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Denver Union Station Block A

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Colorado, USA
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Vertical / High-Rise
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26 months
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12 Story - 364,300 sq. ft.
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BOKA Powel
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Semple Brown Design
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Thornton Tomasetti
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GE Johnson
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Concrete Frame Associates
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A major project in Downtown Denver's Union Station redevelopment area was Hotel and office space. As a part of Denver's massive Union Station Transit Center project, this project was on one of the prime development sites with an L-shaped parcel located at the east corner of 16th and Wewatta Street.
It is immediately adjacent to Union Station's new dramatic white canopy Train Hall, where several RTD commuter rail lines and Amtrak trains arrive.
  • A 12-story, 200-room Hotel included over 8,300 SF meeting rooms, adjacent pre-function space, street-level and rooftop outdoor patios, and two restaurants with podium-level outdoor spaces.
  • A 53,000 SF, five-story boutique office building with 12,500 SF floor plates, is designed for smaller firms looking to locate in the Union Station area, plus three ground-floor retail spaces.
  • A two-level, 210-space underground parking structure. One hundred spaces will be reserved for general public parking.
One of the unique parts of this project is that it has two fronts: one facing 16th Street, the other facing the commuter rail platforms at Union Station. Finally, another important aspect of this project is that it will provide a public walkway between the hotel and office buildings that goes directly from the commuter rail platforms to the 16th Street Mall and a planned RTD Mall Shuttle stop.
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Project Challenges

The unique shape of the project brought several challenges. Functionally, two different buildings were under construction at the same time. This complexity created a complex pour schedule with twenty-one mixes used across the project. There were several unique structural and architectural elements on the project, which called for the creation of some specialized mixes.

Project Solutions

BURNCO created a matrix-based system to aid the project team in keeping the immense number of different mixes organised. We also worked with the project team to successfully provide a lightweight concrete mix using 3lbs of macro fibres pumped over 200+ feet through a 3" line to the delivery point.
The mix needed to be high enough in slump to flow through the system but stiff enough to hold shape on the slanted ramps of the parking garage. Finally, one of the most remarkable aspects of this project was the architectural element of the structural columns. These columns are designed to transfer a cedar plank design into the columns. These columns called for a high-strength, highly-flowable concrete mix, which would consolidate very quickly because the bug holes or honeycombing would ruin the effect of this beautiful element.

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