I'm donating this sawblade guy to to the Save Our Springs silent auction. Dec 12 in Austin.

 


     

 

 

benches and other functional outdoor deals


 

See the Weeping Madonna
and other water features

bird bath

moai

Olmec and Easter Island heads

return to grackle home page.

The term "concrete" means the mixture of cement and aggregates.

I make my carved concrete sculptures of gray and/or white Portland cement (about $6 to $10 for a 90-lb bag at Home Depot) mixed with: one or more aggregates, including granite sand, regular sand, perlite, marble dust, rubble from previously carved sculptures, vermiculite, and sandy loam; colorants, usually oxides, which I get at Armadillo Clay in Austin; and water. They are cast in blocks and then carved after the concrete sets up but before it becomes too hard to carve. This window of time can begin anywhere from 4 to 48 hours after the concrete and aggregates are mixed with water and last anywhere from about 2 hours to several days. A number of factors influence the rate at which the mixture sets up and then hardens. These include air temperature, humidity, temperature of the water, nature and quantity of the aggregates used. Containers used to cast blocks can be cardboard boxes, detergent tubs, milk cartons, whatever is handy. I also make some items using rubber molds, with rubber I mail-order from Smooth-On. I've used their product called Omoo-25.

For very large sculptures, I start with a Styrofoam core wrapped in wire mesh and layer the concrete mixture onto it. I've also done a few fiberglass molds. A very stinky and unpleasant process.

One good book on the subject of creating art from concrete is: Making Concrete Garden Ornaments by Sherri Warner Hunter. Available through Amazon.com or better still your local independent bookstore, such as Bookpeople in Austin.

You could do it yourself! Be sure to wear rubber gloves and a dust mask though.

KUDOS