The Arizona Department of Transportation (ADOT) maintains about 12,333km (7,400 centerline miles) of highways, of which approximately 500km (300 miles) are Portland Cement Concrete. A twenty year old, 16.7km (ten mile) section of concrete pavement on Interstate 40 near Flagstaff, Arizona suffered severe deterioration warranting reconstruction (Figure 1). Flagstaff is a mountainous area of 2134m (7,000 foot) elevation with an Alpine like climate. High temperatures in the summer are a pleasant 27°C (80°F) with winter time lows of -31°C (-23° F). Overall rainfall is 0.7m (28 inches) per year and winter snows average over 2,500mm (100 inches) per year. Interstate 40 cuts through this mountainous area and is built on soils and rock of generally poor engineering quality. The current traffic is over 20,000 vehicles per day. The traffic loading has rapidly increased over the years and is quite heavy, with presently over 35 percent large trucks.