Trumark Urban, Owner; Handel Architects, Architect 2016's winner: The Rowan

Nominations are now being accepted for the 2017 Slag Cement Project of the Year Awards. The Slag Cement Association (SCA) has been administering the Slag Cement Project of the Year Awards since 2010 to recognize projects in the USA for excellent and innovative use of slag cement.

Projects completed or scheduled to be completed between January 1, 2016, and December 31, 2017, are encouraged to apply before the deadline of Thursday, November 30, at 5PM EST. Winning projects will be honored at the American Concrete Institute’s Convention on March 25-29, 2018, in Salt Lake City, Utah, USA. Projects will be recognized in the categories of architectural design, durability, green design, high performance, innovative design, and sustainability. In addition to the in-person awards ceremony, winning projects also receive social media, digital, and print recognition. The SCA works to promote this awards program and the winning projects as models for more durable and resilient concrete construction.

“It is important to acknowledge the outstanding and innovative use of slag cement in projects across the USA,” stated Ed Griffith, President, Slag Cement Association. “The construction industry looks to these projects each year as examples of the increased durability, resilience, and sustainability that slag cement brings to a concrete’s mix design.”

Last year's winner, the Rowan, utilized exposed structural cast-in-place concrete as a key architectural design element. Located in the old industrial wing of San Francisco, CA, the Rowan consists of 71,500 sq. ft. of mixed-living and residential space.Slag cement was utilized in all concrete elements of the 5,200 yd3 structure, replacing 34% percent of the total cementitious material. The footing, column, and wall mixes consisted of ternary mixes with 50% replacement of cement to optimize workability and durability. The post-tensioned decks and tower crane pad mixes were a blend of Slag and Type III cement to reach strengths of 4000 psi (27.6 MPA) in 2 days.

Slag cement was used throughout the project – in all concrete mixes – for durability. The column, wall, and footing mixes consisted of ternary blends of cement, fly ash, and slag -- with slag making up 30% of the blend. Post-tensioned decks were a mix of Pronto Type III cement and 30% slag with a specification requirement of 3000 psi in 3 days. The crane pad and some elevated decks that required 4000 psi in 2 days were a 50/50 blend of Slag and Type III cement.

Trumark Urban, Owner; Handel Architects, Architect

Slag was crucial to the strength, speed, and constructability of the project. The strengths needed to keep pace with the accelerated schedule would not have been possible without the gains attributed to slag.

The architect purposefully wanted those on the street to see the structural components of the building. As a result, other than a few columns inside, the architect took all the structure to the exterior of the building maximizing tenant and rental space. The structural system, known as an exoskeleton is already turning heads, with the cast-in place concrete on full view.

For more information on the awards program, to download a nomination form, and to view past winning projects, visit the SCA website here. Completed nomination forms and any questions can be sent to SCA Marketing Coordinator, Drew Burns, at [email protected].