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CEMEX provides specialty concrete for the most modern tunnel in the San Francisco Bay Area

Date published: July 16, 2013

CEMEX is providing value-added building solutions, including over 50,000 m³ of specialty ready-mix concrete, for the fourth bore of the Caldecott tunnel, which connects Oakland, California to Orinda. The addition is expected to significantly alleviate traffic delays for thousands of daily commuters. Excavation and construction work began in 2010 and the tunnel is expected to open for traffic in late 2013.

CEMEX provides specialty concrete for the Caldecott tunnel

“CEMEX is proud to work with local and federal governments to help enhance the country’s infrastructure,” said CEMEX USA President Karl H. Watson, Jr. “As the US construction sector continues to recover, we look forward to keep being the provider of choice for major infrastructure projects around the country.”

The fourth bore requires excavation dimensions 15 meters wide and 12.3 meters high, have roadway clearance of 5.1 meters in height, and concrete roadway paving 735 millimeters thick. The project is being executed using a Sequential Excavation Method, which requires CEMEX to supply a specialty concrete known as shotcrete which is applied using a construction technique in which the material is conveyed through a hose and pumped pneumatically on a surface at a very high speed. This allows it to be used on any type or shape of surface, including vertical and overhead areas. CEMEX is providing a tailor-made shotcrete mix with very low shrinkage specially formulated to work with the special machinery used to pump it long distances into the tunnel.

Upon its completion, the fourth bore will function as the nerve center for the four Caldecott Tunnels. Among the features of the fourth bore is a fire prevention and response system with a linear heat detector, carbon monoxide and nitrogen oxide detectors, and evacuation passages. Additionally, the bore is designated as a regional lifeline structure, and is designed to reopen to emergency traffic within 72 hours of a major earthquake and will be equipped with Strong Seismic Monitors to gather information that will be sent to the California Geological Survey to help predict future earthquakes. The state-of-the-art center will be operated and managed around the clock by a staff of specially trained operators.

CEMEX has gone the extra mile for this project by providing 24-hour service for several months. The company has also been able to meet a peculiar challenge of this project. In order to transport the material inside the tunnel, the ready-mix trucks had to be driven, in reverse, 3,000 feet on a narrow one-lane road. CEMEX’s experienced drivers have been able to do this safely hundreds of times throughout the project.

CEMEX provides specialty concrete for the Caldecott tunnel

CEMEX is a global building materials company that provides high-quality products and reliable services to customers and communities in more than 50 countries. CEMEX has a rich history of improving the well-being of those it serves through innovative building solutions, efficiency advancements, and efforts to promote a sustainable future.

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