Environmental Impacts of Mixed Aggregates for use in Unbound Layers in Road Construction
Autor: | Predrag Šinik, Janez Ščančar, Metka Gostečnik, Ana Mladenovič, Radmila Milačič |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
natural aggregate
unbound materials for road construction QE1-996.5 Mining engineering. Metallurgy Road construction mixed aggregates 0211 other engineering and technologies TN1-997 naravni agregat Geology 02 engineering and technology environmental impacts mešani agregati 010501 environmental sciences okoljski vplivi 01 natural sciences Civil engineering electric arc furnace slag nevezani materiali v cestogradnji žlindra iz elektroobločne peči 021105 building & construction 0105 earth and related environmental sciences |
Zdroj: | Materials and Geoenvironment, Vol 67, Iss 1, Pp 3-11 (2020) |
ISSN: | 1854-7400 |
Popis: | 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 grain size 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. |
Databáze: | OpenAIRE |
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