Evaluation of the steel slag incorporation as coarse aggregate for road construction: technical requirements and environmental impact assessment

Ferreira, Víctor J.; Vilaplana, Aitana Sáez-de-Guinoa; García-Armingol, Tatiana; Aranda‐Usón, Alfonso; Lausín-González, Cristina; López-Sabirón, Ana M.; Ferreira, Germán

doi:10.1016/j.jclepro.2015.08.094

Cited by 136 publications

(53 citation statements)

References 28 publications

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“…Metallurgical industry is one of the world's largest contributors to the anthropogenic CO 2 emissions. Until the last years of 19th century, most of the produced steel derived from the integrated process (blast furnace, BF/basic oxygen furnace, BOF route) used coal as the reducing agent and iron as raw material [1]. Nowadays, in order to reduce energy consumption and bring CO 2 emissions close to zero, a secondary production route using an electric arc furnace (EAF) is becoming far more widespread.…”

Section: Introductionmentioning

confidence: 99%

Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones

et al. 2019

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Steelmaking industries produce a large amount of solid wastes that need to be adequately managed in order to ensure environmental sustainability and reduce the impact of their disposal on earth pollution. Electric arc furnace (EAF) slags are those wastes deriving from secondary steelmaking production; these slags can be re-used and recycled in many industrial applications such as the production of asphalt mixes. In this paper authors investigate the surface performance of EAF slags used as second-hand aggregate in asphalt mixes. In particular, slags behavior under polishing is compared to other types of aggregate commonly used for asphalt concrete such as limestone, basalt, and kinginzite. Several devices (skid tester, laser profilometer, polishing machine) were used to collect experimental data; the analysis of microtexture was carried out by comparing aggregate surface performance before and after polishing. Results show that EAF slags are positively comparable to basalt as concerns the polishing behavior; good correlations between skid resistance and some microtexture indicators are also carried out.

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Section: Introductionmentioning

confidence: 99%

Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones

et al. 2019

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“…Moreover, as calculated by Ferreira et al [118] an environmental benefit of around 10% associated with the use of recycled aggregates can be achieved if slag is used instead of virgin aggregates.…”

Section: Issues Related With Energy Consumption and Emissionsmentioning

confidence: 96%

Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

2018

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The use of recycled aggregates, manufactured from several by-products, to replace virgin aggregates in the production of pavement asphalt mixtures needs to be encouraged. Nevertheless, there are some concerns and uncertainties about the actual environmental, economic and mechanical performance resulting from the incorporation of recycled aggregates in asphalt mixtures. Therefore, this paper has the goal of discussing important features to help decision makers to select recycled aggregates as raw materials for asphalt mixtures. Based on the literature review carried out and the own previous experience of the authors, the article's main findings reveal that incorporating some of the most common recycled aggregates into asphalt mixtures is feasible, even in a life-cycle analysis perspective. Although some specific technical operations are sometimes necessary when using recycled aggregates in asphalt mixtures, some benefits in terms of environmental impacts, energy use and costs are likely to be achieved, as well as in what concerns the mechanical performance of the asphalt mixtures.

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“…Steel slag in road construction has multiple benefits, such as tackling the disposal of waste and reducing environmental impact by acting as a reducing substitute for the non-renewable and natural aggregates [20]. This is effectively achieved by applying slag in the unbound base layer of the pavement structure as it entails the maximum thickness (average thickness of the unbound base layer is 20-45 cm and the asphalt wearing layer is 2-8 cm, for example).…”

Section: Steel Slag As a Construction Materialsmentioning

confidence: 99%

Usage of Steel Slag as a Construction Material and in Environmental Applications

Stjepanović

Hackenberger

et al. 2019

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Steel slag is a by-product in the production of steel. An increase of its production results in more landfills. It is mostly used as a building material in the construction of roads, where it substitutes natural materials. The use of steel slag in road construction has multiple benefits; both by solving the challenges of waste disposal and preserving environmental resources by moderating the consumption of non-renewable and natural aggregates. Apart from being used as a building material, steel slag is also used in numerous environmental applications, such as soil and water remediation and CO2 sequestration. However, a multidisciplinary environmental impact study of steel slag, particularly regarding both the aquatic and terrestrial organisms, is lacking. Steel slag contains traces of potentially harmful elements that endanger these living organisms, including heavy metals released into the environment. A high pH value can also significantly influence their leaching properties, thereby affecting the organisms in the water and soil. Given the widespread utility of steel slag, it is recommended to make a thorough risk assessment associated with the various environmental applications of this material.

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Evaluation of the steel slag incorporation as coarse aggregate for road construction: technical requirements and environmental impact assessment

Cited by 136 publications

References 28 publications

Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones

Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones

Feasibility Assessment of the Use of Recycled Aggregates for Asphalt Mixtures

Usage of Steel Slag as a Construction Material and in Environmental Applications

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