Architectural Record - Image Gallery
Photo Courtesy Graphic Concrete
Concrete + Masonry
According to Jutta Telivuo, head of communications and marketing for Graphic Concrete, the patterns on the surface of the archive result from the contrast between the fair-face concrete surface and the aggregate of the exposed surface. The Graphic Concrete technology involves applying a surface retarder to a special membrane in order to slow the hardening of the concrete in certain areas. After the membrane is spread on the mold, the concrete is cast on it. The next day, the concrete element is lifted into an upright position and the membrane is removed. The unset, softer concrete surface is then high-pressure washed, revealing the fine aggregate finish of the design. The concrete for this project, a black aggregate with white cement, is commonly used in Finland. While normally the patterns are “washed visible,” the team reversed the process, washing the background visible. “The main reason for this was to get as much contrast as possible between background and patterns and to have black facades,” says Puumala. [cont.]

[Reader Service: February 2010 #200]