The Oregon Department of Transportation, working with Knife River Corporation, Hamilton Construction, Slayden Construction, and OBEC Engineering, won a national award from the national Slag Cement Association in the High Performance category for the new Interstate-5 bridge over the Willamette River in Springfield, Oregon. Recognized alongside the new One World Trade Center tower in New York City, which tied for the award, the new bridge used a 60% slag concrete mix, previously never used by ODOT. This slag concrete is strong, with a compressive strength of 6,200 psi, much greater than the required strength of 4,500 psi requested in project specifications. Knife River Corporation provided 35,000 cubic yards of the slag concrete in the form of 12 different mix designs.
