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Steel slag is a residue produced by refining iron to steel in open-hearth, basic oxygen and electric arc furnaces. It is liquid cooled from its molten state and has high density. The possibilities for the recycling of steel slag differ from country to country, depending on the chemical composition of the slags, steel making process, the national and local environmental regulations. Was first, normal to recycle 30% of the steel slag production internally in the steel works to the sinter and BOF plants. Nowadays, recycling slag by means of the sinter plant has declined because of the higher quality demands on steel production. Steel slags have several applications in the foreign countries. These are as a sub-base material for road construction, civil and marine engineering and agricultural use. Steel slag from a Turkish company has been used in asphaltic mixtures as an aggregate in this research. Steel slag was used in three levels of asphalt pavement as a bitumen base, binder and wearing layer. Physical properties of steel slag satisfied the requirements for using in asphaltic mixture.

Steel slag is a waste material produced during the process of steel making. For many years, a large amount of steel slag has been deposited in slag storing yards, occupied farmland, silted rivers and polluted the environment. Many steel plants in the world have already taken up innovative waste recycling technologies with the ultimate objective of 100% recycling. The comprehensive utilization of steel slag is important for environmental protection and resource reuse in Turkey and abroad. It is clear that steel slag must meet appropriate performance specifications before being adopted for a particular application. The aim of the present research was to characterize steel slag from a Turkish company and compare to the steel slags from various countries. Application possibilities have been sought by comparing properties to the other steel slags.