Thomas Concrete Group delivered

Monolithic Sculpture in Concrete
Looks like Steel

The 36-feet high sculpture called Stealth, with its sharp edges, lustrous surfaces and twisted forms gleams as if it is made of steel. But looks deceive, because it’s composed of black concrete. The sculpture stands in downtown Atlanta in the United States, and is made from a special concrete developed by the Swedish family owned company, Thomas Concrete Group.


The artist's goal was to create an urban portal symbolizing the changing cityscape around Atlanta’s Midtown Arts Center. The result is a carbon-black, polished monolithic concrete sculpture, defined by stunning curved forms.

Work on the project began more than two years ago, led by artist and architect Tristan Al-Haddad, the owner and creative force of Formation Studios, and also Assistant Professor at the Georgia Institute of Technology’s School of Architecture in Atlanta along with structural engineer Jim Case of Uzun and Case.  Al-Haddad, and his team of 11 at Formation Studios, first created a 3D parametric model, and then constructed the complex formwork in which the sculpture would be cast by using a hybrid of digital manufacturing technologies and manual craft.

Recently inaugurated, Stealth weighs almost 100 tons and is made of 52 cubic yards of concrete and eight tons of steel reinforcing bars. The casting process was a challenge. Each reinforcing bar had to be cut by hand, then bent and placed in position with extreme precision.

The special purpose concrete from Thomas Concrete Group was poured successively into each section of the formwork by The Sinclair Construction Group. The concrete had to have high strength and meet stringent design requirements, while having the ability to flow into the sharply angled shapes of the structure.  It also had to be highly resistant to cracking over time.

Experts at Thomas Concrete Group were able to meet Stealth’s design requirements by developing a concrete based on black sand from a special limestone, with iron oxide and carbon pigments and synthetic macro fiber reinforcement. This exclusive mix gives Stealth its deep black color. After casting, the sculpture was diamond-honed to remove any imperfections, and the entire surface was wet polished to obtain the sheer, reflective finish in blue-black.

"We worked for months to create the high-performance concrete product that met the requirements of such a visually appealing design,” says John Cook, Director of Technical Services at Thomas Concrete Inc. “It took several different recipe and material combinations to achieve the desired appearance and performance.”

Thomas Concrete Group’s headquarters and development center are located in Gothenburg, Sweden. The Group is engaged in manufacturing concrete products in Sweden, Germany, Poland and USA.

For more information contact:

Alan Wessel,
President and CEO, Thomas Concrete Inc
Phone: +1 770 438 6980

Hans Karlander,
President and CEO Thomas Concrete Group AB
Phone: + 4610 450 50 00

High resolution photos can be downloaded here: