Steel Slag and Recycled Concrete Aggregates: Replacing Quarries to Supply Sustainable Materials for the Asphalt Paving Industry

Loureiro, Carlos D. A.; Moura, Caroline F. N.; Rodrigues, Mafalda; Martinho, Fernando J. B.; Silva, Hugo Manuel Ribeiro Dias da; Oliveira, Joel

doi:10.3390/su14095022

Cited by 29 publications

(11 citation statements)

References 155 publications

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“…Reusing steel helps conserve natural resources and reduces associated extraction and manufacturing costs by reducing the reliance on virgin materials. This, in turn, contributes to the overall economic efficiency of road construction projects [56].…”

Section: The Economic and Environmental Impact Of Reused Steel In Roa...mentioning

confidence: 99%

Utilisation of Reused Steel and Slag: Analysing the Circular Economy Benefits through Three Case Studies

Cervantes Puma,

Salles,

Turk

et al. 2024

Buildings

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This research explores sustainable construction practices focusing on material reuse, specifically reclaimed structural steel and slag. In general, the building stock is not designed for deconstruction, and material recovery for reuse at the end of life of buildings is complex and challenging. The study evaluates the benefits of content reuse through a thorough analysis of three case studies—BedZED eco-friendly housing, Angus Technopôle building, and the use of steel slag aggregate in road construction. It highlights the value of reclaimed structural steel and by-products like steel slag in waste reduction, energy conservation, and resource preservation. The BedZED case study showcases recycled steel’s cost-effectiveness and economic viability in construction, while the Angus Technopôle building exemplifies the adaptive reuse of an old steel frame building. Additionally, the third case study showcases the benefits of using Electric Arc Furnace C slag in asphalt-wearing courses, highlighting the reduction in greenhouse gas emissions and environmental impact. The versatility of reclaimed structural steel and slag is evident in integrating material reuse in building construction and road infrastructure. These case studies illustrate the potential for reusing steel and its by-products in various construction contexts, from eco-friendly housing to road development. Therefore, the study aims to demonstrate the feasibility and benefits of sustainable practices within the construction industry by showcasing the successful incorporation of reclaimed steel and slag in these projects. Considering the significant contributions of building construction to global greenhouse gas emissions, raw material extraction, and waste production, the study advocates for adopting circular economy (CE) principles within the construction industry. Finally, the analysis of case studies underscores the advantages of reclaimed structural steel and the valorisation of steel slag through the lens of CE and their contribution to sustainable development.

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Section: The Economic and Environmental Impact Of Reused Steel In Roa...mentioning

confidence: 99%

Utilisation of Reused Steel and Slag: Analysing the Circular Economy Benefits through Three Case Studies

Cervantes Puma,

Salles,

Turk

et al. 2024

Buildings

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“…In a review paper [8], the authors concluded that several properties of steel slag aggregates (e.g., roughness, shape, angularity, hardness, polishing resistance, and wear resistance) make them suitable for use in asphalt mixtures. In brief, the SSAs have a low presence of fines, a high sand equivalent, a good shape with high angularity, rough texture, a high density (3.2-3.8 g/cm 3 ), and high porosity and water absorption [9].…”

Section: Literature Reviewmentioning

confidence: 99%

The Effect of Microwave Radiation on the Self-Healing Performance of Asphalt Mixtures with Steel Slag Aggregates and Steel Fibers

et al. 2023

Self Cite

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Self-healing in asphalt mixtures is a property that can be enhanced by external heating, which causes a thermal expansion that increases the flow of bitumen with reduced viscosity through the cracks. Therefore, this study aims to evaluate the effects of microwave heating on the self-healing performance of three asphalt mixtures: (1) conventional, (2) with steel wool fibers (SWF), and (3) with steel slag aggregates (SSA) and SWF. After evaluating the microwave heating capacity of the three asphalt mixtures with a thermographic camera, their self-healing performance was determined with fracture or fatigue tests and microwave heating recovery cycles. The results demonstrated that the mixtures with SSA and SWF promoted higher heating temperatures and presented the best self-healing capacity during the semicircular bending test and heating cycles, with significant strength recovery after a total fracture. In contrast, the mixtures without SSA presented inferior fracture results. Both the conventional mixture and that containing SSA and SWF presented high healing indexes after the four-point bending fatigue test and heating cycles, with a fatigue life recovery of around 150% after applying two healing cycles. Therefore, the conclusion is that SSA greatly influences the self-healing performance of asphalt mixtures after microwave radiation heating.

