Reuse of steel slag in bituminous paving mixtures

Sorlini, Sabrina; Sanzeni, Alex; Rondi, Luca

doi:10.1016/j.jhazmat.2011.12.066

Cited by 164 publications

(61 citation statements)

References 11 publications

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“…In Taiwan, steelmaking slag research has been done in the following fields: (a) cement industry, (b) road construction, (c) glass making, (d) concrete or asphalt aggregate, (e) ceramic tiles, (f) agriculture, soil conditioner, (g) aquaculture, and (h) land amendments (CSC Group, 2003). Some research has already been done on the use of steelmaking slags in construction material, e.g., as alkaline fillers in the papermaking industry and asphalt concrete applications (Lim et al, 2010), in bricks and tiles (El-Mahllawy, 2008), as aggregate for the production of bituminous paving mixtures (Sorlini et al, 2012), and in cement-based materials as cement/sand replacements or binder known as "alkaline cements" (Fernández-Jimenez et al, 2006;Lim et al, 2010;Zhang et al, 2011).…”

Section: Performance Evaluationmentioning

confidence: 99%

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

Pan

Chang

Chiang

2012

Aerosol Air Qual. Res.

358

193

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CO 2 capture, utilization, and storage (CCUS) is a promising technology wherein CO 2 is captured and stored in solid form for further utilization instead of being released into the atmosphere in high concentrations. Under this framework, a new process called accelerated carbonation has been widely researched and developed. In this process, alkaline materials are reacted with high-purity CO 2 in the presence of moisture to accelerate the reaction to a timescale of a few minutes or hours. The feedstock for accelerated carbonation includes natural silicate-minerals (e.g., wollastonite, serpentine, and olivine) and industrial residues (e.g., steelmaking slag, municipal solid waste incinerator (MSWI) ash, and air pollution control (APC) residues). This research article focuses on carbonation technologies that use industrial alkaline wastes, such as steelmaking slags and metalworking wastewater. The carbonation of alkaline solid waste has been shown to be an effective way to capture CO 2 and to eliminate the contents of Ca(OH) 2 in solid residues, thus improving the durability of concrete blended with the carbonated residues. However, the operating conditions must be further studied for both the economic viability of the technology and the optimal conditions for CO 2 reaction.

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Section: Performance Evaluationmentioning

confidence: 99%

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

Pan

Chang

Chiang

2012

Aerosol Air Qual. Res.

358

193

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“…Ahmedzade e Sengoz [4] avaliaram o desempenho da escória de aciaria como agregado graúdo em misturas asfálticas e também indicaram valores superiores ao agregado convencional analisado. Sorlini et al [33] investigaram o potencial de utilização da escória de aciaria em mistura asfáltica com foco no processo de expansão do material, quanto ao comportamento mecânico as misturas asfálticas contendo escória apresentaram resultados semelhantes aos agregados naturais, porém, observaram que um tempo de cura de 2-3 meses deveria ser respeitado.…”

Section: Introductionunclassified

Estudo do processo de lixiviação controlada da escória de aciaria em extrator soxhlet visando emprego em pavimentos

