Naslov
Utilization of steel slag as alternative aggregate in road construction

Autori
Sofilić, Tahir ; Ćosić, Mario ; Mladenović, Ana ; Sofilić, Una

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Utilization of steelmaking slags with by-product recovery : proceedings / Karbowniczek, M. - Krakov : Wydawnictwo Naukowe Akapit, 2010, 105-120

ISBN
978-83-60958-8

Skup
Utilization of steelmaking slags with by-product recovery

Mjesto i datum
Kraków, Poljska, 10.05.2010. - 11.05.2010

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
steel slag; waste; aggregates; road construction; asphalt

Sažetak
Even though electric arc furnace steel slag (EAFS) has been classified as non-hazardous waste by its physical and chemical characteristics, and is possible to be disposed at provided disposal sites without danger to the environment, this is rarely applied, because the permanent disposal of steel slag is highly expensive and requires a great area, and the valuable ingredients of steel slag are lost forever. The purpose of this paper was to improve the management of this type of non-hazardous industrial waste. A part of this research examines the possibilities of using EAF slag in other industries, with a special focus on using the slag as substitute for natural mineral aggregates in the production of asphalt mixtures in road construction. EAFS is derived during low carbon steel production in Steel Mill of CMC Sisak, Croatia. After tapping, the molten slag was cooled with water, after which it was subjected to the following procedures: grinding, magnetic separation in order to remove leftover particles of the cooled steel melt, fragmentation and sieving. In this way an average specimen of steel slag was created, as well as specimens of granulometric fractions (0/4mm, 4/8mm, 8/11mm, 8/16mm and 16/32mm). In order to determine the basic characteristics for the purpose of determining suitability of EAFS for usage in the production of asphalt mixtures, it was exposed to the testing of its geometric, physical and mechanical properties, as well as durability were. The results of those tests have been compared to natural aggregates commonly used in the manufacture of asphalt mixtures. Comparison of test results between specimens of EAF slag and natural aggregates used in asphalt mixtures on highways and other top-class traffic load roads has demonstrated that the examined slag has equally good physical and mechanical properties, while it is significantly better in terms of resistance to polishing. Within the framework of this work, test fields have recently been constructed and the existing wearing course was replaced by an AB 11 type of asphalt. The test field was constructed on August 2009 and it is located on county road in SMŽ County, Croatia. All obtained results of the tested geometric, physical and mechanical properties, as well as durability indicate that EAFS asphalt mixtures fulfils the conditions required for aggregates used for bituminous mixtures and surface treatments for roads.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne tehničke znanosti

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