Minnesota used recycled asphalt that contained 50% reclaimed asphalt pavement (RAP) to reconstruct a four-lane urban highway in 1976, and engineers examined pavement cores and visually inspected the road fifteen years later, before a planned milling and overlay project. The project was built in Maplewood, Minnesota, and was among the early US efforts that tested whether old road material could be reused in new pavement without compromising its performance.
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