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1601 Wewatta

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Colorado, USA
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Vertical / High-Rise
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22 months
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10 Story - 280,000 sq. ft.
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Jirsa Hedrick
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Concrete Frame Associates
1601 Wewatta is a 280,000 sq. ft. office building for Denver's Union Station district. The 10-story project is located at the corner of 16th and Wewatta in the Denver metro area's hottest real estate market: Downtown Denver's Union Station district.
In addition to its primary office use, 1601 Wewatta also features 17,000 sq. ft. of retail space on the ground floor. The project includes 435 parking spaces on four levels of underground parking. The project broke ground in July 2013 and was completed in May 2015.
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Project Challenges

This project had some unique challenges in the specification of some of the concrete mixes for the project - some very low w/c ratio and high strength mixes were required for the project. Several of these mixes also called for them to carry some or all of the additional admixtures, like shrinkage reducers, corrosion inhibitors, and macro fibres. These kinds of mixes naturally pose a problem for any project, but for 1601 Wewatta, they added one more level of complexity to the situation.
The pumping configuration was complicated as well. After leaving the hopper, concrete started with a 40' drop, then a 200' run of pipe, then a 15' rise, and 40' more pipe to reach the placing boom. Then the climb to whichever floor we were working on, across the placing boom and down the tip hose to its placement spot.

Project Solutions

BURNCO worked with Concrete Frame Associates, the pump company, and the finisher to set up a series of test pours. During these 4 test pours, Brundage Bone brought and laid out over 200 ft of steel line at our Henderson plant.
Using BURNCO's technical knowledge of concrete, in collaboration with the project team, we went to work on designing the required mixes for the project. We were able to customize the mixes for this project to find a balance between a mix which would meet the specifications, be finishable, and allow the pump to deliver the mud over the long windy configuration at an acceptable rate that wouldn't burn out the pump's motor. We also used some admixtures to increase the pumpability of the mixes.

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