20.500.12556/DiRROS-16845 Environmental impacts of mixed aggregates for use in unbound layers in road construction Okoljski vplivi mešanih agregatov za uporabo v nevezanih materialih v cestogradnji During carbon steel manufacturing, large amounts of electric arc furnace (EAF) slag are generated. EAF slag, if properly treated and processed into aggregate, is an alternative source of high-quality material, which can substitute the use of natural aggregates in most demanding applications in the construction sector, mostly for wearing asphalt courses. In this screening process of high-quality aggregates, a side material with grainsize 0/32 mm is also produced, which can be used as an aggregate for unbound layers in road construction. In this study, the environmental impacts of slag aggregate (fraction 0/32 mm) were evaluated in mixed natural/slag aggregates. Different mixtures of natural/slag aggregates were prepared from aged (28 days) and fresh slag, and their environmental impacts were evaluated using leaching tests. It was shown that among the elements, chromium (Cr) was leached from some mixed aggregates in quantities that exceeded the criterion for inert waste. The data from the present investigation revealed that mixed aggregates, prepared from aged slag (fraction 0/32 mm) and natural stone in the ratio 10/90, are environmentally acceptable and can be safely used in unbound materials for road construction. Med proizvodnjo ogljičnega jekla v elektroobločnih pečeh nastajajo velike količine žlindre. Pravilno obdelana in predelana žlindra je odličen material, ki lahko uspešno nadomesti naravne agregate. Pred uporabo se žlindra stara, drobi in separira v agregate različnih frakcij,ki se uporabljajo v gradbeništvu, predvsem kot visoko-kakovosten agregat v obrabnih asfaltnih plasteh. Med separiranjem nastaja tudi agregat zrnavosti 0/32 mm,ki ni primeren za uporabo v asfaltnih plasteh, temveč se uporablja za nevezane nosilne plasti v cestogradnji. V našem delu smo preučili okoljske vplive mešanega agregata (frakcija 0/32 mm) žlindre in naravnega agregata za njegovo uporabo v nevezanih materialih v cestogradnji. Pripravili smo različne mešanice iz naravne-ga agregata in agregata iz žlindre. Uporabili smo svežo in starano (28 dni) žlindro ter ocenili okoljske vplive pripravljenih mešanic z izlužitvenimi testi. Rezultati naše raziskave so pokazali, da se iz nekaterih pripravljenih mešanic lahko izlužuje element krom (Cr) v količinah, ki presegajo mejno vrednost za inertne odpadke. Kot nevezane materiale v cestogradnji varno lahko uporabimo agregate, ki smo jih pripravili iz agregata izstarane žlindre (frakcija 0–32 mm) in naravnega agregata v razmerju med 10/90. žlindra iz elektroobločne peči naravni agregat mešani agregati koljski vplivi nevezani materiali v cestogradnji true false true Naravoslovnotehniška fakulteta, Inštitut za rudarstvo, geotehnologijo in okolje Angleški jezik Slovenski jezik © 2020 Metka Gostečnik et al., published by Sciendo Neznano 2023-08-28 08:34:13 2023-08-30 09:28:12 2023-08-31 03:35:46 0000-00-00 00:00:00 2020 0 0 Besedilo v slov.; str. 3-11 no. 1 Vol. 67 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2020-05-18 502/504 1408-7073 10.2478/rmzmag-2020-0002 16687107 RAZ_Gostecnik_Metka_2020.pdf RAZ_Gostecnik_Metka_2020.pdf 1 6C672EAC2B4A96BF86B5CD963ACF88A6 bb1996cb3b880164693a4aea5065950e5f1bb61c851f9466b86138c8f1913f48 a48d298d-455d-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22900 https://doi.org/10.2478/rmzmag-2020-0002 0 9a17cf07-455d-11ee-8cc8-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=22899 Zavod za gradbeništvo Slovenije 0 0 0