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80 on the Commons
The playful yet sophisticated use of a herringbone pattern results in a standout, bold style that NBBJ wanted to capture on this civic asset in the city’s central open space.
Continuing in the style of the black façade on the top eleven stories, the white panels at ground level begin with linear lines and gradually fade to a smooth finish. The transition from a smooth finish to a heavily textured panel gives the ground level a clean ordered look in contrast to the beauty of the organized chaos above. The white mix used as the deep contrast is captured throughout the façade from the balconies to the back of the building’s recessed design were all achieved using precast concrete.
Scattered among the levels are cantilever balcony decks protruding straight out from the structure of the building. No support brackets or elements are needed for these precast slabs due to the design, therefore providing the visual of a floating deck. The severe contrast of the two colors helps deliver the architect's design intent.
The result of the refined material palette and texture of the pattern used is one of the unique features of the building. The custom formwork makes the surface appear as if it is changing throughout the day due to the shadow with the sun. Depending on the angle, the layout gives off an impression where sections appear as different shades of a black concrete mix, when in fact, it’s not.
5th and Race
The new mixed-use structure at 5th & Race Street in Cincinnati, Ohio, gives visitors the impression that they can see right through the building. Designers of the 280,000 ft² facility, elegantly merged broad windows and precast concrete panels to create a light and elegant building that reflects the blue sky during the day, and golden street lights at night, while giving residents a strong, open space for their offices and retail.
The building, titled 84.51° Centre, includes a 1000-space, four-story parking garage at the base topped by four stories of commercial space. Precast concrete was chosen to achieve the owners’ durability, accelerated timeline, and aesthetic goals, says Glenn Ebersole, P.E., Market Development Manager of High Concrete Group, the precaster on the project. “By using architectural precast panels we were able to provide the dark color and avoid the repetitiveness of patterns while limiting erection time.” The dark color of the precast concrete was created by combining black granite coarse aggregate with black sand in the mix. The panels were acid etched to provide a soft texture, sometimes referred to as sugar cube texture. The acid etch finish also enables the sand to sparkle in the sun, providing glints of light and visual interest to passersby.
“The use of precast to provide ventilation on the garage level helps camouflage the fact that the lower levels of the building are a garage and it creates a unified facade,” says Michael Zensen, Associate Vice President, CannonDesign, one of the judges of the 2016 PCI Awards committee. The horizontal reveal pattern provided the desired modern, industrial look, and random non-symmetrical window openings combined with reveal accents added visual interest.