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“…Addressing quarry waste disposal is crucial to the ecological restoration of quarry areas 8,9 . Quarry waste serves as a raw material in the production of concrete and ceramic tiles, and as a construction material for highways 10 . However, most research primarily concentrates on ne particles smaller than 4-5 mm, with limited studies addressing coarsegrained slag 11,12 .This coarse slag possesses a loose structure, with particles typically in point contact.…”

Section: Introductionmentioning

confidence: 99%

Effects of different water and fertilizer treatments on the matrix properties and plant growth of tailings waste

Li,

Yang,

et al. 2024

Preprint

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Phytoremediation is widely regarded as the most environmentally sustainable green technology for remediating mineral waste. The appropriate ratio of amendments can improve the substrate environment for plant growth and improve the repair efficiency. Study its improvement effect on tailings wasteland from the aspects of plant growth and nutritional elements. Considering that, this study explored the effects of water and fertilizer treatment on the physical and chemical properties and plant growth of quarry waste matrix with different ratios. The original soilwithout fertilizer and 45% water treatment was used as the control group (CK), and and the composite soil with different ratios of original soil and slag and various water and nitrogen fertilizer treatment combinations was used as the experimental group. Pennisetum alopecuroides (L.) Spreng, Campsis grandiflora (Thunb.) Schum, Setaria glauca (L.) Beauv, Periploca sepium Bunge and mugwort (Artemisia argyi Levl. Et Vant.)were planted in the control group and the experimental group respectively. After 30 days of nitrogen fertilizer and water treatment, an analysis was conducted to assess the physicochemical properties and the plant growth status of the tailing matrix for each experimental treatment. The results showed that the M5 treatment fostered the growth of Pennisetum alopecuroides (L.) Spreng and mugwort, while the M2 treatment promoted the growth of Campsis grandiflora (Thunb.) Schum, and the M3 treatment was beneficial to the growth of Setaria glauca (L.) Beauv and Periploca sepium Bunge. The soil matrix pH of Pennisetum alopecuroides (L.) Spreng, Campsis grandiflora (Thunb.) Schum, setaria glauca (L.) Beauv, and Periploca sepium Bunge and mugwort are all greater than 7.5, and macronutrient elements such as TK, AK, TN, AN, TP, and AP all have certain levels of improvement. PCA analysis showed that there were significant differences in substrate properties and plant growth properties between treatments for Pennisetum alopecuroides (L.) Spreng, Campsis grandiflora (Thunb.) Schum, Setaria glauca (L.) Beauv, Periploca sepium Bunge and mugwort (P<0.05). Correlation network and structural equation analysis showed that the water and fertilizer10 matrix had a significant positive correlation with soil AN and TN (P<0.05), and TK had a positive correlation with the growth status of five plants. The water and fertilizer substrate has a positive correlation with the growth status of Pennisetum alopecuroides (L.) Spreng, Setaria glauca (L.) Beauv, Periploca sepium Bunge and mugwort, and a negative correlation with the growth status of Campsis grandiflora (Thunb.) Schum.

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Steel Slag and Recycled Concrete Aggregates: Replacing Quarries to Supply Sustainable Materials for the Asphalt Paving Industry

Cited by 29 publications

References 155 publications

Utilisation of Reused Steel and Slag: Analysing the Circular Economy Benefits through Three Case Studies

Utilisation of Reused Steel and Slag: Analysing the Circular Economy Benefits through Three Case Studies

The Effect of Microwave Radiation on the Self-Healing Performance of Asphalt Mixtures with Steel Slag Aggregates and Steel Fibers

Effects of different water and fertilizer treatments on the matrix properties and plant growth of tailings waste

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