Nominee
Catalina Pacific Concrete, Largo Concrete, Walter P Moore: Intuit Dome Project
Category
Innovative Project
Description
Catalina Pacific Concrete, a CalPortland Company, worked in conjunction with Largo Concrete and Walter P Moore's design team to develop new innovative mix designs with the lowest possible environmental impacts possible. The utilization of CalPortland's ASTM C595 Advancement IL(HS) cement, Orca aggregates, and tight quality control led to the reduction of GWP beyond what Walter P Moore initially forecasted for most of the structural elements. In situations where the unit weight became an issue, with the heavier weight on the Orca Aggregates, new aggregate blends were developed using local and Orca aggregates in order to achieve the desired structural strength and shrinkage characteristics, while still maintaining low emissions on the project.
Evidence
Utilizing the design matrix developed by Walter P Moore (Dirk Kestner, Margaux Burkholder, and Ryan Anderson) and working alongside Largo Concrete (Bob Stephens, Drake Robinson, and Harrison Woods), Catalina Pacific developed a new catalog of mix designs with the lowest possible emissions, with the primary focus on Global Warming Potential (GWP). Dozens of laboratory trial batches were performed to develop mix designs that were as optimal as possible with total cementitious content, fly ash replacement, aggregate blends, and workability characteristics. Field Trials were performed with the addition of Carbon Mineralization technologies as well to determine whether the mixes could be further optimized. In the case of this project utilizing highly optimized mixes with IL(HS) cement, Orca aggregates, and fly ash replacement, there was no benefit to the use of Induced Carbon Mineralization. The technical and design teams of all parties involved worked tirelessly through the mix design development phase and well into the construction phase to ensure that every mix design for all structural and non-structural elements was optimized for placement and for the lowest possible embodied carbon with the regionally available materials. All of the parties involved presented their findings with the project development phase at a joint SEAOSC and ACI SoCal Chapter event in 2022.
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