1000 Virginia Street Tower, Seattle, WA

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Signature Tower Features Low-Carbon Portland Limestone Cement Highly regarded for quality and innovative structural engineering, Cary Kopczynski & Company (CKC) has combined CO2 savings in a striking concrete-frame tower that featured cutting edge design. This 45-story tower with 6 levels of subterranean parking utilizes Portland Limestone Cement (Type IL). This simple change to the cement specifications allows this project to realize a savings of 450 tons of CO2. CKC used non-linear analysis and Performance Based Design to develop a seismic system that leads to a faster construction at a lower cost. The cast-in-place structure includes 15,000 psi concrete columns and post-tensioned floor slabs to maximize unit space and layout flexibility. The tower share helps reduce wind loads and wind drift.

“CKC is committed to helping the concrete industry reach net zero carbon emissions. A valuable tool in that effort is Type IL Portland-Limestone Cement, which is being successfully used for all 1000 Virginia mixes including foundations, shear walls, columns, and slabs. Going forward, we expect to be specifying Type IL cement for many more projects.” Cary Kopczynski PE, SE, FACI, FPTI Cary Kopczynski & Company, Bellevue, Washington

Project: 1000 Virginia Street: mixed use with parking, retail, and residential Architect: Weber Thompson Structural Engineer: Cary Kopczynski & Company Developer: Holland Partner Group Completion: June 2023

Contributing to industry net zero emissions goals begins with design decisions just like these.