The American Concrete Institute has named the 2020 ACI award winners for Excellence in Concrete Construction. They were honored Oct. 26 during the Institute’s Virtual Concrete Convention.
Taking the highest honor was the Kennedy Center expansion project in Washington, D.C.
This expansion project, known as The Reach, includes three new outdoor venues — the Welcome, Skylight and River pavilions. They are situated on a 4.6-acre campus along the Potomac River. Moreover, the structures feature board-formed concrete, sweeping curves and crisp clean lines that complement the existing center.
Kennedy Center traits
To achieve this project’s brilliant-white concrete finish, the contractors used a mixture of white sand, white aggregate, titanium oxide and Aalborg White cement. Lehigh White Cement Co., a U.S. affiliate of Cementir Group, supplied the cement.
The pavilions all interconnect below-grade under a green roof where visitors can meander through the labyrinth of concrete curves. In addition, a variety of elevated decks caps the new venue’s entire footprint. For instance, they include slabs that are conventional, saw-toothed, void “bubble,” curved and post-tensioned. Subsequently, the long-reaching spans and concrete waves blend with the landscape.
Of particular interest inside, multiple board-formed patterns and custom-made “crinkle” form liners also add to the architectural concrete’s texture. While the “crinkle” concrete creates a wonderful acoustic effect in the performance and rehearsal rooms, the visual effect is stunning.
The ACI Excellence in Concrete Construction Awards were created to honor the concrete industry’s most creative visions and projects. They also provide a platform to recognize concrete innovation, technology and excellence across the globe. To be eligible to participate in these excellence awards, an ACI chapter or international partner must nominate the project.
In conclusion, an independent panel of esteemed industry professionals judged the projects. They selected the winners based on architectural and engineering merit. Overall, they judged for creativity, innovative construction techniques or solutions, innovative use of materials, ingenuity, sustainability, resilience and functionality.
And the winners are …
In addition to the Kennedy Center, the other 2020 winning projects are:
First place: Hudson Commons/441 Ninth Ave., New York
The Hudson Commons project in New York City clearly demonstrates “thinking outside of the box.” Overall, the Cove Property Group, Kohn Pedersen Fox and Pavarini McGovern team modernized the eight-story warehouse. For instance, they added 17 stories, creating a modern “Class A” commercial office building. They also outfitted it with abundant lighting, high ceilings, outdoor terraces and other amenities that appeal to today’s tenants.
After demolishing the original building’s full interior, Pavarini McGovern then opened floor slabs to install a new structural core. The team then reinforced the existing foundations and columns to support the tower. Subsequently, the new design significantly brightens the existing building, with glass panels on the first floor and expanded windows throughout. The addition includes an all-glass façade and expansive ceiling heights to ensure tenants get plenty of natural light also.
Project Team Members: Owner: Cove Property Group; Architectural Firm: Kohn Pedersen Fox Associates; Engineering Firm: WSP Parsons Brinckerhoff; General Contractor: Pavarini McGovern; Concrete Contractor: Regulator Construction Inc.; Concrete Supplier: NYCON Ready Mix.
Second place: W Hotel Tower, Washington
First place: Science Complex—Campus MIL, Québec, Canada
The Université de Montréal’s Complexe des sciences was inaugurated Sept. 20, 2019, three years after the groundbreaking ceremony. Eventually, this unique site, totaling nearly 645,800 square feet (60,000 square meters), aims to achieve LEED NC Gold certification. Devoted to teaching and research, it brings together more than 35 research chairs.
Located on the site of the former Canadian Pacific marshaling yard, it’s in the northeast sector of Outremont. Above all, the complex marks the beginning of the revitalization of an entire area “in the middle” of the Island of Montréal. Consequently, it got the name MIL (milieu de l’île de Montréal).
Project Team Members: Owner: Université de Montréal; Architectural Firms: Menkès Shooner Dagenais LeTourneux Architectes; Lemay, and NFOE Architectes; Engineering Firm: SDK et associés; General Contractor: EBC Inc.; Concrete Contractor: Sorel-Tracy Ciment; Concrete Supplier: Lafarge.
Second place: 725 Ponce, Georgia
First place: Kennedy Center Expansion Project, Washington, D.C.
Project Team Members: Owner: U.S. Government; Architectural Firm: Steven Holl Associates; Engineering Firm: Silman; General Contractor: The Whiting-Turner Contracting Co.; Concrete Contractor: The Lane Construction Corp.; Concrete Supplier: Vulcan Materials.
