Phoenix Crime Lab Parking Structure Phoenix, Arizona Architect Durrant Construction Manager Gilbane Engineer KPFF Consulting Concrete Precast/ Prestress Producer Coreslab Structures, Phx. The underground parking structure for Phoenix Crime Lab had a unique design challenge. The top level was designed to be a street level plaza that would include a xeriscaped garden, trees and planter boxes. This environmentally sound design reduces urban heat islands while adding aesthetic appeal to Phoenix's bustling downtown community. Self-consolidating light weight concrete with Utelite Expanded Shale Aggregates was used in the production of prestress double tees to accommodate the large amount of structural steel needed to address the project's load requirements. PROJECT REQUIREMENTS       1. Initial concrete stripping strength ― 5200 psi/16 hours       2. Design F'c strength ― 7000 psi/28 days       3. Design equilibrium density ― 118 lb/ft³       4. Plastic concrete spread range of 26 - 28â€�   Home | Products | Contact Info | About Us | Ready Mix | Precast | Masonry | Roof Tile Horticulture | Filter Media | Gradings | Specifying | Other Uses