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April 28, 2016

Concrete paving

Photo courtesy of WACA
The taxiway project was completed five days early.

Spokane International Airport taxiway reconfiguration

Location: Spokane

Owner/developer: Spokane International Airport

Team: Acme Concrete Paving, general and concrete contractor; Century West Engineering Corp., architect; Taylor Engineering, structural engineer; Central Pre-Mix Concrete Co. (doing business as Oldcastle Materials), ready-mix supplier

Spokane International Airport undertook a project to reconfigure its taxiways after identifying deficiencies during its master planning process.

The new taxiways were designed to meet current Federal Aviation Administration standards, and provide better access to the cargo and passenger terminal aircraft parking aprons and other facilities from Runway 3-21.

The project was completed in two phases, which were to be completed in 116 calendar days in 2015.

The first phase involved the removal of taxiways B, D, F and the unused existing portion of Taxiway G. Phase 1 also included excavation and installation of the new taxiways A5, G2 and G3, up to the runway safety area of 3-21.

The project had challenges on multiple fronts. Over-excavation was required to eliminate unsuitable soils and undocumented fill found during the excavation process.

Because over-excavation was not anticipated, the schedule was negatively affected. Still, Phase 1 was completed early due to good communication and coordination among the contractors, inspectors and engineers.

Phase 2 involved the closing of Runway 3-21 initially, and Runway 7-25 upon completion of the work at 3-21. Demolition of the existing taxiways inside the 3-21 safety areas was completed quickly, allowing excavation to progress rapidly.

All concrete surfaces were placed using the latest in Leica wireless technology by a slipform paver. This project had complex cross- and long-slope transitions that were progressed and completed within specification. Concrete depths varied from 15.5 inches to 16 inches and 18 inches in thickened areas.

Each new taxiway that was placed was done in phases, creating opportunities for imperfect transitions at each phase end. No such imperfections occurred, and the smoothness of the concrete surface as well as the asphalt surfaces was of the highest quality.

The delivered concrete maintained correct slump and air entrainment. Also, the aggregates were of such quality that little to no deleterious materials were found at the surface.

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