engleski

Utilization of steel slag as alternative aggregate in asphalt wearing cours

Although metallurgical slag is still today considered waste and is categorized in industrial waste catalogues in most countries in the world, it is most definitely not waste, neither by its physical and chemical properties not according to data on its use as valuable material for different purposes. This paper demonstrates the possibilities of using steel slag as one small part of industrial waste arising from the processes of steel production. Considering the specificity of physical and chemical properties of steel slag and a series of possibilities for their use in construction industry, this paper pays special attention to road construction. At the same time, this work demonstrates the results of testing basic physical and chemical properties of steel slag generated in the steel mill of CMC Sisak d.o.o., Croatia, with the purpose of its characterization as the type of waste, i.e. by-product intended for recycling in other industries. Special attention has been directed at investigating the possibilities of it being used as substitute for natural mineral aggregates when producing asphalt mixtures. The results which were obtained by testing geometric, physical-mechanical properties, as well as the properties of duration on the specimen of electric arc furnace steel slag, have satisfied the conditions for manufacturing mixtures of the tested steel slag and natural aggregate which can be used in asphalt production. Within the framework of this work, test fields have recently been constructed and the existing wearing course was replaced by an AC 11 type of asphalt. By means of laboratory analyses and in situ monitoring it should be possible to prove that asphalt composites containing steel slag have sufficient durability, and can achieve and maintain the required surface characteristics for road traffic safety.

steel slag; mineral aggregate; road construction; asphalt

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