Decorative Concrete, First Place
Qatar National Library, Doha, Qatar
Nominated by: Qatar Chapter – ACI
Owner: Qatar Foundation
Architect: Office for Metropolitan Architecture (OMA)
General Contractor: Multiplex Construction W.L.L
Concrete Contractor: Readymix Qatar LLC
The Qatar National Library is one of the first buildings in Qatar with cast-in-place white concrete, so the challenges faced on
this project were workability, placing methodology/sequence, and finishing. To provide an unobstructed view and vast plaza
space within the building, the entire roof is supported by 1.2 m (4 ft) diameter columns. To transfer loading, multiple columns
required a structural steel cruciform to be cast embedded for the structural connection. With some columns 18 m (59 ft) high,
multiple placements were required.
Decorative Concrete, Second
Metro State University of Denver –
Aerospace and Engineering Science
Building, Colorado, United States
Nominated by: Rocky Mountain Chapter – ACI
Owner: Metro State University of Denver
Architect: Anderson Mason Dale Architects
Engineer: KL&A Structural Engineers, Inc.
General and Concrete Contractor: GH Phipps
Concrete Supplier: Ready Mixed Concrete
Ten different mixture proportions were used
for this project, including a polished concrete
mixture that could not be placed by pumping.
The high-end polished mixture consisted of a
1/2 in. (13 mm) chip black aggregate with 62%
coarse aggregate that had to be ground down
1/4 in. (6 mm) deep to simulate terrazzo stone.
The mixture was placed by buggy, which also
ensured that the surface was finished slowly
and consistently so the floor flatness remained
high and the aggregate was not pushed down
due to overfinishing.
www.concreteinternational.com | Ci | NOVEMBER 2019 23