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Construction of the Hoover Dam Bypass

2011; American Concrete Institute; Volume: 33; Issue: 2 Linguagem: Inglês

1944-7388

Jeff St. John,

Transportation Safety and Impact Analysis

Since completion in the 1930s, the roadway on top of the Hoover Dam has been a primary traffic route across the Colorado River. Increasing traffic and tourism often led to lengthy delays. Traffic volumes increased even more when U.S. 93 became a North American Free Trade Agreement corridor in the 1990s. Security concerns in the wake of the 9/11 attacks caused truck traffic to be banned from using the crossing. All of these factors motivated the design and construction of the Hoover Dam Bypass with its centerpiece river crossing, the Mike O'Callaghan-Pat Tillman Memorial Bridge. This article looks at issues relating to the construction of the structure's concrete arches, including the mixture proportion, thermal control, delivery and placement, consolidation, and quality control of the concrete.