Recent improvements in quality of steel slag aggregate

Steel slag aggregate has been used in premium surface course hot-mix asphalt for Ontario highways since the early 1970s. Asphalt pavement performance problems led to the Ministry of Transportation imposing a moratorium on the use on steel slag aggregate in late 1991. The problem has been addressed from the steelmakers producing the slag to hot-mix design and production. Steel slag can serve as good aggregate for use in hot-mix asphalt if the …