et al. 2017

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RESUMOEste trabalho aborda a caracterização das propriedades físicas, químicas e mecânicas da escória de aciaria para emprego como agregado antes e após ensaio de lixiviação controlada em extrator Soxhlet. O material foi caracterizado antes de passar por processo de estabilização (escória virgem) e após lixiviação controlada em períodos distintos de 24, 56, 96, 120 horas. A escória foi submetida, em laboratório, a uma simulação de precipitação em equipamento Soxhlet visando avaliar suas propriedades físicas, químicas e mecânicas após cada período. O estudo do processo de lixiviação em escória de aciaria buscou compreender a influência do processo de lavagem no comportamento da escória. A caracterização física se deu por meio dos ensaios tradicionais de agregados graúdos, a caracterização química através dos ensaios de Microscopia Eletrônica por Varredura (MEV) completada pela análise de Espectroscopia de Energia Dispersiva (EDS) e Difração de Raio-X, a caracterização mecânica por meio de ensaios de expansão normatizado e adaptado. A amostra virgem, sem receber processo de estabilização por lixiviação controlada, apresentou resultados satisfatórios na caracterização física quando comparada a agregados convencionais, a caracterização química comprovou ser uma escória de aciaria com elevados teores de CaO, MgO e FeO, enquanto a caracterização mecânica demonstrou que, apesar do grau de expansibilidade da escória ser baixo pelos padrões atuais, este não deve ser desconsiderado em obras para pavimentação. Após lixiviação controlada a escória não apresentou perda significativa de suas propriedades físicas. Quanto aos ensaios mecânicos de expansão houve redução no potencial de expansibilidade após os períodos de lixiviação. Conclui-se que o processo de lixiviação em extrator Soxhlet é de importância no estudo das propriedades da escória de aciaria, uma vez que contemplando vários dias de lixiviação houve redução do potencial de expansão, característica limitante no uso da escória de aciaria em pavimentação.Palavras chaves: Escória de aciaria, caracterização, pavimentação. ABSTRACTThis work addresses the characterization of physical, chemical and mechanical properties of steel slag as an alternative aggregation before and after leaching testing controlled Soxhlet extractor. The material it was characterized before going through the natural leaching process and after controlled leaching in different periods of 24, 56, 96, 120 hours. The steel slag was subjected in the laboratory to simulate the precipitation in Soxhlet equipment to evaluate its physical, chemical and mechanical properties after each period described. The study of the process of leaching in steel slag searched to understand the influence of the washing process in a slag behavior in such a process. The physical characterization occurred through traditional testing of coarse aggregates, the chemical characterization through the testing of Scanning Eletron Microscopy (SEM) completed by Dispersive Spectroscopy Energy (DSE) and X-ray diffraction and the mechani...

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“…Considered as waste for a long time, this by-product is increasingly used in civil engineering applications as its valorization allows a number of benefits such as the conservation of natural resources, the reduction of waste storage volumes, the decrease of material construction cost and transport demands and the promotion of local economy [2][3][4]. Today, EAF slag is partially recycled as aggregates for earthworks [5,6], for asphalt mixtures [7,8], for mortar and concrete [9,10] and for clinker manufacture [6]. But, recycling this by-product in such applications depends not only on its aptitude to reach technical specifications but also on its environmental compatibility including the leachability of harmuful elements like chromium, molybdenum and vanadium [4,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Efficiency assessment of EAF-S processing for recycling purpose by LCA method

2016

IJRCMCE

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Abstract-EAF slag is a by-product generated by steel production in an electric arc furnace (EAF). Generally, this by-product is not or less recycled in a next steel production and stored in the form of a dump (which takes increasingly space), because of the presence of significant amounts of impurities. Many studies have shown that slag may substitute for natural aggregate in the construction sector. But, because of the presence of heavy metals, EAF slag must be processed for the production of recyclable material regarding environmental recommendation for road construction. This paper presents the study of the environmental efficiency assessment of EAF slag processing for recycling using life cycle assessment (LCA). Two processes are compared. The efficiency assessment of the processes is based on the environmental "quality" of the produced material as well as on the environmental impact of the process. Thus technical characterization of the EAF slag was performed to verify its environmental "quality" based on its conformity to French standards and rules for use as road material. So, leaching tests were done, as the main property considered for recycling waste materials, in France, is their potential emission of pollutants to water. All collected experimental data are then used in order to compare the various impacts obtained for each process and discuss the interest of various solutions considering both toxicity and ecotoxicity indicators.

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Reuse of steel slag in bituminous paving mixtures

Cited by 164 publications

References 11 publications

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

CO2 Capture by Accelerated Carbonation of Alkaline Wastes: A Review on Its Principles and Applications

Estudo do processo de lixiviação controlada da escória de aciaria em extrator soxhlet visando emprego em pavimentos

Efficiency assessment of EAF-S processing for recycling purpose by LCA method

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