Meeting the global demand for concrete in the future is becoming more challenging with each passing year. Since more than three quarters of the volume of concrete is commonly composed of aggregates and the realization that the EarthÆs resources are finite, finding suitable alternatives to natural aggregates is becoming increasingly important. This research was undertaken to explore the feasibility of utilizing the steel slag produced by steel mills in the Northeastern Ohio region as a replacement for natural aggregate in the Ohio Department of Transportation (ODOT) Class C concrete pavement mixture. Steel slag is a by-product of steel making produced during the separation of the molten steel from impurities in steel-making furnaces. Although worldwide production numbers of steel slag is unavailable,it is estimated that 130 to 200 million tons of steel slag was produced in 2007. The primary aim of this research was to examine the effects of rapid freezing and thawing on concrete specimens since any concrete pavementutilized in the region is subjected to these harsh effects. Length changeof the hardened concrete was also examined as well as the compressive, flexural, and splitting tensile strengths of the various replacement mixtures.
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