Second place: Amélioration des infrastructures de l’Assemblée nationale du Québec, Québec, Canada
First place: King Abdullah Petroleum Studies and Research Center, Saudi Arabia
KAPSARC in Riyadh, Saudi Arabia, is a premier, globally recognized center for energy, environmental research and policy studies. The facility covers an area of 753,470 square feet (70,000 square meters). Overall, it includes the Energy Knowledge Center, Energy Computer Center, Conference Auditorium, Research Library and Prayer Hall.
The main KAPSARC building consists of a concrete-framed structure with a basement and three floors. in particular, its envelope consists of glass fiber-reinforced concrete cladding panels and glazing attached to steel frames.
The center encompasses a cellular, partially modular system that integrates different buildings as a single assembly with interconnecting public spaces. Additionally, the hexagonal honeycomb structures use the least material to create a lattice of cells within a given volume.
This structural and organizational principle determined the building’s composition as a mixture of crystalline forms. Moreover, these forms emerge from the desert landscape, evolving to best respond to environmental conditions and internal functional requirements. As a result, the honeycomb grid compresses toward its central axis. It serves as an extension to the west of the natural wadi, watercourses that are dry except during rainy periods.
Project Team Members: Owner: Saudi Aramco; Architectural Firm: Zaha Hadid Architects; Engineering Firm: Arup Group; General Contractor: Drake & Scull International (DSI); Concrete Contractor: Gulf Elite General Contracting; Concrete Supplier: Saudi Ready-Mix Concrete Co.
Second place: SSENSE MONTRÉAL, Québec, Canada
First place: Alaskan Way Viaduct Replacement Program, State Route 99 Tunnel, Washington
The largest North American soft-ground bored tunnel, the 2-mile (3.2-km) State Route 99 tunnel has a 52-foot (16-meter) excavated diameter. It replaced the aging Alaskan Way Viaduct as a critical part of one of the U.S.’s largest infrastructure projects.
The tunnel’s alignment runs under 158 downtown Seattle buildings. These include single-story structures and high-rises, as well as at-grade and elevated roadways. It also runs under active bridges and a railroad tunnel, several large sewers, and public and private utilities.
The tunnel’s 32-foot-wide (10-meter) roadways carry two southbound lanes atop two northbound lanes. Additionally, the tunnel features state-of-the-art fire detection, fire suppression and ventilation systems, and a security system with closed-circuit TVs. It also has a separate, completely pressurized evacuation area with its own ventilation system — the first of its kind.
Project Team Members: Owner: Washington Department of Transportation (WSDOT); Architectural Firm: HNTB Corp.; Engineering Firm: HNTB Corp., lead engineer of record; General Contractor and Concrete Contractor: Seattle Tunnel Partners, joint venture of Dragados USA Inc. and Tutor Perini Corp.; Concrete Supplier: CalPortland.
Second place: Samuel de Champlain Bridge, Québec, Canada
Repair and Restoration
First place: Conococheague Aqueduct Rehabilitation, Maryland
The Conococheague Aqueduct on the Chesapeake and Ohio Canal in Williamsport was restored with both historic and modern materials and methods. This water-filled, three-arch bridge carried canal boats over the Conococheague Creek during 1835 through 1924.
In 1920, a canal boat broke through one of the aqueduct’s stone walls and then fell to the creek below. Subsequently, a timber wall with outriggers replaced it. The repair served until 1924 when two floods caused the aqueduct to permanently close.
The modern restoration included repairing existing stonework, building a concrete channel and also installing timber outriggers replicating the 1920s bridge. Moreover, a new canal-turning basin and the aqueduct’s water restoration, the rehabilitation project has opened the way for visitors. As a result, it allows them to ride a boat across the historic Conococheague Aqueduct and through a working canal lock.
Project Team Members: Owner: National Park Service; Engineering Firm: McMullan & Associates; General Contractor and Concrete Contractor: Corman Kokosing Construction Co.; Concrete Supplier: Thomas, Bennett & Hunter Inc.
Second place: Berri-Sherbrooke Underpass Rehabilitation, Québec, Canada
Do you have a project worthy of ACI recognition? If so, entries for the 2021 Excellence in Concrete Construction Awards are being accepted now through April 19, 2021. For more information, visit aciexcellence.org for more information.