded glass can create a nice effect when polished to 3000 grit. Right: A large floor-model planetary-head diamond polisher removed approximately 1/16 inch of concrete to reveal the decorative finish.
Far right: Greg Demmert's polished slab included white color hardener and four colors of crushed glass. Embedded glass can create a nice effect when polished to 3000 grit. Right: A large floor-model planetary-head diamond polisher removed approximately 1/16 inch of concrete to reveal the decorative finish.

Two presenters and a designer were involved in this demo. An artist, Vickie Jackson, Oklahoma City, designed the work, and Doug Bannister, The Stamp Store, Oklahoma City, installed the decorative materials during the concrete placement. He cut patterns in thin plastic masks, through which volunteers embedded 3/8- to 1/8-inch light blue, dark blue, white, and black crushed glass to create a patterned look. Workers also dusted on white color hardener to provide additional interest in some areas. After finishing, however, the special features were below the surface, and the slab looked like plain concrete.

Demmert then used a planetary-head floor polishing machine on the minimum 4000-psi concrete. Starting with 40-grit diamonds, he doubled the grit size with each pass, finishing with 3000 grit. The grinding operation was performed dry, with a vacuum system collecting all the dust. The final step was to apply a blue dye in an acetone solvent on all areas expect the white color hardened areas, to bring the coloration together.

View other 2005 Artistry in Concrete participants.