State Highway 45 SE is a 7.5-mile toll road connecting the SH 130 toll road with IH 35 in south Austin. The project included the construction of 23 bridges including water crossings, under pass and overpass structures and elevated direct connectors. The work also included reconstruction of approximately 2.5 miles of the IH-35 main lanes and frontage roads to accommodate the new interchange. The IH 35 work was phased to maintain the current number of travel lanes and to minimize lane closures during peak traffic periods.
As part of a joint venture, Balfour Beatty served as the general contractor for the SH 45 project. The company self-performed approximately 52 percent of the work, including concrete pavement, bridges, retaining walls, and Maintenance of Traffic.
The main lane pavement section consisted of 321,260-sy of 13-inch Continuously Reinforced Concrete Pavement (CRCP) atop four inches of asphalt-stabilized base. Bridges consisted of 845,607-sf of bridge deck atop plate girders and AASHTO concrete beams, including structures over the active IH 35 freeway. Direct Connector Bridges included 17 post tensioned straddle or cantilever bent caps. Balfour Beatty also self-performed the construction of 206,283-sf of Mechanically Stabilized Earth (MSE) and cast-in-place retaining walls.
More than 2.5 million-cy of excavation and embankment was performed as well as the placement of 167,000-tons of asphalt.
The scope of work involved the relocation of dry utilities that required significant coordination between Balfour Beatty and four utility companies for construction of fiber optic lines in a common utility trench. Balfour Beatty coordinated with Texas Department of Transportation’s system integrator to facilitate the placement of toll gantries at four locations on the project.