Designing for the Famous Bay Bridge S-Curve 2005-2008
A key challenge presented to Central Concrete was how to design a concrete mix for the famous Bay Bridge S-curve—a temporary structure, connecting the older eastern span of the Bay Bridge to Yerba Buena Island that acted as a detour while teams built a new bridge structure. Working with general contractor C.C. Myers, Inc. and subcontractor Conco, Central Concrete designed a concrete mix that could: (1) be pumped across an extraordinary distance of 2000 feet including 300 feet vertically; (2) achieve very high strength properties; and (3) be easily supported by the steel superstructure.
Central Concrete worked with BASF, the leader in developing chemical admixtures for concrete, to design solutions to meet these aggressive requirements. Through leading-edge chemistry and material science expertise, Central and BASF engineered a highly flowable, lightweight concrete that achieved the required compressive strength and other durability requirements.
The concrete mixes for this application, along with the other mixes for the Bay Bridge, underwent extensive testing in Central Concrete's Lab and then verified by San Jose State University's Civil Engineering department.
"Central Concrete's performance on this complex project was exceptional", said Bob Coupe, project manager for C. C. Myers, Inc. "Their technical and operational capabilities coupled with their dedication to project safety contributed greatly to the success of the project. They were an integral part of the team."
Final Deck Section Placed, March 2013
The final deck of the San Francisco-Oakland Bay Bridge's East span was placed on March 9, 2013, creating the finishing section of the Bay Bridge's cast-in-place concrete roadway decks.
Beginning at 7:00 a.m. on March 9th, 136 Central Concrete trucks began delivering 1,266 cubic yards for the Oakland Touchdown eastbound roadway. The 1,079-foot section—an area equal to about two city blocks—was placed and finished within nine hours. The completion of the East Span ensured that the westbound and eastbound lanes of the new bridge would open to traffic simultaneously, a key milestone set for the 2013 Labor Day Opening. To learn more about the March 9, 2013 placement, go to: ABC KGO Video
Central Concrete would like to acknowledge these outstanding partners that made this massive undertaking possible:
- American Bridge/Fluor JV:
- BASF, www.basf-admixtures.com
- California Department of Transportation, baybridgeinfo.org
- San Jose State University Civil Engineering Department
- General Contractors:
About Central Concrete
Central Concrete Supply Co., Inc., a business unit of U.S. Concrete, Inc. (NASDAQ-USCR), has been serving the San Francisco Bay Area for more than 60 years. The company is recognized for engineering higher-performing concrete than traditional concrete, while significantly lowering carbon footprints with its low-C02 mixes.
Unlike traditional concrete, Central's standard mixes deliver 50% or greater cement replacement materials, thereby significantly reducing the carbon footprint of the project under construction. Central Concrete is recognized for supplying its low-CO2 mixes to numerous San Francisco Bay Area signature projects, including the Cathedral of Christ the Light Church, Oakland; California Academy of Sciences, San Francisco – the world's greenest museum; NASA Ames Sustainability Base, Mountain View – the greenest federal building in the U.S.; David and Lucile Packard Foundation, Los Altos – largest net-zero private office building in Calif.; the San Francisco Public Utilities Commission (SFPUC) headquarters – San Francisco's greenest office building; and the new Santa Clara 49er Stadium.
With 12 locations in the San Francisco Bay Area, Central Concrete offers multiple points of service to meet the diverse operational needs of its customers. For more information, visit www.centralconcrete.com.